Keyless Entry System Fault
Issue with the keyless entry system, often related to the key fob or communication system.
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What it means (plain English)
The vehicle is not recognizing the key fob, which can prevent you from locking/unlocking or starting the car.
What the computer is actually seeing
The vehicle's control module is not receiving the correct response from the key fob when a button is pressed, possibly due to a low battery in the fob or an issue with the vehicle's receiver.
What a healthy reading looks like
The key fob signal should show a stable voltage of around 3.0V when the button is pressed, and the signal should be reliably received by the vehicle's module.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the key fob battery—replace it if the voltage is below 2.7V.
- 22. Inspect the wiring and connectors between the keyless entry module and vehicle harness for damage or corrosion.
- 33. Use a scan tool to check for additional codes related to the keyless entry system—if there are others, they may give clues to the root issue.
- 44. Test the key fob with a multimeter to verify it’s sending a signal when buttons are pressed; if not, replace the key fob.
- 55. If all else fails, check the keyless entry module for faults; test with a known good module if available.
Common causes
- Weak key fob battery
- Faulty keyless entry module
- Damaged wiring or connectors to keyless entry system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you might have difficulty locking/unlocking your car and starting it with the key fob.
Will this issue come back after fixing?
If the root cause is properly addressed (like battery replacement or fixing wiring), it should not come back.
Why does this code sometimes pair with others?
Other codes can indicate related system failures, like a wiring fault or module failure affecting the keyless entry system.
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