PTO Enable Switch Circuit Low
The PTO enable switch input reads stuck low — typically a short to ground or a permanently closed switch. The ECM either sees PTO enabled when the operator has not requested it, or cannot release the PTO mode after work.
Affected components
- Pto enable switch
- Wiring harness
Common causes
- High likelihood: Switch wire shorted to ground
- Medium likelihood: Switch stuck closed
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.