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P1781 Diagnostic Trouble Code Discussion for January 2017

O/D Pressure Switch Sense Circuit Malfunction


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Trouble Ticket Help Requests for DTC P1781
Help Request Posted
2004 Chevrolet Aveo LS 1.6L MIL Lamp on VIN: KL1TJ52684
P1781: Engine Speed Signal Malfunction. Hey guys need a little help here . This is my wife's car she blew it up. I installed a used engine replaced the water pump and timing belt ,spark plugs etc , it runs great only problem is the check engine light keeps flashing once you hit around 20 mph, its no...
January 31, 2017