LouieC

My 2004 Silverado LT 5.3 Towing our 26 ft Travel Trailer More pics with our boat coming soon

04 5.3 26' travel trailer hardly know its back there.....

GM codes P0740, P0753, P0758, P0785 and P1860 when they occur at the same time, the problem is not in the transmission, but they are the result of a faulty ignition switch. This is what these codes mean ( for your reference) : P0740 : TCC clutch circuit malfunction P0753 : Shift solenoid A electrical P0758 : Shift solenoid B electrical P0785 : Shift/Timing solenoid malfunction P1860 : TCC solenoid electrical fault If only one of these codes appears when you scan your vehicle, it is possible that the problem will be a malfunctioning solenoid in the transmission, but, like we mentioned earlier, if all of these codes appear at the same time, the problem is caused by a malfunctioning Ignition switch, the same circuit that provides the electrical current to these solenoids provides the electrical current for some of the gauges in your dash, ( circuit 1020 ) if the gear selector indicator light is not working, the tachometer, speedometer are not working, those are also signs of a faulty ignition switch. Usually the transmission will default to third gear when this problem occurs, this particular problem can be found in several GM vehicles including the following:

Check the grounds on the trans ....just a thought