P0B37High Voltage Service Disconnect Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Intermittent stall or no crank
- Stop Safely Now message and MIL
- High-voltage interlock code stored in another module
- Likely causes
- 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
- RareBattery energy control module fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.