C0088moderate severityChassis
Brake Fluid Level Sensor Circuit
on 2016 Cadillac ATS 2.5L I4 · RWD
What this code means
Malfunction in the brake fluid level sensor circuit in the master cylinder reservoir.
Symptoms
- Brake warning light on
- Low brake fluid warning
- ABS may be disabled
- Stability control may be disabled
Common causes
- Low brake fluid level
- Faulty float sensor in reservoir
- Wiring to sensor damaged
- Sensor connector corroded
Diagnostic steps
- Check brake fluid level first
- Inspect sensor connector
- Test sensor circuit continuity
- Add brake fluid and verify warning clears
- Check for brake fluid leaks
Repair notes
Fill brake fluid to proper level. If fluid is low, inspect for leaks at calipers, hoses, and wheel cylinders. Replace sensor if faulty.
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