Intermittent Malfunction Indicator Light
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The following conditions may cause intermittent MIL operation with no DTCs stored:
- A defective relay, control module driven solenoid, or a switch that causes electrical system interference. Usually the symptom will occur when the faulty component is operating.
- Any Ignition Control (IC) wires routed near the generator or near secondary ignition system wires and components.
- An ignition system secondary voltage that is arcing and shorting to ground.
- Any poor ignition control circuit or ignition module grounds.
- A MIL control circuit that is intermittently shorting to ground.
- Any faulty diodes in the generator or charging system circuits.
- Improper installation of add-on electrical devices. These can include alarm systems, 2-way radios, lighting systems, electrical motors.