What it means
The control module detects a fault in the hybrid/EV battery positive contactor circuit.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The battery positive contactor is a high-voltage switch that connects the hybrid or EV battery to the vehicle's high-voltage system when operation is allowed. This code sets when the control module detects an electrical fault in the positive contactor's coil or control circuit, so it may prevent the vehicle from entering or maintaining ready mode.
Common causes
Most likely first.
- Contactor circuit wiring or connector fault
- Contactor or coil fault
- Control circuit fault
Symptoms
- Hybrid system warning light
How to diagnose it
- Record freeze-frame data and check for related hybrid-system codes that may identify whether the contactor circuit fault is shared or isolated.
- Check the 12-volt battery condition and accessible low-voltage contactor control connectors, since weak supply or poor connections can affect control operation.
- Inspect accessible contactor control wiring for looseness, corrosion, damage, or signs of overheating without opening the battery enclosure.
- Have the positive contactor coil and control circuit tested for continuity and commanded response using the manufacturer's high-voltage safety procedure.
- If the circuit tests correctly, have the battery control module and its contactor command checked according to the manufacturer's procedure.
Common fixes
- Restore the 12-volt supply if it is weak or unstable.
- Repair a loose, corroded, or damaged low-voltage control connector.
- Repair damaged positive-contactor control wiring.
- Replace a failed contactor or repair the control module only after testing confirms the fault.
Can I keep driving?
Do not drive if the vehicle will not enter ready mode, displays a high-voltage system warning, or behaves unpredictably; arrange qualified hybrid or EV service. The contactor circuit is associated with hazardous high voltage, so do not open the battery or attempt contactor repairs yourself.
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.