C0161ABS / Traction

ABS/TCS Brake Switch Circuit

C0161 indicates a fault in the ABS/TCS brake switch circuit. The module uses the brake switch to know when you are braking, and a fault here can disable or confuse ABS and traction control.

🚗 Yes, but ABS and traction control may behave incorrectly, so fix it soon.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty brake light switch$15-$80

40%

The brake pedal switch is misadjusted or has failed.

#2Wiring or connector fault$50-$250

25%

Broken wire or corroded connector in the switch circuit.

#3Blown brake light fuse$5-$30

20%

Loss of power to the brake switch circuit.

#4ABS module (EBCM) fault$400-$1200

15%

Internal fault reading the brake switch input.

🩺 Common Symptoms

ABS and traction control lights on
Brake lights may not work correctly
Cruise control may not disengage on braking
Traction control may act erratically

💰 Repair Cost: DIY vs Shop

DIY Cost

$15-$250

Shop Cost

$80-$400

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose C0161

1Check brake light operation and the brake light fuse

2Inspect and adjust or replace the brake light switch

3Test switch wiring and connector continuity

4Confirm the brake switch signal on a scan tool

❓ Frequently Asked Questions

Can I drive with C0161?

Yes, but brake lights, cruise, and traction control may misbehave, so fix it soon for safety.

How much to fix C0161?

A brake light switch is cheap, usually $80-$400 installed, and often just needs adjustment.

What causes C0161 most often?

A faulty or misadjusted brake light switch, or a blown brake light fuse.

🔗 Related Codes

C0110C0121C0131C0561