What it means
The high-voltage interlock circuit of battery charging system B reports a circuit high 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 is a monitored safety chain. This code sets when its signal is higher than the expected range, which points toward a high-side electrical fault or a signal the module cannot interpret as a valid interlock state.
Common causes
Most likely first.
- Interlock signal interrupted
- Interlock connector not seated
- Connector pins corroded - high contact resistance
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
- Review freeze-frame data and related hybrid codes to verify the fault is associated with charging-system B's interlock and identify when it occurred.
- With the vehicle powered down, inspect accessible interlock B connectors and harnesses for loose seating, damage, or signs of moisture or corrosion.
- Check accessible wiring for a signal conductor shorted to a power feed, without probing or opening high-voltage components.
- Use scan-tool live data and the manufacturer's approved diagnostic tests to determine whether the interlock signal is persistently high.
- Have the circuit and module input tested against the manufacturer's specification using the prescribed high-voltage safety procedure.
Common fixes
- Reseat a loose accessible interlock connector.
- Repair wiring shorted to a power feed.
- Repair or replace damaged or corroded connector terminals.
- Replace a confirmed faulty interlock component.
Can I keep driving?
Charging may be disabled and hybrid or electric drive may be restricted while the safety chain is not reading correctly. Do not bypass or handle high-voltage connections; seek qualified service if the warning remains or the vehicle limits drive.
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.