What it means
The DC/DC converter voltage sensor B reading is outside the expected range or does not respond as expected.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The DC/DC converter voltage sensor B reports a voltage used to monitor converter operation. P0E37 sets when the reading is present but falls outside the expected range or does not track converter conditions as the control module expects.
Common causes
Most likely first.
- Sensor characteristic drifted
- Sensor mounting displaced
- Sensor element aged beyond calibration window
Symptoms
- Hybrid/EV system warning light may turn on
- Reduced power or charging performance
How to diagnose it
- Use freeze-frame data and live data to compare sensor B's reading with sensor A and available converter voltage data under the recorded conditions.
- Inspect sensor B's mounting, connector, and nearby harness for displacement, looseness, corrosion, or damage that could skew its reading.
- Check the sensor B signal, power, and ground against the manufacturer's wiring diagram and specifications.
- If the circuit checks out, test sensor B's response as converter conditions change using the manufacturer's diagnostic procedure.
- Replace or reposition the sensor only when testing identifies drift, incorrect mounting, or a failed sensing element, then verify the reading.
Common fixes
- Secure or correctly reposition voltage sensor B if its mounting has shifted.
- Clean and reseat a loose or corroded sensor B connector.
- Repair wiring or ground faults that distort sensor B's reading.
- Replace sensor B if its output remains out of range despite a sound circuit and correct mounting.
Can I keep driving?
Reduced power or charging performance may occur, so limit driving to what is needed to reach a safe place or repair facility. Avoid relying on the vehicle until the converter voltage reading is confirmed accurate.
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.