P0E37DC/DC Converter Voltage Sensor B Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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 Drift in the measurement, voltage drop on wiring or outdated software are typical; hard shorts are P0E38 and P0E39.
- What you may notice
- MIL on, after one or two trips depending on maker and software
- Start-stop unavailable
- Likely causes
- LikelySecond voltage measurement in the converter drifting
- PossibleVoltage drop on supply or ground wiring distorting the comparison
- PossibleController software needing an update (FCA eTorque)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.