What it means
The control module monitors high voltage fuse B for continuity. It sets this code when the fuse is detected as open, interrupting the associated high voltage circuit.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
High-voltage fuse B protects and completes its associated high-voltage circuit, and the control module monitors whether that fuse path has continuity. P0E2F sets when fuse B is detected open, which can reduce power or charging and may indicate a downstream short that caused the fuse to open.
Common causes
Most likely first.
- Fuse blown by short circuit
- Downstream short circuit
Symptoms
- Hybrid/EV system warning light may turn on
- Reduced power or charging performance
How to diagnose it
- Save freeze-frame data and check for related high-voltage system codes and symptoms such as reduced power or charging problems.
- Have the high-voltage system made safe using the manufacturer's isolation procedure before inspecting fuse B or its circuit.
- Inspect fuse B and its connections for an open fuse, heat damage, or poor contact using the specified service procedure.
- If fuse B is open, check its downstream circuit and connected components for a short before replacing it.
- After correcting any cause, fit only the specified fuse and verify continuity and system operation using the manufacturer's procedure.
Common fixes
- Repair the downstream short that caused fuse B to open.
- Replace high-voltage fuse B with the specified type after the circuit fault is corrected.
- Repair damaged connections or wiring in fuse B's protected circuit.
- Repair the associated component if it is confirmed to be drawing excessive current.
Can I keep driving?
Avoid relying on the vehicle for normal use because reduced power or charging performance may worsen, and limp mode is possible. High-voltage fuse B requires proper isolation and service procedures; stop safely if power drops or a hybrid-system warning appears.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.