P0650 means Malfunction Indicator Lamp (MIL) Control Circuit. The computer has detected a fault in the circuit that turns on the check engine light. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0650 means
Modern vehicles have many control modules that share information over a network, usually called the CAN bus. Codes starting with U mean a module has stopped hearing another one, and voltage and processor codes mean a module is not getting clean power or has an internal fault. Low battery voltage, poor grounds, blown fuses and damaged wiring cause many of these codes, so test the battery and charging system first.
P0650 symptoms
- Check engine light that never lights or stays on
- No visible warning for other faults
- Code found during a scan
Common causes of P0650
- Failed bulb or LED in the cluster on some vehicles
- Wiring fault in the lamp circuit
- Instrument cluster fault
How to diagnose P0650
- Check whether the light comes on during the key-on bulb check
- Inspect the lamp circuit
- Scan for other codes the light may be hiding
Can you drive with P0650?
Yes, but scan regularly because other faults will not show.
P0650 tips
When the check engine light circuit fails, other faults go unnoticed. Scan the vehicle regularly until the light works again.
Will P0650 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0650 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0606 | Control Module Processor |
| P0600 | Serial Communication Link |
| U0100 | Lost Communication With ECM/PCM A |
Guides that help
When it is more than a sensor
Voltage and network codes come from wiring, the battery, the charging system or a module, not from engine or transmission wear. If a lost-communication code has left the transmission in limp mode, rule out the module and wiring before deciding the unit has failed, and see our transmissions only if testing confirms internal damage.
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