C0110moderate severityChassis
Brake Apply Circuit
on 2021 Audi S5 3.0L Turbo V6 · AWD
What this code means
The ABS/stability control module detects a general fault in the brake apply sensing circuit.
Symptoms
- ABS light on
- Cruise control not working
- Shift lock may not release
- Stability control disabled
Common causes
- Brake light switch failure
- Brake pedal position sensor fault
- Wiring issue in brake apply circuit
- ABS module input failure
Diagnostic steps
- Test brake light switch
- Test brake pedal position sensor
- Check brake light fuse
- Inspect wiring between switch and ABS module
- Verify both brake switch inputs
Repair notes
Replace brake light switch or repair wiring in brake apply circuit.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic