U04A7Invalid Data Received From Hybrid/EV Battery Interface Control Module G
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U04A7 points to interface module G. In a modular battery management system each board sits at a different potential: the ground of the top module can be hundreds of volts above that of the bottom one, so the boards talk through isolated links such as optocouplers or radio. Interference, moisture in a connector or an ageing isolator can corrupt the frames of a single board without breaking the link altogether, and the battery controller then logs an invalid-data code for that letter. No manufacturer publishes U04A7 or thresholds for it. In GM's table 16OBDG02, G is the seventh of eight boards. U01A6 stands for lost contact with G, U0340 for a software mismatch. Charging or drive power may be limited.
- What you may notice
- Battery or hybrid system warning
- Charging or drive power limited
- Fault may come and go with humidity or temperature
- Likely causes
- PossibleMoisture or corrosion at internal connectors (leaking pack seal)
- PossibleFailing isolated communication stage on board G
- RareInterface control module G otherwise defective
- 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 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.