P0B37 code meaning
High Voltage Service Disconnect Open
Powertrain system Generic code P0Bxx codes Check engine light
What P0B37 means
P0B37 means the controller sees the service disconnect as open, either because the plug is really removed or because its detection loop is broken. Ford uses the code in the battery energy control module of the 2013-2016 C-Max Energi: bulletins SSM 46108 and TSB 17-0015 describe intermittent stalls or no crank with a Stop Safely Now message and MIL, stored with U3012 and, in another module, the interlock code P0A0A. The cause was an intermittent short to ground in the low-voltage interlock wiring, found by inspecting the harness for chafing. P0B33 to P0B36 cover circuit, performance, low and high faults. For the driver: the car shuts down or will not start.
P0B37 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B37
- Intermittent stall or no crank
- Stop Safely Now message and MIL
- High-voltage interlock code stored in another module
Common causes of P0B37
- Most likelyLow-voltage interlock wiring chafed with intermittent short to ground (Ford C-Max)
- PossibleService disconnect plug removed, loose or not locked
- PossibleOpen terminal in the plug base or interlock connector
- Less likelyBattery energy control module fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv service disconnect switchWiring harnessBms
What each part of P0B37 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| 37 | The exact fault in that area. |
What to do next
- Note P0B37 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0B37
What does P0B37 mean?
P0B37 means "High Voltage Service Disconnect Open". P0B37 means the controller sees the service disconnect as open, either because the plug is really removed or because its detection loop is broken. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B37?
Drive gently and only to a workshop. With P0B37 the car can go into limp mode (reduced power) to protect itself.
Will P0B37 fail an emissions test?
Yes, it can. P0B37 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0B37 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P0B37 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.