Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Hummer H2FACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake DTCS
ANTI-LOCK BRAKE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B3626 | Traction Control Switch Circuit Fault |
| DTC C0035 | Left Front Wheel Speed Circuit Malfunction |
| DTC C0036 | LF Wheel Speed Circuit Range/Performance |
| DTC C0040 | Right Front Wheel Speed Circuit Malfunction |
| DTC C0041 | Right Front Wheel Speed Sensor Circuit Range/Performance (EBCM) |
| DTC C0045 | Left Rear Wheel Speed Circuit Malfunction |
| DTC C0046 | Left Rear Wheel Speed Sensor Circuit Range/Performance (EBCM) |
| DTC C0050 | Right Rear Wheel Speed Circuit Malfunction |
| DTC C0051 | LF Wheel Speed Sensor Circuit Range/Performance (EBCM) |
| DTC C0110 | Pump Motor Circuit Malfunction |
| DTC C0121 | Valve Relay Circuit Malfunction |
| DTC C0161 | ABS/TCS Brake Switch Circuit Malfunction |
| DTC C0191 | Longitudinal Accelerometer Circuit Fault |
| DTC C0192 | Longitudinal Accelerometer Circuit Fault |
| DTC C0245 | Wheel Speed Sensor Frequency Error |
| DTC C0267 | Pump Motor Circuit Open/Shorted |
| DTC C0550 | ECU Malfunction - internal write / checksum malfunction |
| DTC C0896 | Electronic Suspension Control (ESC) voltage is outside the normal range of 9 to 15.5 volts |
| DTC U1000 | Class 2 Communication Malfunction |
| DTC U1255 | Class 2 Communication Malfunction |
| DTC U1300 | Class 2 Short to Ground |
| DTC U1301 | Class 2 Short to Battery |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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