P253C flags a PTO feedback input that reads too low for any valid switch state. Where the sense switch closes to ground on engagement, a grounded wire looks like a permanently engaged PTO; where it pulls up, the same fault hides every engagement. Common causes are a wire rubbed through near the transmission-mounted PTO, oil or water in the switch connector and a shorted pressure switch. No maker publishes P253C; Ram's bulletins on the high-side code P253D show that some makers evaluate this input in the transmission module, and Ford states that readiness is reset while PTO mode runs, so a false engaged signal can keep monitors from completing. Open circuit is P253A, high level P253D.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- PTO shown as engaged although it is off, or never shown as engaged
- Readiness monitors stay incomplete
- Possible MIL
Most likely causes
- Sense wire rubbed through to ground near the PTO
- Oil or water in the sense switch connector
- PTO pressure switch shorted
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P253C means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 5: Speed and idle
- 3C: Specific fault in that system
Frequently asked questions
Can I keep driving with code P253C?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P253C?
The most common causes are: sense wire rubbed through to ground near the PTO; oil or water in the sense switch connector; pTO pressure switch shorted.
Related codes
- P253APTO Sense Circuit/Open
- P253BPTO Sense Circuit Range/Performance
- P253DPTO Sense Circuit High
- P253EPTO Sense Circuit Intermittent/Erratic
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.