P0B36High Voltage Service Disconnect Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B36 sets when the service disconnect detection signal stays above its upper limit. With a pulled-up input this usually means a short to a voltage source or a missing coding element in the plug; on some designs an open loop also reads high, so manufacturers separate it with P0B37 only where they can tell the cases apart. Patents from Ford and Lear show the detection loop as a low-voltage circuit that closes through the plug and is read by a battery or vehicle controller. No manufacturer documents P0B36 publicly. CARB requires such hybrid inputs to be monitored for out-of-range values. Low and performance faults are P0B35 and P0B34. The high-voltage system normally stays switched off.
- What you may notice
- Vehicle not ready to drive
- MIL and high-voltage warning on
- Charging blocked
- Likely causes
- LikelyDetection loop wire shorted to a supply voltage
- PossibleOpen loop or missing contact read as high signal
- RareWrong or damaged service disconnect plug without proper coding
- 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.