U056DInvalid Data Received From Image Processing Sensor H
- Generic OBD-II code · Network
- How the car detects it
- U056D is reported when sensor H's messages carry data that fail checks such as a CRC, an alive counter or an authentication value. AUTOSAR's end-to-end protection names the fault types behind this: repeated, lost, delayed, corrupted or masqueraded frames. GM uses the partner U026C on its object detection bus and lists it next to U0075, a bus-off code for a whole network. That split helps diagnosis: if the bus fails, a bus-off code and several lost-communication codes appear together; a lone U056D points to sensor H, its software or its own connector. Which camera is H is not public, and no brand documents U056D. Assistance that relies on it shuts off; no MIL.
- What you may notice
- Single assistance function unavailable while others work
- U056D stored without bus-off or other lost-communication codes
- Likely causes
- PossibleSensor H software computing counters or checksums incorrectly
- PossiblePoor contact at sensor H connector while the rest of the bus is fine
- RareImage processing sensor H internally faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.