Technical Definition:

Malfunction Indicator Lamp (MIL) Control Circuit

Technical Description:

This diagnostic trouble code (DTC) is set when the vehicle’s Powertrain Control Module detects a fault with the Malfunction Indicator Lamp (MIL) electrical circuit.

Possible Causes:

• Burned out MIL bulb/LED
• MIL wiring problem (short or open electrical condition)
• Poor electrical connection at the bulb/cluster/PCM
• Failed/faulty PCM

Possible Symptoms:

• Malfunction indicator lamp NOT illuminating when it should (check engine light or service engine soon light)
• MIL being illuminated all the time

Malfunction Indicator Lamp Control Circuit Malfunction

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Malfunction Indicator Lamp Bulb
– Malfunction Indicator Lamp Bulb harness is open or shorted
– Malfunction Indicator Lamp Bulb circuit poor electrical connection
– Faulty Engine Control Module (ECM)

Specific Makes: