Pontiac Transport Engine Transmission Code P0740 And P0753

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1997 Pontiac Transport SE Check Engine Light code p0740 p0753. Question = I know the codes p0753 p0740 what should I expect to pay to get the van fixed? Can I drive it? What will happen if I did? Please advise!

Answer:
If you are thinking that you need to replace the 1-2 shift solenoid, and the TCC solenoid, the parts are approx. $175 with gaskets and fluid. It is quite labor intensive. The entire dr. side frame needs to be lowered to remove the side cover. Expect to pay 5-6 hours labor. Driving with these codes, and the probable shifting problems for an extended period of time can start to cause other internal transmission problems.

Note: I did a search and there is a service bulletin describing these codes that may be an electrical problem not in the transmissio, and not the solenoids.

1998 Pontiac Transport. ABS light & coolant light with Fuel injector code. We replaced valve cover gaskets, alternator, spark plugs and wires, fuel injector. The codes still returned and the van does not run good.

Question = I have replaced all of these items on my van the only thing that was wrong with it we thought we fixed. Now it is missing. It only has two gears- 2nd and 3rd. It won't go into drive or overdrive. The van stops missfiring when they loosen up the radiator cap but not understanding how that can be.

Is there anyway you can help me figure out what the problem may be, thanks.

Answer:
With all the work that has been done, it is possible that something was not installed properly. With the trans, sounds like it is starting out in 2nd gear, and no overdrive, sounds like the transmission has defaulted to 2nd gear start. There can be many reasons for this. From a blown fuse, to an internal transmission problem.

With the engine misfires, that may be causing the transmission problems. The only possible thing i can think of as to why the misfire goes away after removing the radiator cap, is that you have a head gasket or intake gasket problem. Releasing the cooling system pressure would likely stop coolant form getting into a cylinder because of one of these problems and make the misfire stop.