Remote Keyless Entry System Fault
Indicates a fault in the remote keyless entry system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The vehicle's computer isn't getting the signal it expects from the key fob, or there's an issue in communication between the fob and the vehicle.
What the computer is actually seeing
The Body Control Module (BCM) expects a consistent signal voltage from the key fob when a button is pressed, typically around 3.0-3.3 volts. If this signal is missing or fails to meet the expected pattern, the code sets.
What a healthy reading looks like
Normal operation should show a 3.0-3.3 volt signal from the key fob during button presses and a consistent response from the BCM in under 100 milliseconds.
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.
- 1Check key fob battery voltage; should be 3.0 volts or more. If low, replace battery and retest.
- 2Inspect all connectors and wiring to the Body Control Module for damage or corrosion.
- 3Use a scan tool to verify communication from the key fob to the BCM; if no signal, try a different key fob if available.
Common causes
- Weak or dead key fob battery
- Faulty key fob
- Issues with the Body Control Module
- Wiring problems between the key fob and BCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, the vehicle is drivable but you may experience issues starting it without the key fob.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely reappear after clearing.
Why does this code appear with others like B1564?
These codes are often related as they all pertain to keyless entry system malfunctions.
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