P0E36DC/DC Converter Voltage Sensor B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P0E36 is the catch-all circuit code for the second voltage measurement of a DC/DC converter, sensor B. Where a converter reads both its input and its output, or monitors one rail twice, the second path gets the letter B; FCA names it voltage sensor 2 on the 2021 Ram 1500 eTorque. No manufacturer documents P0E36 itself in public sources. GM's 2025 engine tables treat sensor B through its sibling codes only: below 1 V is P0E38, above 28 V is P0E39, and a gap of more than 2 V to the ECM run/crank voltage is P0E37. P0E36 is left for electrical faults that fit none of those, such as an open line the controller recognises as such. CARB asks for circuit faults of inputs to be detected separately where feasible. Converter output may be reduced.
- What you may notice
- Warning light, possibly 12 V battery warning
- Start-stop disabled or converter output reduced
- Likely causes
- LikelyOpen sense wire or unplugged connector
- PossibleSecond measuring path inside the converter failed
- RarePoor ground of the converter
- 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.