OBD-II code · Network
U0338 Software Incompatibility With Remote Function Actuation Module
A module reports a software version mismatch with the remote function actuation module — 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 U0338?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
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
- Remote Function Module
Related codes
- U0335Software Incompatibility With Hybrid/EV Battery Pack Sensor Module
- U0336Software Incompatibility With Restraints Control Module
- U0337Software Incompatibility With Battery Charger Control Module A
- U0339Software Incompatibility With Body Control Module B
- U033ASoftware Incompatibility With Hybrid/EV Battery Interface Control Module A
- U033BSoftware Incompatibility With Hybrid/EV Battery Interface Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.