Power Mirror Control Circuit Malfunction
What does B1308 mean?
The B1308 code means the vehicle's onboard diagnostic system has detected: Power Mirror Control Circuit Malfunction. This is a low severity code.
Common Symptoms
- Power mirrors not adjusting
- One mirror moves but the other does not
- Mirror adjustment switch unresponsive
- Mirror folds but does not tilt
- Power folding mirrors stuck open or closed
Probable Causes (Ranked by Likelihood)
- Failed mirror adjustment motor inside mirror Very High
- Faulty mirror control switch High
- Damaged wiring in door to mirror area Moderate
- Blown mirror circuit fuse Moderate
- BCM mirror control output fault Low
Step-by-Step Diagnostic Procedure
-
Check mirror fuse
-
Test mirror switch with scan tool or multimeter
-
Test both mirrors from the selector switch
-
Apply direct power to mirror motor at connector
-
Inspect wiring from door to mirror for damage
Frequently Asked Questions
Can I still adjust the mirror manually?
Some power mirrors can be gently pushed by hand to adjust position, but this varies by vehicle. Be careful not to force the mirror or damage the internal motor gears.
Why does one mirror work but not the other?
The mirror control switch has a selector to choose left or right mirror. If one works and the other does not, the issue is usually the specific mirror's motor or its wiring.
Are power folding mirror motors separate from adjustment motors?
Yes. Power folding mirrors have two separate motors -- one for adjusting the mirror angle and one for folding the mirror housing. Either can fail independently.