OBD-II code · Chassis
C0401 Traction Control Switch Circuit
The TCS on/off switch reports an implausible state.
Is it safe to drive with C0401?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySwitch 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
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcs Switch, Dashboard Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.