OBD-II code · Network
U0177 Lost Communication with Mirror Memory Module
The Mirror Memory Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Memory mirror positioning stops working. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Is it safe to drive with U0177?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyMirror module unpowered
- PossibleCAN wiring to mirror module broken
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Mirror Memory Module, Can Bus Wiring
Related codes
- U0174Lost Communication With Restraints System Sensor E
- U0175Lost Communication With Restraints System Sensor F
- U0176Lost Communication With Restraints System Sensor G
- U0178Lost Communication With Restraints System Sensor I
- U0179Lost Communication with Power Liftgate Control Module
- U017ALost Communication With Restraints System Sensor K
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.