Intermittent Malfunction Indicator Lamp (MIL)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The following can cause an intermittent MIL and no DTCs:
- Electrical system interference caused by a malfunctioning relay, ECM driven solenoid, or switch. The electrical component can cause a sharp electrical surge. Normally, the problem will occur when the malfunctioning component is operating.
- The improper installation of electrical devices; such as lights, 2-way radios, electric motors, etc.
- The MIL circuit intermittently shorted to ground.
- Poor ECM grounds