What it means
The processor in battery charger control module B is not performing as expected. The code does not identify a specific processor test failure.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The processor in battery charger control module B runs the module's charging-control tasks and internal checks. This code sets when the processor does not meet expected performance; it does not specify whether a watchdog reset, memory check, or software issue triggered the failure.
Common causes
Most likely first.
- CPU watchdog repeatedly resets
- RAM check failed
- Module software outdated, reflash may resolve
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
How to diagnose it
- Read freeze-frame data and module codes to check whether the processor fault coincides with interrupted charging, a power event, or communication errors.
- Use a scan tool to check module B's reported resets, processor status, and communication with the battery management system if those data are available.
- With the vehicle powered down according to the manufacturer's procedure, inspect module B connectors and accessible wiring for poor connections or damage.
- Test module B power and ground circuits against the manufacturer's specification, since supply interruptions can disrupt processor operation.
- If supplies and wiring pass, check for a manufacturer-approved software update and perform the prescribed processor or module diagnostics.
Common fixes
- Repair poor power, ground, or connector connections at battery charger control module B.
- Install a manufacturer-approved software update if one addresses the processor fault.
- Repair a confirmed communication fault between module B and the battery management system.
- Replace module B if its processor continues to fail the manufacturer's checks with sound power, wiring, and software.
Can I keep driving?
Treat interrupted or slow charging as a risk to your available driving range, and plan a shorter trip until charging is reliable. If the vehicle will not enter Ready mode or displays a high-voltage warning, stop using it.
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.