DTC Hummer C0550-00 Short Explanation
Channel: Maxidot Hummer
Date: 2020-06-20

The video focuses on the basic Hummer specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
HUMMER
Code:
C0550 00
Definition:
Mass Air Flow Rationality and Range Monitoring
Description:
The MAF rate into the cylinder is calculated and is dependant on the engine speed,valve-lift,the intake CMP,the exhaust CMP,and the manifold pressure.This calculated MAF rate is also corrected,which depends on the IAT,the ECT,and the manifold pressure.The ratio between the measured MAF and the calculated MAF needs to remain within adjustable minimum and maximum threshold values.When these threshold values are exceeded,a time counter is incremented.When this counter reaches its threshold value within one diagnostic cycle,a MAF meter malfunction is detected.
Cause:
 Air intake system (air filter) Faulty MAF meter signal line Faulty MAF meter Faulty IAT,ECT Faulty CMP
Failure Type:
No Sub Type Information
This sub type is used for failures where the base DTC text string provides the complete description of the failure itself (no Category and no Sub Type information used, e.g. emissions-related DTC (012700 hex): P0127 Intake Air Temperature Too High).