Code result
P251C
PTO Enable Switch Circuit High
Moderate severity
What it means
The PTO enable switch input reads stuck high — typically a short to battery voltage. The ECM cannot pull the input low, so the switch state is unreadable and PTO mode is locked out for safety.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Switch wire shorted to battery voltage
highOne of the most commonly reported causes for this code — check this first.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Supply wire pinched against B+ source
lowLess common, but worth ruling out after the more likely causes.
Related help
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