P0650: Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
Can you still drive? Yes, but be aware that the check engine light may not warn you of other problems. Use a scan tool periodically to check for stored fault codes.
What Does P0650 Mean?
Code P0650 indicates that the PCM has detected a fault in the circuit that controls the check engine light (MIL) on the dashboard. This means the PCM cannot properly turn the MIL on or off. Ironically, this code may prevent the check engine light from illuminating even when other faults are present.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Burned-out MIL bulb in instrument cluster
- Open or shorted wiring in MIL circuit
- Faulty instrument cluster
- PCM driver circuit failure for MIL output
- Corroded connector at instrument cluster
Symptoms
- Check engine light may not illuminate when faults are present
- Check engine light stuck on permanently
- Other warning lights may be affected
- MIL does not flash during bulb check at key-on
Diagnostic Steps
- 1Verify MIL bulb is not burned out by checking during key-on bulb test
- 2Check MIL circuit wiring between PCM and instrument cluster
- 3Measure voltage at MIL circuit with PCM commanding light on and off
- 4Test instrument cluster MIL input with a test light
- 5Check PCM MIL driver output with a scan tool bidirectional test
Recommended Parts & Tools
instrument cluster bulb
OBD-II scanner
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $30 - $400 |
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Chat with AI About P0650Commonly Affected Vehicles
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Frequently Asked Questions
Why is P0650 a concern if my car runs fine?
If the MIL cannot illuminate, you will not be alerted to other potentially serious engine or emissions faults. You could have critical issues without any dashboard warning.
Will P0650 cause an emissions test failure?
Yes, most emissions inspections include a check that the MIL illuminates during the bulb test. A non-functional MIL will fail this portion of the test.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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