What it means
The high-voltage interlock circuit of battery charging system B reports a circuit/open 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 part of a safety chain that lets the vehicle detect whether monitored high-voltage connections are properly closed. This code sets when the module sees that chain as open or electrically interrupted, so it may disable charging or restrict electric drive.
Common causes
Most likely first.
- Interlock signal interrupted
- Interlock connector not seated
- Pin pushed back out of connector body
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
- Read freeze-frame data and hybrid-system codes to identify when the charging-system B interlock fault appeared and whether related interlock faults are present.
- With the vehicle powered down, visually inspect accessible charging-system B interlock connectors and harnesses for a loose fit, damage, or a pin pushed back into the connector body.
- Check connector seating and visible pin condition without touching or opening high-voltage components.
- Use the vehicle's scan tool data or manufacturer-approved diagnostics to determine which monitored interlock segment is reporting open.
- Have the interlock circuit continuity and module inputs checked using the manufacturer's high-voltage safety procedure.
Common fixes
- Fully seat an accessible, correctly identified interlock connector according to the vehicle's service procedure.
- Repair or replace a damaged low-voltage interlock harness or connector.
- Repair a pushed-back or damaged terminal using the specified connector repair method.
- Replace a failed interlock component if circuit testing identifies it.
Can I keep driving?
Charging may be disabled and hybrid or electric drive may be limited or unavailable; do not attempt to bypass the interlock or handle high-voltage connections. If the vehicle reports a hybrid-system fault or drive limitation, stop in a safe place and arrange service by a qualified high-voltage technician.
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.