Network, generic

U0424 Invalid Data Received From HVAC Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

HVAC control module or faceplate electronics faulty
Low battery voltage or a reset of the HVAC module during start-up
HVAC or BCM software level that needs an update

Symptoms

  • Climate controls or buttons react incorrectly or not at all
  • A/C or defrost not available
  • Check engine light on some makes

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–700
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hvac control modulecan bus wiring

Related codes

U0164U0324U0466U046C

References: gsi.ext.gm.com, saabwisonline.com, performanceparts.ford.com.