Code result
C0161
ABS/TCS Brake Switch Circuit Malfunction
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Brake light switch failed or misadjusted
highOne of the most commonly reported causes for this code — check this first.
Wiring or connector fault
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose C0161 freeNo credit card required