High Voltage System Interlock Circuit A Low

Common symptoms

What you'll notice

• Check and replace any faulty fuses or relays related to the high voltage system interlock circuit
• Inspect and repair any damaged or loose connections in the high voltage system interlock circuit
• Test and replace the high voltage system interlock circuit sensor or switch if it is found to be malfunctioning
• Ensure that the high voltage system interlock circuit wiring and components are properly grounded

Common causes

Most likely first

1. Faulty interlock relay or fuse
2. Short circuit in the interlock wiring
3. Malfunctioning high voltage controller
4. Defective interlock switch
5. Faulty high voltage battery pack

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Difficulty starting the vehicle
3. Decreased fuel efficiency
4. Loss of power or sluggish acceleration
5. Illumination of the check engine light