U0424Invalid Data Received From HVAC Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The HVAC control module reports climate requests and, on newer layouts, also the voltages of switches on the climate faceplate that it measures itself. U0424 says a receiver rejects these frames. GM documents the logic in the BCM of its 2025 vehicles: alive rolling counts, protection values, checksums or CRCs of the HVAC messages are checked every 10 ms, and 8 failures in 10 samples set a Type B fault once the BCM has been up for 5 s, the partial network has run for 3 s, power mode is Run and the battery has more than 11 V. As long as U0164 or U0424 is present the BCM suspends its faceplate switch tests (B2A01 and others), since their values come over CAN. GM's Saab 9-5 list (2011) contains U0424, and Ford marks it with the MIL in its 2014 code interpretation. U0164 is lost contact, U0324 software.
- What you may notice
- Climate controls or buttons react incorrectly or not at all
- A/C or defrost not available
- Check engine light on some makes
- Likely causes
- PossibleHVAC control module or faceplate electronics faulty
- PossibleLow battery voltage or a reset of the HVAC module during start-up
- RareHVAC or BCM software level that needs an update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.