What it means
A control module received invalid data from hybrid/EV battery interface control module A. The code identifies a data validity fault; the specific affected function depends on the vehicle.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
Hybrid/EV battery interface control module A supplies battery-related information to other vehicle modules. This code sets when a receiving module judges the data from interface module A invalid; it does not identify a specific battery cell or prove the battery itself has failed.
Common causes
Most likely first.
- Fault in the transmitting module
- Network wiring or connector fault
- Module power or ground fault
- Software or configuration mismatch
Symptoms
- Hybrid or EV battery warnings may appear
- Battery or vehicle performance may be limited
How to diagnose it
- Record freeze-frame data and scan all modules for high-voltage battery and network codes, noting which module reports invalid data from interface module A.
- Compare available live data for interface module A with data from the other battery interface modules and look for missing or implausible readings.
- With the high-voltage system left untouched, visually inspect accessible low-voltage connectors and harnesses for interface module A for damage, corrosion, or poor seating.
- Have the module's low-voltage power and ground and the related network wiring checked using the manufacturer's safety procedures.
- If circuits are sound, check module A for applicable software or configuration issues and follow manufacturer guidance for further battery-system diagnosis.
Common fixes
- Repair an accessible loose, corroded, or damaged low-voltage connector or harness serving interface module A.
- Restore a faulty low-voltage power or ground connection to interface module A.
- Correct a software or configuration mismatch using the manufacturer's procedure.
- Repair or replace interface module A if testing confirms that it is transmitting invalid data.
Can I keep driving?
If a hybrid or EV battery warning, reduced power, or a stop-vehicle message appears, stop in a safe place and follow the vehicle's instructions; do not continue if the vehicle limits propulsion. Do not touch high-voltage components, and arrange prompt diagnosis because battery performance or protection may be limited.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.