OBD-II code · Network
U020A Lost Communication With Moveable Roof Control Module B
Lost Communication With Moveable Roof Control Module B: the control module has detected this fault condition.
Is it safe to drive with U020A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 0.5–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Moveable Roof Module B, Can Bus
Related codes
- U0207Lost Communication With Moveable Roof Control Module A
- U0208Lost Communication With Seat Control Module A
- U0209Lost Communication With Seat Control Module B
- U020BLost Communication With Door Control Module H
- U020CLost Communication With Wireless Accessory Charging Module A
- U020DLost Communication With Wireless Accessory Charging Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.