P1C12
Vacuum Pump Relay Stuck Closed
P1C12 is an OBD-II diagnostic trouble code meaning: Vacuum Pump Relay Stuck Closed. Common causes: faulty vacuum pump relay, short circuit in relay control circuit. Estimated repair cost: $6–28.
Symptoms
- Humming sound from vacuum pump
- Reduced braking system efficiency
- Increased fuel consumption
- Check Engine Light Is On
- Vacuum pump overheating
Causes
- Faulty vacuum pump relay
- Short circuit in relay control circuit
- Problems with the engine control unit
- Mechanical stuck relay
- Damaged wiring harness to relay
How to Fix
- Check vacuum pump relay
- Check relay control circuit for short circuit
- Inspect the wiring harness for damage
- Replace faulty relay
- Check the operation of the vacuum pump after repair
Related codes
FAQ
What does the P1C12 code mean?
P1C12 is an OBD-II diagnostic trouble code that indicates: Vacuum Pump Relay Stuck Closed
What causes a P1C12 error code?
The most common causes of P1C12 include: Faulty vacuum pump relay; Short circuit in relay control circuit; Problems with the engine control unit; Mechanical stuck relay.
How do I fix a P1C12 diagnostic trouble code?
To fix P1C12: Check vacuum pump relay. Check relay control circuit for short circuit. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1C12?
Limited driving only, diagnose soon
How much does it cost to fix P1C12?
The estimated repair cost for P1C12 is $6–28. Actual cost depends on your vehicle, location, and labor rates.
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