C1200 C0xxx · Chassis (C) Medium severity
ABS / Traction Control System Disabled (Torque Request Rejected)
The chassis module asked the engine ECU to reduce torque and the request was refused or timed out — usually a network or coding issue between modules.
Severity guidance: Medium — drivability or emissions affected, book it in this week
Symptoms you will notice
- Traction and stability lamps on
- Wheelspin not controlled
- No codes in the engine ECU
Common causes
Ordered from most to least likely — start at the top.
- 1 CAN communication fault between ABS and engine ECU
- 2 Coding mismatch after module replacement
- 3 Engine ECU faults preventing torque intervention
- 4 Software incompatibility
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Scan both the ABS and engine ECUs and compare their views of the torque request.
- ✓ Check coding and variant data in both modules.
- ✓ Verify CAN termination and look for accompanying U-codes.
- ✓ Check for applicable software updates.
Repair options
- Correct module coding
- Repair the CAN wiring
- Apply software updates
C1200 — frequently asked questions
Is anything physically broken? +
Usually not. This is a communication or configuration problem between two healthy modules.
Can I still drive normally? +
Yes, but wheelspin and stability intervention will not be managed. Take care in slippery conditions.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.