P253D code meaning
PTO Sense Circuit High
Powertrain system Generic code P25xx codes Check engine light
What P253D means
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.
P253D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P253D
- MIL on without a noticeable PTO problem
- PTO status wrong in scan data
Common causes of P253D
- Most likelyOutdated TCM calibration (Ram heavy-duty with Aisin AS69RC, reflash per bulletin)
- PossibleSense wire shorted to a voltage source
- Less likelyOpen ground or reference at the PTO sense switch
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pto sense circuitTransmission control module
What each part of P253D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 3D | The exact fault in that area. |
What to do next
- Note P253D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P253D
What does P253D mean?
P253D means "PTO Sense Circuit High". P253D means the PTO feedback input reads above its valid range. It is a generic code, so it means the same on every make.
Is it safe to drive with P253D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P253D fail an emissions test?
Yes, it can. P253D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P253D to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P253D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.