Network
generic / SAE
U040A
Invalid Data Received From Air Conditioning Control Module
A receiving module detected implausible data from the A/C control module. Compressor enable, blower or refrigerant pressure values fail plausibility checks against other inputs and are rejected.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number4 / 0A
Possible causes
- Module internal fault or sensor input drift high
- Software version mismatch after replacement medium
- Gateway module routing CAN messages incorrectly 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: 80–1200 €
- Estimated time: 0.5–3 h
- Component: ac control module
- drive cycle required
Sources
References
sae:J2012