C0240 C0xxx · Chassis (C) Medium severity
Traction Control Engine Torque Request Circuit
The traction control module cannot request torque reduction from the engine — a coordination fault rather than a mechanical one.
Severity guidance: Medium — drivability or emissions affected, book it in this week
Symptoms you will notice
- Wheelspin uncontrolled
- Traction lamp on
- No fault in the engine ECU
Common causes
Ordered from most to least likely — start at the top.
- 1 CAN communication fault
- 2 Engine ECU not accepting torque intervention
- 3 Coding mismatch
- 4 Software issue
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Scan all modules and look for U-codes alongside.
- ✓ Check coding and variant coding on both sides.
- ✓ Verify the engine ECU can accept a torque request (bidirectional test where supported).
- ✓ Apply outstanding software updates.
Repair options
- Repair the CAN wiring
- Correct the coding
- Update software
C0240 — frequently asked questions
Is the gearbox or engine damaged? +
No. This is purely about two modules agreeing on how to manage torque.
Will it fix itself? +
No. It needs coding or network repair.
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.