DTC Hummer B1004 Short Explanation
Channel: Maxidot
Date: 2020-10-18

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:
B1004
Definition:
Rocker Arm Oil Pressure Switch (VTEC Oil Pressure Switch) Circuit Low Voltage
Description:
With the engine running,engine speed a minimum of 4,800 rpm (Variable that is depending on the engine load).The rocker arm oil control solenoid is ON,the rocker arm oil pressure switch remains ON.The execution time is once per driving cycle and DTCs P2648, P2649 are not active.NOTE: Before you troubleshoot,record all freeze data and any on-board snapshot.
Cause:
 Low engine oil or faulty oil pressure Poor connections or loose terminals at the rocker arm oil pressure switch,the rocker arm oil control solenoid,and the PCM "Short" circuit between the PCM and the rocker arm oil pressure switch Faulty rocker arm oil pressure switch Faulty rocker arm oil control solenoid Faulty rocker arm