P2A35AFCM Power Relay Sense Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Besides driving the relay coil, a control module can read back the voltage behind the relay contacts to confirm that power actually arrives. P2A35 is the general fault of this feedback line for the relay that supplies the gas control module, without a statement about too low or too high. Typical are an open sense wire, a corroded pin or a blown fuse between contact and sense point. Roush CleanTech's propane manual for Ford trucks lists a missing supply, a blown fuse or lost power and ground of its alternative fuel module as reasons for losing it on the bus (U0108), which shows how supply problems surface there. No published calibration uses P2A35; the engine-relay sibling P0688 is the analogue. Electrical symptoms may be absent while the relay itself still works.
- What you may notice
- Check engine light, depending on calibration
- Often no drivability change
- Occasional fallback to petrol if the supply really drops
- Likely causes
- LikelySense wire open or pin backed out
- PossibleBlown fuse between relay contact and sense point
- PossibleCorroded terminals in relay socket or module plug
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.