P0650

Malfunction Indicator Lamp (MIL) Control Circuit

Car Fault Codes Engine computer & electrical

Can you still drive? Yes, normally

Who can fix it? Needs a workshop

Typical repair time 30 minutes – 3 hours

Typical cost SAR 100 to 1,500

What it means

The engine computer (ECU) controls the check engine lamp (MIL) in the instrument cluster. The computer found that the lamp control circuit does not match its commands, so the lamp may not light when there is a fault, or may stay on for no reason.

Symptoms4

Check engine light does not come on when the key is switched on.
Check engine light stays on or flashes for no clear reason.
Stored codes found on a scan tool even though the lamp is off.
Failed emissions test because the lamp does not work.

Possible causes5

Failed bulb or lamp in the instrument cluster on older vehicles.
Broken or corroded wiring between the computer and the instrument cluster.
Fault in the instrument cluster itself.
Poor power or ground to the instrument cluster.
Faulty control circuit inside the engine computer (rare).

How to diagnose5

Switch the key on without starting and confirm the lamp lights for a few seconds as a bulb check.
Use the scan tool to command the lamp on if the function is available.
Check the other cluster warning lamps to see whether the whole cluster is affected.
Inspect wiring and connectors between the computer and the cluster, or the network messages on vehicles that send the command over the CAN bus.
Check power and ground to the instrument cluster.

How to fix5

Replace a failed bulb or lamp if it is separate.
Repair the broken wire or corroded connector.
Repair the power or ground to the instrument cluster.
Repair or replace the instrument cluster if proven faulty.
Clear the codes and confirm the lamp lights with the key on and goes out after starting.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a bulb or wire repair, and rises if the instrument cluster must be repaired or replaced.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Why does fixing the check engine lamp matter?

It is the only warning of engine and emissions faults, and if it does not work, a serious problem can continue without you noticing.

Does this code affect engine performance?

No. It concerns only the lamp circuit and does not affect how the engine runs, but it can cause a failed emissions test.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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