P253DPTO Sense Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P253D means the PTO feedback input reads above its valid range. Besides genuine shorts to voltage or an open ground on the sense switch, Ram documents a software cause: bulletin 21-013-15 (replacing 21-005-14) covers 2013–2014 Ram 3500 pickups and 3500, 4500 and 5500 chassis cabs with the 6.7L Cummins and Aisin AS69RC six-speed, where the MIL came on with P253D stored in the transmission module although no defect could be found. The fix was a TCM reflash followed by a quick learn. Its later successor 21-017-19, in revision A, repeats this for 2013–2017 models with that gearbox. So Ram evaluates the PTO sense line in the TCM and treats P253D as MIL-relevant. Open circuit is P253A, low P253C.
- What you may notice
- MIL on without a noticeable PTO problem
- PTO status wrong in scan data
- Likely causes
- LikelyOutdated TCM calibration (Ram heavy-duty with Aisin AS69RC, reflash per bulletin)
- PossibleSense wire shorted to a voltage source
- RareOpen ground or reference at the PTO sense switch
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.