Control Module Performance
What it means
The engine computer (ECU) found that its internal performance is outside expected limits in one of its self-tests. The exact test differs between manufacturers, but common causes are poor power or grounds, a software issue or an internal computer fault.
Symptoms4
- Check engine light on.
- Reduced power or limp mode.
- Intermittent hesitation or stalling.
- Abnormal shifting on some vehicles.
Possible causes5
- Low battery voltage or a charging system fault.
- Poor ground connections or corroded computer connectors.
- A software issue fixed by a manufacturer update.
- Electrical interference from non-original accessories.
- Internal engine computer failure.
How to diagnose5
- Test the battery and charging system and confirm stable voltage.
- Check power and grounds at the computer and measure voltage drop on them.
- Look for non-original electrical accessories and disconnect them to test.
- Look for a service bulletin or software update for this code.
- Check the detailed code information from the dealer, since the self-test meaning varies by manufacturer.
How to fix5
- Repair a weak battery or charging system.
- Clean and tighten ground points and connectors.
- Disconnect non-original accessories causing interference.
- Update the computer software, and replace and program it if it is proven faulty.
- Clear the codes and confirm the code does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low for a power, ground or software fix, and rises if the computer must be 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 the meaning of this code vary between vehicles?
The code is generic and covers several internal self-tests, and each manufacturer decides what its computer checks, so dealer information for the vehicle is helpful.
Can the battery cause it?
Yes. Low or unstable voltage can make the computer fail its self-test, so the battery is checked first.
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What was wrong? (optional)
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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