Powertrain, generic

P0E36 DC/DC Converter Voltage Sensor B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Open sense wire or unplugged connector
Second measuring path inside the converter failed
Poor ground of the converter

Symptoms

  • Warning light, possibly 12 V battery warning
  • Start-stop disabled or converter output reduced

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dcdc voltage sensor bwiring harnessdcdc converter

Related codes

P0E31P0E37P0E38P0E39P0E3A

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.