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P1781 Diagnostic Trouble Code Discussion for May 2008

O/D Pressure Switch Sense Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1781
Help Request Posted
2004 Chevrolet Aveo 1.6L MIL Lamp on VIN: KL1TD52674
P1781: Engine Speed Signal Malfunction. thanks for any and all help on this one. orginially came in with po300 and po1781. changed plugs and wires. no help, can find no intermitten miss. tested po1781 tcm sending engine speed info to pcm false. test called for checking voltage on c.a.n system from p...
May 30, 2008