OBD-II code · Chassis
C0402 Traction Control Lamp Circuit
The TCS indicator lamp control circuit is shorted or open.
Is it safe to drive with C0402?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- PossibleIndicator bulb/LED failed
- PossibleWiring shorted
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcs Indicator Lamp, Instrument Cluster
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.