OBD-II code · Network
U0325 Software Incompatibility with Auxiliary Heater Control Module
The auxiliary heater module is running incompatible software. The pre-heater may not start or aborts operation early.
Is it safe to drive with U0325?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIncompatible flash version
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Auxiliary Heater
Related codes
- U0322Software Incompatibility with Body Control Module B
- U0323Software Incompatibility With Instrument Panel Control Module
- U0324Software Incompatibility with HVAC Control Module
- U0326Software Incompatibility With Vehicle Immobilizer Control Module
- U0327Software Incompatibility with Powertrain Control Module
- U0328Software Incompatibility With Steering Angle Sensor Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.