1998 Pontiac Trans Sport. Changed the transmission fluid  filter several years ago. Added Lucas
transmission treatment.
Question: The transmission sometimes comes out of gear while stopped at a traffic light or stop
sign. It is very random. It may not happen for several days or weeks and sometimes it can happen
twice in one day.

When the problem occurs, it sometimes takes a minute or two of shifting back and forth from Drive
to Park to Drive before it starts going again. The transmission never slips or comes out of gear
while the van is moving. It only seems to occur after the van stops at a stop sign or traffic light.

First, be sure to check fluid level and condition. There is nothing external or electrical that can
cause this. May have a problem in the forward clutch, forward band apply, or a rolled seal.In any of
these cases, removal and disassembly would be needed. May be time for an overhaul.
You could try to have a transmission flush service done and see if it helps.

2003 Pontiac Grand Prix Check Engine Light code transmission P0753.
Question = I have a 2003 Pontiac Grand Prix with 84,000 miles on it. My Service Engine Soon light
just came on about a month ago and when it did my cruise control stopped working as well.

I can feel it has trouble shifting and I have hooked it up to a machine that AutoZone has to check my
problem and it says its a transmission module (P0753).  We have asked others who say that it
probably isn't the problem because they have never heard of one of those going out and it's
probably a wiring issue. Can you tell me what you think it might be?

This codes refers to the 1-2 shift solenoid. Be sure to check all fuses first. Specifically the
"TCC" fuse in the underhood fuse block. If that is ok, 2 things possible.

Either you have a connector problem at the 20-way transmission case connector causing this code,
or the solenoid. The solenoid is on the valve body in the side case of the trans. Suggest
disconnecting transmission connector with key off, look at all terminal, pull the harness a little so as
to change its position, then plug it back in. Clear the codes and drive it.

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Pontiac Transport Shifting Problems And Code P0753