Cold Start Fuel Injection Control Circuit High

Common symptoms

What you'll notice

• Check and replace the faulty cold start fuel injector
• Inspect and repair any damaged or loose wiring connected to the cold start fuel injection circuit
• Clean or replace the mass air flow sensor (MAF)
• Inspect and clean the intake air temperature (IAT) sensor
• Check and replace the engine control module (ECM) if necessary

Common causes

Most likely first

1. Faulty cold start fuel injector
2. Faulty engine coolant temperature sensor
3. Faulty intake air temperature sensor
4. Faulty engine control module (ECM)
5. Faulty wiring or connectors in the cold start fuel injection control circuit

How to diagnose & fix

Work through it in order

1. Engine struggles to start or fails to start on cold starts
2. Poor engine performance during cold starts
3. Increased fuel consumption during cold starts
4. Engine misfires or stumbles during cold starts
5. Check Engine Light illuminates during cold starts