Powertrain
generic / SAE
P251A
PTO Enable Switch Circuit/Open
The Power Take-Off (PTO) enable switch input to the ECM is open. PTO is used on trucks and work vehicles to drive auxiliary equipment from the engine — without a valid enable signal the ECM refuses to enter PTO operating mode, idle speed control changes do not apply.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 1A
Possible causes
- Open switch wire or unplugged switch high
- Failed PTO enable switch medium
- Pin pushed back out of connector body low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–350 €
- Estimated time: 0.3–1.5 h
- Component: pto enable switch
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012