P0E3ADC/DC Converter Voltage Sensor B Intermittent/Erratic
- 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
- P0E3A covers an unsteady signal from voltage sensor B of a DC/DC converter: short spikes, dropouts or noise that never last long enough for the hard low or high codes. Publicly, no manufacturer documents P0E3A. For orientation, GM's 2025 engine tables (25OBDG03A) accept 1 to 28 V on raw voltage value 2 and only set P0E38 or P0E39 after roughly four seconds out of five of continuous failure, so brief disturbances slip past those tests. FCA calls this channel voltage sensor 2 on the Ram 1500 eTorque. CARB wants inputs checked for circuit, range and rationality faults; an erratic code is the gap filler. A fault confined to sensor B while sensor A is steady narrows the search to the B wiring and its terminals, often in a spot that moves with the engine.
- What you may notice
- Sporadic warning light, sometimes cleared on its own
- Start-stop unavailable from time to time
- Likely causes
- LikelyHarness rubbing intermittently where it moves with the engine
- PossiblePoor terminal tension in the sensor B circuit
- RareElectrical interference on an unshielded sense line
- 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: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.