P068C
Cylinder 7 Glow Plug Control Circuit Low
P068C is an OBD-II diagnostic trouble code meaning: Cylinder 7 Glow Plug Control Circuit Low. Common causes: control wire short circuit to ground, broken or damaged wiring. Estimated repair cost: $17–278.
Symptoms
- Difficulty starting a diesel engine at low temperatures
- Check Engine Light
- White smoke on cold start
- Unstable engine operation
- The glow plug indicator is on
Causes
- Control wire short circuit to ground
- Broken or damaged wiring
- GPCM module malfunction
- Faulty glow plug for cylinder 7
- Oxidation of control circuit connectors
How to Fix
- Read OBD-II codes
- Inspect the wiring and connectors of cylinder 7 spark plug and GPCM
- Measure the voltage in the spark plug control circuit
- Check the spark plug resistance (normal: 0.5–2 Ohm)
- Check the circuit for short to ground
- If the wiring is working properly, diagnose and replace the GPCM
Related codes
Error P068C by Vehicle Brand
FAQ
What does the P068C code mean?
P068C is an OBD-II diagnostic trouble code that indicates: Cylinder 7 Glow Plug Control Circuit Low
What causes a P068C error code?
The most common causes of P068C include: Control wire short circuit to ground; Broken or damaged wiring; GPCM module malfunction; Faulty glow plug for cylinder 7.
How do I fix a P068C diagnostic trouble code?
To fix P068C: Read OBD-II codes. Inspect the wiring and connectors of cylinder 7 spark plug and GPCM. Measure the voltage in the spark plug control circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P068C?
Yes, but get it checked soon
How much does it cost to fix P068C?
The estimated repair cost for P068C is $17–278. Actual cost depends on your vehicle, location, and labor rates.
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