P0B37
High Voltage Service Disconnect Open
Generic OBD-II
Common symptoms
What you'll notice
- Check and tighten all connections of the high voltage service disconnect
- Inspect the high voltage service disconnect for any signs of damage or corrosion, and replace if necessary
Common causes
Most likely first
- Faulty wiring connections in the high voltage service disconnect circuit
- Malfunctioning high voltage service disconnect switch
- Defective high voltage service disconnect relay
- Damaged or broken wiring in the high voltage service disconnect circuit
- Faulty high voltage service disconnect control module
How to diagnose & fix
Work through it in order
- Loss of power or reduced performance
- Illumination of the warning light
- Electrical issues such as malfunctioning sensors or accessories
Read & clear P0B37 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.