P0B35High Voltage Service Disconnect Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B35 sets when the service disconnect detection signal stays below its lower limit. Where the loop is coded with a resistor in the plug, as in a Lear patent, a reading near zero typically points to a short to ground in the loop wiring; the exact meaning depends on how the manufacturer powers the input. Ford traced an intermittent short to ground in the low-voltage interlock wiring as the cause of its open-loop code P0B37 on the C-Max Energi, which shows how chafed harnesses act here. No manufacturer documents P0B35 publicly. CARB treats such signals as monitored hybrid inputs. High, open and performance faults are P0B36, P0B37 and P0B34. The contactors usually stay open.
- What you may notice
- No ready mode or stall with a stop-safely message
- MIL and high-voltage warning on
- Charging not possible
- Likely causes
- LikelyDetection loop wire chafed and shorted to ground
- PossibleMoisture or corrosion in the plug base bridging to ground
- RareCoding element in the plug shorted
- RareBattery controller input stage 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.