U04A7 code meaning
Invalid Data Received From Hybrid/EV Battery Interface Control Module G
Network system Generic code U04xx codes Check engine light
What U04A7 means
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.
U04A7 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor2 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U04A7
- Battery or hybrid system warning
- Charging or drive power limited
- Fault may come and go with humidity or temperature
Common causes of U04A7
- PossibleMoisture or corrosion at internal connectors (leaking pack seal)
- PossibleFailing isolated communication stage on board G
- Less likelyInterface control module G otherwise defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery interface module g
What each part of U04A7 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A7 | The exact fault in that area. |
What to do next
- Note U04A7 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U04A7
What does U04A7 mean?
U04A7 means "Invalid Data Received From Hybrid/EV Battery Interface Control Module G". U04A7 points to interface module G. It is a generic code, so it means the same on every make.
Is it safe to drive with U04A7?
Drive gently and only to a workshop. With U04A7 the car can go into limp mode (reduced power) to protect itself.
Will U04A7 fail an emissions test?
Yes, it can. U04A7 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U04A7 to fix?
Difficulty: workshop only. A typical repair takes 2 to 10 hours of work. This is a job for a workshop.
Will U04A7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.