What it means
The high-voltage interlock circuit of battery charging system B reports a circuit intermittent/erratic 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 lets the control module monitor continuity through a safety chain. This code sets when the signal changes erratically or drops out intermittently, often because a connector or wire loses contact with vibration.
Common causes
Most likely first.
- Interlock signal interrupted
- Interlock connector not seated
- Connector with intermittent contact under vibration
Symptoms
- Check-engine or hybrid-system warning light
- Charging may be disabled intermittently
- Hybrid or electric drive may be limited or unavailable
How to diagnose it
- Check freeze-frame data and related codes for whether the interlock fault appeared during charging, movement, or a change in vehicle operating state.
- With the vehicle powered down, inspect accessible system B interlock connectors for loose seating, damaged locks, or harness tension.
- Look over accessible wiring for chafing, corrosion, or damage that could cause contact to break intermittently.
- Use scan-tool live data during manufacturer-approved checks to see whether the interlock state flickers or drops out.
- Have the affected circuit checked for intermittent continuity using the manufacturer's procedure and high-voltage safety precautions.
Common fixes
- Reseat a loose accessible interlock connector.
- Secure or repair a harness that is strained or chafing.
- Repair corroded or damaged terminals and connector locks.
- Replace a confirmed faulty interlock component.
Can I keep driving?
Charging can stop unexpectedly, and electric drive may become limited if the interlock signal drops out. Avoid depending on charging or electric drive until the fault is repaired, 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.