DTC Hummer P0977 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:
P0977
Definition:
HECU Fault
Description:
Enable Conditions: Case 1: The test actuates all valves in series to detect shorts or shunts between the valve lines.Faults are detected if there is an error during the test.Case 2: The drift test is executed only once during an ignition Cycle. If it detects partly shorted valve coils, almost inoperative coils or malfunction of the valve driver,a failure is recognized.
Cause:
 Faulty HECU