U0305
Software Incompatibility with Cruise Control Module
A control module has detected that its software/calibration is incompatible with the cruise control module. Cruise control may be disabled until matching software is flashed.
- 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.
- Software/calibration mismatch with cruise moduleCommon
- Used cruise module from different vehicle fittedPossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Cruise Control Module
- Control Module
U0305 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.