What it means
A control module received invalid data from hybrid/EV battery interface control module B. 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 B sends battery-related information to other vehicle modules. This code sets when a receiving module judges the data specifically from interface module B invalid; it does not by itself mean module A or the battery pack 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 battery and network codes, identifying the receiver that flagged data from interface module B.
- Review available live data from interface module B and compare it with the corresponding readings from other battery interface modules for missing or implausible values.
- Without opening or disconnecting high-voltage components, inspect accessible low-voltage connectors and wiring for interface module B for damage, corrosion, or loose seating.
- Have interface module B's low-voltage power and ground and its network connections checked according to the manufacturer's safety procedure.
- If the circuits are sound, check for software or configuration issues specific to module B and follow manufacturer guidance for further diagnosis.
Common fixes
- Repair a loose, corroded, or damaged accessible low-voltage connector or harness for interface module B.
- Restore a faulty low-voltage power or ground connection to interface module B.
- Correct a software or configuration mismatch using the manufacturer's procedure.
- Repair or replace interface module B if tests confirm it is sending invalid data.
Can I keep driving?
If a battery warning, reduced propulsion, or a stop-vehicle alert appears, stop safely and follow the vehicle's instructions; continuing may leave limited power or protection. Keep clear of high-voltage components and arrange prompt diagnosis.
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.