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P1781 Diagnostic Trouble Code Discussion for November 2005

O/D Pressure Switch Sense Circuit Malfunction


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Trouble Ticket Help Requests for DTC P1781
Help Request Posted
2001 GMC Sierra 2500 HD SL 8.1L No Start
P1781: eng torque or mil request fault. This truck will not start after the customer has been driving it and parks it for a short time. Sometimes it's just a extended crank time before it will start and some times it takes a hour or more before it will start again. Truck will run fine after each epi...
November 19, 2005
2001 GMC Sierra 2500 HD SL 8.1L No Start
P1781: eng torque or mil request fault. This truck will not start after the customer has been driving it and parks it for a short time. Sometimes it's just a extended crank time before it will start and some times it takes a hour or more before it will start again. Truck will run fine after each epi...
November 19, 2005