Traction Control Torque Request Circuit
The C0235 code means the vehicle's onboard diagnostic system has detected: Traction Control Torque Request Circuit. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $100 - $800 (parts and labor)
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Common Symptoms
- Traction control light on
- Engine does not reduce power when wheels spin
- Check engine light may also be on
- Stability control disabled
- Reduced engine performance in some driving modes
Probable Causes (Ranked by Likelihood)
- Communication fault between traction control and engine module Very High
- CAN bus wiring issue between modules High
- Engine control module not responding to torque reduction requests Moderate
- Traction control module software error Moderate
- Throttle body or electronic throttle control issue Low
Step-by-Step Diagnostic Procedure
-
Scan both the ABS/TC module and engine module for DTCs
-
Check CAN bus communication between modules using a scan tool
-
Verify the electronic throttle control system is functioning properly
-
Inspect CAN bus wiring between the ABS module and ECM for damage
-
Check for software updates or TSBs related to torque management
Frequently Asked Questions
How does traction control reduce engine power?
The traction control module communicates with the engine control module via the CAN bus network to request a reduction in engine torque. This can be done by retarding ignition timing, reducing fuel injection, or partially closing the electronic throttle.
Can a CAN bus problem cause C0235?
Yes. The traction control and engine modules communicate through the CAN bus. Damaged wiring, corroded connectors, or faulty terminating resistors in the CAN bus can prevent proper communication.
Will the traction control still use brakes if torque request fails?
Most systems will still apply individual wheel brakes to control wheel spin. However, without the ability to reduce engine torque, the system is less effective and may not prevent wheel spin as well.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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