OBD-II code · Network
U0326 Software Incompatibility With Vehicle Immobilizer Control Module
A module reports a software version mismatch with the vehicle immobilizer control module — typically after replacing one of the modules without programming the new unit to match the rest of the network. The engine may refuse to start.
Is it safe to drive with U0326?
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
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Immobilizer Module
Related codes
- U0323Software Incompatibility With Instrument Panel Control Module
- U0324Software Incompatibility with HVAC Control Module
- U0325Software Incompatibility with Auxiliary Heater Control Module
- U0327Software Incompatibility with Powertrain Control Module
- U0328Software Incompatibility With Steering Angle Sensor Module
- U0329Software Incompatibility With Steering Column Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.