P031D

Ignition D Control Signal Circuit/Open

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$33–167 (est.)

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

P031C P031E P031F P030D