Remote Keyless Entry Receiver Circuit Malfunction
What does B1118 mean?
The B1118 code means the vehicle's onboard diagnostic system has detected: Remote Keyless Entry Receiver Circuit Malfunction. This is a low severity code.
Common Symptoms
- Key fob does not lock or unlock vehicle
- Reduced key fob range
- Key fob works only when very close to vehicle
- Keyless entry works intermittently
- Multiple key fobs stop working simultaneously
Probable Causes (Ranked by Likelihood)
- Failed keyless entry receiver module Very High
- Damaged receiver antenna High
- Electrical interference near receiver Moderate
- Wiring fault to receiver module Low
Step-by-Step Diagnostic Procedure
-
Test multiple key fobs to rule out fob battery issue
-
Scan BCM for keyless entry DTCs
-
Check receiver module power and ground
-
Inspect receiver antenna for damage or disconnection
-
Check for aftermarket devices causing RF interference
Frequently Asked Questions
How do I know if it is the fob or the receiver?
If multiple key fobs all stop working at the same time, the vehicle receiver is likely the issue. If only one fob fails, it is probably a dead battery or failed fob.
Can aftermarket accessories interfere with keyless entry?
Yes. Aftermarket alarm systems, LED lighting, dash cameras, or other electronics can produce radio frequency interference that disrupts the keyless entry receiver signal.
Where is the keyless entry receiver located?
The receiver module is typically located behind the dashboard, in the trunk area, or behind a trim panel. Its antenna may be a separate wire routed along the vehicle body.