P031F

Symptoms

• Misfire in group D cylinders
• Vibration and unstable idle
• Reduced engine power
• Increased fuel consumption
• Check Engine Light Is On or Flashing

Causes

• Short circuit of the control circuit of coil D to the +12V line
• Group D ignition coil malfunction
• Damage to the wiring or oxidation of the connector
• Defective ignition module
• ECU malfunction (rare)

How to Fix

1. Read codes, identify group D cylinders according to the engine diagram
2. Inspect the wiring and ignition coil connector D
3. Measure the resistance of the primary winding of coil D
4. Check the control voltage with an oscilloscope or multimeter
5. Swap coil D with another group to confirm the fault
6. Replace the faulty coil, if necessary, a piece of wiring

Related codes

Error P031F by Vehicle Brand