P031D
Ignition D Control Signal Circuit/Open
P031D is an OBD-II diagnostic trouble code meaning: Ignition D Control Signal Circuit/Open. Common causes: open or short circuit in the ignition coil wiring harness, faulty ignition coil. Estimated repair cost: $33–167.
Symptoms
- Misfire in cylinder D
- Unstable engine operation
- Power reduction
- Increased fuel consumption
- Check Engine Light Illuminates
Causes
- Open or short circuit in the ignition coil wiring harness
- Faulty ignition coil
- Poor contact in the ignition coil connector
- Engine control unit (ECU) malfunction
- Corroded or damaged contacts
How to Fix
- Visual inspection of the wiring harness and ignition coil connectors
- Checking the ignition coil resistance
- Checking the presence of a control signal from the ECU
- Checking the ignition coil power supply
- Replacing a faulty ignition coil if necessary
- Repair or replacement of damaged wires
- Cleaning connector contacts
- Checking for ECU Software Updates
Related codes
Error P031D by Vehicle Brand
FAQ
What does the P031D code mean?
P031D is an OBD-II diagnostic trouble code that indicates: Ignition D Control Signal Circuit/Open
What causes a P031D error code?
The most common causes of P031D include: Open or short circuit in the ignition coil wiring harness; Faulty ignition coil; Poor contact in the ignition coil connector; Engine control unit (ECU) malfunction.
How do I fix a P031D diagnostic trouble code?
To fix P031D: Visual inspection of the wiring harness and ignition coil connectors. Checking the ignition coil resistance. Checking the presence of a control signal from the ECU. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P031D?
Do not drive — repair immediately
How much does it cost to fix P031D?
The estimated repair cost for P031D is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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