DTC Hummer P1621 Short Explanation
Channel: Maxidot
Date: 2020-12-10

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:
P1621
Definition:
Engine Immobiliser System Malfunction
Description:
Error occurs in communication between ECM and transponder key ECU assy,and in communication line. Communication key code is different in communication with transponder key ECU.
Cause:
 Wire harness Transponder key amplifier (Transponder key amplifier) Transponder key ECU ECM