B3891

Trailer Fog Lamps Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$11–56 (est.)

Symptoms

Trailer fog lights do not work
Trailer fog lights flashing
The malfunction indicator on the dashboard lights up

Causes

Open or short circuit in wiring harness
Fuse or relay failure
Problems with the trailer lights themselves
Control unit malfunction

How to Fix

Check fuses and relays associated with trailer fog lights
Inspect the wiring harness for damage
Check the operation of the trailer fog lights
If necessary, replace faulty components
Reset the error and check if it returns

Related codes

B3890 B3892 B3893