What it means
The high-voltage interlock circuit of battery charging system B reports a circuit performance condition. Safety interlock chain may be compromised.
At a glance
- Usually lights the check-engine light
How it works
Battery charging system B's high-voltage interlock forms part of a safety chain monitored by the control module. This performance code sets when the interlock signal behaves inconsistently with the expected operating pattern, even if it is not simply stuck open or consistently low or high.
Common causes
Most likely first.
- Interlock signal interrupted
- Interlock connector not seated
Symptoms
- Check-engine or hybrid-system warning light
- Charging may be disabled
- Hybrid or electric drive may be limited or unavailable
How to diagnose it
- Check freeze-frame data and related hybrid-system codes to find whether the performance fault coincided with charging, vibration, or another interlock warning.
- With the vehicle powered down, inspect accessible system B interlock connectors for incomplete seating, damaged locks, or harness strain.
- Look for visible corrosion, moisture, or damage at accessible low-voltage interlock wiring and connectors.
- Use scan-tool live data to observe the system B interlock state during the manufacturer's approved connector or harness checks.
- If the signal remains implausible, have the interlock circuit and relevant module inputs tested using the manufacturer's procedure.
Common fixes
- Reseat a loose accessible interlock connector according to the service procedure.
- Repair damaged or strained interlock wiring and connector locks.
- Clean or replace a corroded connector using the specified repair method.
- Replace a confirmed faulty interlock component.
Can I keep driving?
Charging may be disabled, and hybrid or electric drive may be restricted if the safety chain cannot be validated. Avoid relying on the vehicle for a trip that requires dependable charging or electric drive, and do not disturb high-voltage connections.
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.