P0B36: High Voltage Service Disconnect Circuit High
Do not keep driving
As P0B33 and P0B35 — the fault is in the reporting circuit, the car cannot verify the plug, and it will not power up until it can. That is the system working correctly.
What this code means
The service disconnect's monitoring circuit is reading above its valid range — a short to a live circuit, or an open in a loop the module expects to find pulled down.
As at P0B35, this describes the monitoring rather than the plug, and the vehicle's refusal to energise is the conservative response to not knowing. What the device is, and why the circuit is never bridged, are at P0B33.
Likely causes
Start here
- Wiring shorted to voltage · specialist
- Corroded or loose connector · specialist
Less common
- Damaged wiring harness · specialist
- High voltage cover or connector not latched · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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