C0088
ChassisBrake Systemmoderate severityBrake Fluid Level Sensor Circuit
What C0088 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
Where to start: Fill brake fluid to proper level. If fluid is low, inspect for leaks at calipers, hoses, and wheel cylinders. Replace sensor if faulty.
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