PTO Engine Shutdown Circuit Low
The PTO engine-shutdown command line reads stuck low — usually a short to ground or a permanently asserted shutdown request. The ECM may treat this as an active shutdown command and refuse to start or keep the engine running while in PTO mode.
Affected components
- Pto shutdown circuit
Common causes
- High likelihood: Shutdown wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Harness chafing through insulation
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.