U04A6Invalid Data Received From Hybrid/EV Battery Interface Control Module F
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U04A6 is set when interface control module F delivers messages the battery controller cannot accept. A board like this checks itself as well: in GM's 16OBDG02 table every interface module, F included, runs four processor performance tests once at each ignition change, for example confirming that its analogue-to-digital converter shows no stuck bits when the input is forced to its limits, Type A after 8 failures in 10 samples. Such internal faults get their own GM P1 codes; U04A6 is meant for the case where the receiver itself judges the incoming data unusable. No manufacturer documents U04A6 publicly. U01A5 means F has stopped talking, U033F that its software does not fit. Expect a hybrid or EV warning and restricted output.
- What you may notice
- Hybrid or EV warning, MIL on plug-in hybrids
- Reduced power output
- Likely causes
- PossibleProcessor or converter fault on interface board F
- PossibleContact fault on the internal data link to module F
- RareSupply dropouts of the battery electronics during switch-on
- 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: €150 – €2,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.