P0E37 code meaning
DC/DC Converter Voltage Sensor B Range/Performance
Powertrain system Generic code P0Exx codes Check engine light
What P0E37 means
P0E37 says that voltage sensor B delivers a believable number which nevertheless disagrees with what the vehicle measures elsewhere. GM's 2025 engine tables (25OBDG03A) check raw voltage value 2 of the converter against the ECM run/crank voltage: in bypass mode a gap above 2 V counts, and 320 failed samples out of 400 at 12.5 ms set a Type B code. During an automatic engine restart the converter stabilises the 12 V supply, and then 8 of 16 samples are enough. FCA, which calls this channel voltage sensor 2, changed the code from a two-trip to a one-trip code with flash 08-037-21 for the 2021 Ram 1500 eTorque. Drift in the measurement, voltage drop on wiring or outdated software are typical; hard shorts are P0E38 and P0E39.
P0E37 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0E37
- MIL on, after one or two trips depending on maker and software
- Start-stop unavailable
Common causes of P0E37
- Most likelySecond voltage measurement in the converter drifting
- PossibleVoltage drop on supply or ground wiring distorting the comparison
- PossibleController software needing an update (FCA eTorque)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Dcdc voltage sensor bWiring harnessDcdc converter
What each part of P0E37 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 37 | The exact fault in that area. |
What to do next
- Note P0E37 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0E37
What does P0E37 mean?
P0E37 means "DC/DC Converter Voltage Sensor B Range/Performance". P0E37 says that voltage sensor B delivers a believable number which nevertheless disagrees with what the vehicle measures elsewhere. It is a generic code, so it means the same on every make.
Is it safe to drive with P0E37?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0E37 fail an emissions test?
Yes, it can. P0E37 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0E37 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0E37 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.