U0238: Lost Communication With Digital Audio Control Module D — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Lost Communication With Digital Audio Control Module D. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Network communication
Symptoms
- System warning may illuminate
- Affected feature may be unavailable
- Symptoms depend on the vehicle
Possible causes
- Module power or ground loss, connector or network wiring fault, or a module that stopped communicating
- Module power, ground, or connector fault
- Vehicle-specific mechanical or control issue
What to check
- Record all available module faults
- Scan all accessible modules and record which modules report the communication fault. Check battery voltage, module power and ground, connectors, and network wiring using the vehicle topology.
- Compare results with vehicle-specific service information
- Verify the repair
- Scan all accessible modules and record which modules report the communication fault. Check battery voltage, module power and ground, connectors, and network wiring using the vehicle topology.
- Repair the verified cause and rescan all affected modules
Also written as: U0238-00, U023800, UO238 (some scan tools add the fault-type byte, e.g. -00).