Exhibit 33.1

Managements Report on Assessment of

Compliance with SEC Regulation AB Servicing Criteria

Mechanics Bank (the Asserting Party) is responsible for assessing compliance as of and for the year ended December 31, 2018 (the
Reporting Period) with the servicing criteria set forth in Title 17, Section 229.1122(d) of the Code of Federal Regulations (the CFR), except for the criteria set forth in Appendix A which the Asserting Party has
concluded are not applicable to the servicing of the California Republic Auto Receivables Trust asset-backed securitization transactions backed by auto receivables and serviced by the Asserting Party (the Applicable Servicing Criteria).

The Asserting Party has assessed its compliance with the Applicable Servicing Criteria for the Reporting Period and based on such assessment the
Asserting Party has complied, in all material respects, with the applicable Servicing Criteria for the securitization transactions backed by auto receivables serviced by the Asserting Party as set forth in Appendix B.

Crowe LLP, an independent registered public accounting firm, has issued an attestation report on the assessment of the compliance with the Applicable
Servicing Criteria as set forth in this assertion.

Mechanics Bank

/s/ Nathan J. Duda

Nathan J. Duda

EVP, Chief Financial Officer

Date: March 26, 2019



---

APPENDIX A



|                   |  |                                                                                                                                                                                                                                                                                                                                                                                 |  |                                      |  |                                                                         |  |  
|------------------ |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------ |  | ----------------------------------------------------------------------- |  | -
|SERVICING CRITERIA |  | APPLICABLE
SERVICING
CRITERIA                                                                                                                                                                                                                                                                                                                                                   |  | INAPPLICABLESERVICINGCRITERIA       
|Reference          |  | Criteria                                                                                                                                                                                                                                                                                                                                                                        |  | Performed Directly
byAsserting
Party |  | Performed by Vendor(s)
for WhichAsserting
Party is theResponsible
Party |  |  
|                   |  | General Servicing Considerations                                                                                                                                                                                                                                                                                                                                                |  |                                      |  |                                                                         |  |  
|1122(d)(1)(i)      |  | Policies and procedures are instituted to monitor any performance or other triggers and events of default in accordance with the transaction
agreements.                                                                                                                                                                                                                        |  | X                                    |  |                                                                         |  |  
|1122(d)(1)(ii)     |  | If any material servicing activities are outsourced to third parties, policies and procedures are instituted to monitor the third partys
performance and compliance with such servicing activities.                                                                                                                                                                            |  | X                                    |  |                                                                         |  |  
|1122(d)(1)(iii)    |  | Any requirements in the transaction agreements to maintain a back-up servicer for the pool assets are
maintained.                                                                                                                                                                                                                                                               |  | X                                    |  |                                                                         |  |  
|1122(d)(1)(iv)     |  | A fidelity bond and errors and omissions policy is in effect on the party participating in the servicing function throughout the reporting period in
the amount of coverage required by and otherwise in accordance with the terms of the transaction agreements.                                                                                                               |  | X                                    |  |                                                                         |  |  
|1122(d)(1)(v)      |  | Aggregation of information, as applicable, is mathematically accurate and the information conveyed accurately reflects the information.                                                                                                                                                                                                                                         |  | X                                    |  |                                                                         |  |  
|                   |  | Cash Collection and Administration                                                                                                                                                                                                                                                                                                                                              |  |                                      |  |                                                                         |  |  
|1122(d)(2)(i)      |  | Payments on pool assets are deposited into the appropriate custodial bank accounts and related bank clearing accounts no more than two business days of
receipt, or such other number of days specified in the transaction agreements.                                                                                                                                          |  | X                                    |  |                                                                         |  |  
|1122(d)(2)(ii)     |  | Disbursements made via wire transfer on behalf of an obligor or to an investor are made only by authorized personnel.                                                                                                                                                                                                                                                           |  | X                                    |  |                                                                         |  |  
|1122(d)(2)(iii)    |  | Advances of funds or guarantees regarding collections, cash flows or distributions, and any interest or other fees charged for such advances, are made,
reviewed and approved as specified in the transaction agreements.                                                                                                                                                       |  | X                                    |  |                                                                         |  |  
|1122(d)(2)(iv)     |  | The related accounts for the transaction, such as cash reserve accounts or accounts established as a form of overcollateralization, are separately
maintained (e.g., with respect to commingling of cash) as set forth in the transaction agreements.                                                                                                                           |  |                                      |  |                                                                         |  | X
|1122(d)(2)(v)      |  | Each custodial account is maintained at a federally insured depository institution as set forth in the transaction agreements. For purposes of this
criterion, federally insured depository institution with respect to a foreign financial institution means a foreign financial institution that meets the requirements of Rule 13k-1(b)(1) of the Securities Exchange Act. |  | X                                    |  |                                                                         |  |  



---

|                   |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |  |                                      |  |                                                                         |  |  
|------------------ |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------ |  | ----------------------------------------------------------------------- |  | -
|SERVICING CRITERIA |  | APPLICABLE
SERVICING
CRITERIA                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |  | INAPPLICABLESERVICINGCRITERIA       
|Reference          |  | Criteria                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |  | Performed Directly
byAsserting
Party |  | Performed by Vendor(s)
for WhichAsserting
Party is theResponsible
Party |  |  
|1122(d)(2)(vi)     |  | Unissued checks are safeguarded so as to prevent unauthorized access.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |  |                                      |  |                                                                         |  | X
|1122(d)(2)(vii)    |  | Reconciliations are prepared on a monthly basis for all asset-backed securities related bank accounts, including custodial accounts and related bank
clearing accounts. These reconciliations are (A) mathematically accurate; (B) prepared within 30 calendar days after the bank statement cutoff date, or such other number of days specified in the transaction agreements; (C) reviewed
and approved by someone other than the person who prepared the reconciliation; and (D) contain explanations for reconciling items. These reconciling items are resolved within 90 calendar days of their original identification, or such other
number of days specified in the transaction agreements. |  | X                                    |  |                                                                         |  |  
|                   |  | Investor Remittances and Reporting                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |  |                                      |  |                                                                         |  |  
|1122(d)(3)(i)      |  | Reports to investors, including those to be filed with the Commission, are maintained in accordance with the transaction agreements and applicable
Commission requirements. Specifically, such reports (A) are prepared in accordance with timeframes and other terms set forth in the transaction agreements; (B) provide information calculated in accordance with the terms specified in the
transaction agreements; (C) are filed with the Commission as required by its rules and regulations; and (D) agree with investors or the trustees records as to the total unpaid principal balance and number of pool assets
serviced by the Servicer.                                              |  | X                                    |  |                                                                         |  |  
|1122(d)(3)(ii)     |  | Amounts due to investors are allocated and remitted in accordance with timeframes, distribution priority and other terms set forth in the transaction
agreements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |  |                                      |  |                                                                         |  | X
|1122(d)(3)(iii)    |  | Disbursements made to an investor are posted within two business days to the Servicers investor records, or such other number of days specified
in the transaction agreements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |  |                                      |  |                                                                         |  | X
|1122(d)(3)(iv)     |  | Amounts remitted to investors per the investor reports agree with cancelled checks, or other form of payment, or custodial bank statements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |  |                                      |  |                                                                         |  | X



---

|                   |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |  |                                      |  |                                                                         |  | 
|------------------ |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------ |  | ----------------------------------------------------------------------- |  | 
|SERVICING CRITERIA |  | APPLICABLE
SERVICING
CRITERIA                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |  | INAPPLICABLESERVICINGCRITERIA       
|Reference          |  | Criteria                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  | Performed Directly
byAsserting
Party |  | Performed by Vendor(s)
for WhichAsserting
Party is theResponsible
Party |  | 
|                   |  | Pool Asset Administration                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |  |                                      |  |                                                                         |  | 
|1122(d)(4)(i)      |  | Collateral or security on pool assets is maintained as required by the transaction agreements or related pool asset documents.                                                                                                                                                                                                                                                                                                                                                                                 |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(ii)     |  | Pool assets and related documents are safeguarded as required by the transaction agreements.                                                                                                                                                                                                                                                                                                                                                                                                                   |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(iii)    |  | Any additions, removals or substitutions to the asset pool are made, reviewed and approved in accordance with any conditions or requirements in the
transaction agreements.                                                                                                                                                                                                                                                                                                                                    |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(iv)     |  | Payments on pool assets, including any payoffs, made in accordance with the related pool asset documents are posted to the applicable servicers
obligor records maintained no more than two business days after receipt, or such other number of days specified in the transaction agreements, and allocated to principal, interest or other items (e.g., escrow) in accordance with the related pool
asset documents.                                                                                        |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(v)      |  | The Servicers records regarding the pool assets agree with the Servicers records with respect to an obligors unpaid principal
balance.                                                                                                                                                                                                                                                                                                                                                                      |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(vi)     |  | Changes with respect to the terms or status of an obligors pool asset (e.g., loan modifications or re-agings) are made, reviewed and approved by
authorized personnel in accordance with the transaction agreements and related pool asset documents.                                                                                                                                                                                                                                                         |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(vii)    |  | Loss mitigation or recovery actions (e.g., forbearance plans, modifications and deeds in lieu of foreclosure, foreclosures and repossessions, as
applicable) are initiated, conducted and concluded in accordance with the timeframes or other requirements established by the transaction agreements.                                                                                                                                                                                                         |  | X                                    |  |                                                                         |  | 
|1122(d)(4)(viii)   |  | Records documenting collection efforts are maintained during the period a pool asset is delinquent in accordance with the transaction agreements. Such
records are maintained on at least a monthly basis, or such other period specified in the transaction agreements, and describe the entitys activities in monitoring delinquent pool assets including, for example, phone calls, letters and payment
rescheduling plans in cases where delinquency is deemed temporary (e.g., illness or unemployment). |  | X                                    |  |                                                                         |  | 



---

|                   |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |                                      |  |                                                                         |  |  
|------------------ |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------ |  | ----------------------------------------------------------------------- |  | -
|SERVICING CRITERIA |  | APPLICABLE
SERVICING
CRITERIA                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |  | INAPPLICABLESERVICINGCRITERIA       
|Reference          |  | Criteria                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |  | Performed Directly
byAsserting
Party |  | Performed by Vendor(s)
for WhichAsserting
Party is theResponsible
Party |  |  
|1122(d)(4)(ix)     |  | Adjustments to interest rates or rates of return for pool assets with variable rates are computed based on the related receivables documents.                                                                                                                                                                                                                                                                                                                                                                                                                                         |  |                                      |  |                                                                         |  | X
|1122(d)(4)(x)      |  | Regarding any funds held in trust for an obligor (such as escrow accounts): (A) such funds are analyzed, in accordance with the obligors pool
assets documents, on at least an annual basis, or such other period specified in the transaction agreements; (B) interest on such funds is paid, or credited, to obligors in accordance with applicable pool asset documents and state laws; and
(C) such funds are returned to the obligor within 30 calendar days of full repayment of the related pool asset, or such other number of days specified in the transaction agreements. |  |                                      |  |                                                                         |  | X
|1122(d)(4)(xi)     |  | Payments made on behalf of an obligor (such as tax or insurance payments) are made on or before the related penalty or expiration dates, as indicated
on the appropriate bills or notices for such payments, provided that such support has been received by the servicer at least 30 calendar days prior to these dates, or such other number of days specified in the transaction agreements.                                                                                                                                                                                       |  |                                      |  |                                                                         |  | X
|1122(d)(4)(xii)    |  | Any late payment penalties in connection with any payment to be made on behalf of an obligor are paid from the servicers funds and not charged to
the obligor, unless the late payment was due to the obligors error or omission.                                                                                                                                                                                                                                                                                                                                                   |  |                                      |  |                                                                         |  | X
|1122(d)(4)(xiii)   |  | Disbursements made on behalf of an obligor are posted within two business days to the obligors records maintained by the servicer, or such other
number of days specified in the transaction agreements.                                                                                                                                                                                                                                                                                                                                                                             |  |                                      |  |                                                                         |  | X
|1122(d)(4)(xiv)    |  | Delinquencies, charge-offs and uncollectible accounts are recognized and recorded in accordance with the transaction agreements.                                                                                                                                                                                                                                                                                                                                                                                                                                                      |  | X                                    |  |                                                                         |  |  
|1122(d)(4)(xv)     |  | Any external enhancement or other support, identified in Item 1114(a)(1) through (3) or Item 1115 of Regulation AB, is maintained as set forth in
the transaction agreements.                                                                                                                                                                                                                                                                                                                                                                                                         |  |                                      |  |                                                                         |  | X



---

APPENDIX B

California Republic Auto Receivables Trust 2014-4

California Republic Auto Receivables Trust 2015-1

California Republic Auto Receivables Trust 2015-2

California Republic Auto Receivables Trust 2015-3

California Republic Auto Receivables Trust 2015-4

California Republic Auto Receivables Trust 2016-1

California Republic Auto Receivables Trust 2016-2

California Republic Auto Receivables Trust 2017-1

California Republic Auto Receivables Trust 2018-1