OBD-II code · Network
U031B Software Incompatibility With DC/DC Converter Control Module A
A module reports a software version mismatch with DC/DC converter control module A — typically after replacing one of the modules without programming the new unit to match the rest of the network.
Is it safe to drive with U031B?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule replaced without programming
- PossibleWrong part number for the vehicle
- Less likelyGateway module routing CAN messages incorrectly
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
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Dc Dc Converter Module A
Related codes
- U0318Software Incompatibility with Power Steering Control Module
- U0319Software Incompatibility with Anti-Lock Brake System Control Module
- U031ASoftware Incompatibility With Transmission Range Control Module
- U031CSoftware Incompatibility With Brake System Control Module B
- U031DSoftware Incompatibility With Parking Assist Control Module A
- U031ESoftware Incompatibility With Parking Assist Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.