OBD-II code · Network
U0243 Lost Communication With Parking Assist Control Module B
ECU lost communication with parking assist control module B (additional ultrasonic/visual parking system).
Is it safe to drive with U0243?
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
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Parking Assist Module B, Can Bus
Related codes
- U0240Lost Communication With Entrapment Control Module B
- U0241Lost Communication With Headlamp Control Module A
- U0242Lost Communication With Headlamp Control Module B
- U0244Lost Communication With Running Board Control Module A
- U0245Lost Communication With Entertainment Control Module - Front
- U0246Lost Communication With Seat Control Module E
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.