OBD-II code · Network
U020B Lost Communication With Door Control Module H
ECU lost communication with door control module H (typically passenger front door). A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Is it safe to drive with U020B?
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
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Door Module H, Can Bus
Related codes
- U0200Lost Communication With Door Control Module B
- U0201Lost Communication With Door Control Module C
- U0202Lost Communication With Door Control Module D
- U0203Lost Communication With Door Control Module E
- U0204Lost Communication With Door Control Module F
- U0205Lost Communication With Door Control Module G
- U0220Lost Communication with Door Control Module D
- U0221Lost Communication with Door Control Module E
- U0222Lost Communication with Door Control Module F
- U0208Lost Communication With Seat Control Module A
- U0209Lost Communication With Seat Control Module B
- U020ALost Communication With Moveable Roof Control Module B
- U020CLost Communication With Wireless Accessory Charging Module A
- U020DLost Communication With Wireless Accessory Charging Module B
- U0210Lost Communication With Seat Control Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.