P031C
Ignition C Control Signal Circuit High
P031C is an OBD-II diagnostic trouble code meaning: Ignition C Control Signal Circuit High. Common causes: short circuit in the ignition coil control circuit c to +12v, group c ignition coil malfunction. Estimated repair cost: $33–133.
Symptoms
- Misfires in group C cylinders
- Unstable idle, vibration
- Loss of engine power
- Increased fuel consumption
- Check Engine Light Is On, Possibly Flashing
Causes
- Short circuit in the ignition coil control circuit C to +12V
- Group C ignition coil malfunction
- Damage to wiring or coil connector
- Malfunction of the ignition control module
- ECU malfunction (rare)
How to Fix
- Read error codes, determine which cylinders are in group C
- Inspect the connector and wiring of ignition coil C for damage.
- Measure the resistance of the primary winding of the coil (standard: 0.5–2 Ohm)
- Check the control circuit voltage with the ignition on
- Move coil C to another group and check if the error moves
- Replace the faulty ignition coil
Related codes
Error P031C by Vehicle Brand
FAQ
What does the P031C code mean?
P031C is an OBD-II diagnostic trouble code that indicates: Ignition C Control Signal Circuit High
What causes a P031C error code?
The most common causes of P031C include: Short circuit in the ignition coil control circuit C to +12V; Group C ignition coil malfunction; Damage to wiring or coil connector; Malfunction of the ignition control module.
How do I fix a P031C diagnostic trouble code?
To fix P031C: Read error codes, determine which cylinders are in group C. Inspect the connector and wiring of ignition coil C for damage.. Measure the resistance of the primary winding of the coil (standard: 0.5–2 Ohm). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P031C?
Do not drive — repair immediately
How much does it cost to fix P031C?
The estimated repair cost for P031C is $33–133. Actual cost depends on your vehicle, location, and labor rates.
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