U031C
Software Incompatibility With Brake System Control Module B
A module reports a software version mismatch with brake system control module B — typically after replacing one of the modules without programming the new unit to match the rest of the network.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
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
Common causes
Ordered by how often each turns out to be the cause.
- Module replaced without programmingCommon
- Wrong part number for the vehiclePossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Brake System Module B
U031C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.