C004C
Brake Booster Motor A Position Sensor Exceeded Learning Limit
C004C is an OBD-II diagnostic trouble code meaning: Brake Booster Motor A Position Sensor Exceeded Learning Limit. Common causes: position sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $167–444.
Symptoms
- Hard brake pedal
- CHECK lamp lights up
- Reduced braking performance
- Rattling sounds from vacuum amplifier
Causes
- Position sensor malfunction
- Open or short circuit in wiring harness
- Oxidation of sensor connector contacts
- Mechanical wear of the vacuum booster
- Software failure in the brake system control unit
How to Fix
- Diagnostics of the sensor and wiring harness with a multimeter
- Checking connections for oxidation
- Replacing the position sensor if necessary
- Adaptation of a new part via a scanner
- Replacing the vacuum booster in case of mechanical damage
Related codes
Error C004C by Vehicle Brand
FAQ
What does the C004C code mean?
C004C is an OBD-II diagnostic trouble code that indicates: Brake Booster Motor A Position Sensor Exceeded Learning Limit
What causes a C004C error code?
The most common causes of C004C include: Position sensor malfunction; Open or short circuit in wiring harness; Oxidation of sensor connector contacts; Mechanical wear of the vacuum booster.
How do I fix a C004C diagnostic trouble code?
To fix C004C: Diagnostics of the sensor and wiring harness with a multimeter. Checking connections for oxidation. Replacing the position sensor if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C004C?
Limited driving only, diagnose soon
How much does it cost to fix C004C?
The estimated repair cost for C004C is $167–444. Actual cost depends on your vehicle, location, and labor rates.
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