OBD-II code · Network
U0238 Lost Communication With Digital Audio Control Module D
ECU lost communication with digital audio control module D (amp or zone audio controller). 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 U0238?
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
- Audio Module D, Can Bus
Related codes
- U0235Lost Communication with Cruise Control Front Distance Range Sensor
- U0236Lost Communication with Steering Angle Sensor Module
- U0237Lost Communication with Sunroof Assembly Control Module
- U0239Lost Communication With Entrapment Control Module A
- U023ALost Communication With Image Processing Module A
- U023BLost Communication With Image Processing Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.