U043AInvalid Data Received From Suspension Control Module B
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- Suspension control module B is a second chassis controller, often the one that runs adjustable dampers while module A handles levelling. U043A is logged when its frames reach a receiver but fail integrity checks. GM's 2025 tables give the example of the electronic brake module reading the damper control information: a rolling count equal to the previous one or a protection value that does not add up counts as an error, and 8 errors in a sliding window of 16 set the fault. The check runs only between 9 and 16 V, not during engine start and not within 5 s after a power mode change or reset; it is Type C, so no MIL. Ride control may drop to a fixed default and stability functions may be restricted. U0139 is lost contact, U0421 refers to module A.
- What you may notice
- Service suspension or ride control warning
- Ride noticeably firmer or softer than usual
- Likely causes
- PossibleDamper module resets or hangs, sending frozen counters
- PossibleLow supply voltage at the suspension module
- RareSoftware of suspension and brake modules not matched
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.