Powertrain, generic (extended)

P253D PTO Sense Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Outdated TCM calibration (Ram heavy-duty with Aisin AS69RC, reflash per bulletin)
Sense wire shorted to a voltage source
Open ground or reference at the PTO sense switch

Symptoms

  • MIL on without a noticeable PTO problem
  • PTO status wrong in scan data

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–400
Time0.5–2 h

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

Parts involved

pto sense circuittransmission control module

Related codes

P253AP253BP253CP253E

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.