P260CPTO Control Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P260C signals that the PTO control output reads too high, usually because the relay control line touches a powered wire or the relay coil draws too much current. GM lists it as P260C.00, a high voltage on the PTO relay control line, in the diagnostic table of the PTO module that GM fitted to Silverado and Sierra 3500 HD chassis cab trucks from 2008 to 2014. Since that module switches the relay on both its feed and its ground side, a short to voltage can leave the relay pulled in when it should have dropped out. Body builders splice into this circuit, so their added wiring is the likely suspect. CARB lets the OBD system pause selected monitors while a PTO runs, so a wrong PTO state matters beyond the work equipment. P260B is the low-side code, P260A the open circuit.
- What you may notice
- PTO will not engage or will not release
- PTO indicator behaves abnormally
- Likely causes
- LikelyRelay control wire shorted to a powered circuit
- PossibleRelay or solenoid coil with too low resistance
- PossibleFaulty splice or add-on wiring from the body installation
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.