P031A

Ignition C Control Signal Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Misfires
Unstable engine operation
Power reduction
Increased fuel consumption

Causes

Open or short circuit in wiring harness
Faulty ignition coil
Problems with the engine control unit (ECU)
Poor contact in connectors

How to Fix

Check the integrity of the wiring harness
Check the condition of the ignition coil
Check connectors and contacts
Test the engine control unit (ECU)

Related codes

P0300 P0301 P0302 P0303