P0E2F: High Voltage Fuse B
Do not keep driving
The car will probably not move, and it should not be jump-started, bridged or coaxed into running. A high-voltage fuse operates because something drew a dangerous current, and the fuse is the only thing that stopped it. Arrange recovery to a shop equipped for high-voltage work — and be clear that the exact specified fuse must be used, never a substitute.
What this code means
A high-voltage fuse has operated.
A high-voltage fuse is not a scaled-up version of the fuses in the box under the dashboard, and treating it as one is dangerous.
Interrupting several hundred volts of direct current is genuinely hard. Alternating current helps you — it crosses zero a hundred times a second, and an arc extinguishes itself at each crossing. Direct current never crosses zero, so an arc struck between the parting ends of a conductor will happily sustain itself and keep the circuit live through the plasma. A high-voltage fuse is therefore a sealed, sand-filled, precisely engineered device whose job is to quench that arc, and it costs accordingly.
Which is why it must never be substituted, bridged, or replaced with anything but the exact part. A fuse that cannot quench the arc does not fail safe — it fails as a short circuit inside a housing that is on fire.
And a blown high-voltage fuse is a symptom, not a fault. These do not fatigue and fail with age the way a small blade fuse does; they operate because something drew a current large enough to warrant it. Fitting a new one without finding what did that is how the second one gets blown, or worse.
A second high-voltage fuse implies a pack whose output is split across more than one protected branch, which is normal on a car with two drive motors or with a separate high-power auxiliary. The letter tells you which branch, and the vehicle's own documentation is the only thing that maps a letter to a physical location.
Likely causes
Start here
- Damaged high voltage cable insulation · specialist
- Accident damage to high voltage components · specialist
Less common
- Welded battery contactor · specialist
- Corroded or loose connector · specialist
- Weak or failed cell group in the battery pack · 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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- The car — make, model, year and engine. The same fault behaves differently on each.
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