OBD-II code · Chassis
C0161 ABS/TCS Brake Switch Circuit
The ABS or traction control module has detected an implausible signal from the brake light switch. The switch tells the module whether the driver is braking and is used to inhibit traction control during braking.
Is it safe to drive with C0161?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBrake light switch failed or misadjusted
- PossibleWiring or connector fault
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 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Light Switch, ABS Control Module, Tcs Control Module
Related codes
- C0153Right Front ABS Inlet Solenoid B Circuit Malfunction
- C0156Right Front ABS Outlet Solenoid Circuit
- C0158Left Rear ABS Inlet Solenoid Circuit Malfunction
- C0163Left Rear ABS Outlet Solenoid Circuit Malfunction
- C0168Right Rear ABS Inlet Solenoid Circuit Malfunction
- C0173Right Rear ABS Outlet Solenoid Circuit Malfunction
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.