Network
generic / SAE
U0324
Software Incompatibility with HVAC Control Module
The HVAC controller is running software incompatible with the rest of the network. Climate functions may default to a basic operating mode.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number3 / 24
Possible causes
- Incompatible flash after HVAC swap high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
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
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.3–2 h
- Component: hvac module
Sources
References
sae:J2012