2000 Pontiac Grand Prix
3100
Trac control
GM tech = jk
question = Grand Prix will not shift into any gears unless something is
shoved into the shift release, then traction control light is lit up,
now my ac is blowing freon out every now and then when it builds up
pressure. Some one said PCM but i cant find a replacement only
updates????


JK:
Sounds like you have several different things wrong.
Be sure to check all fuses for the shifter problem. If OK, you may have a
sticking shift release solenoid. Having pop or some other liquid spill in the
console will cause a solenoid to act up.
The traction light may be related to this, but is more likely an ABS problem.
The powertrain, ABS, and Body controller need to be scanned for codes.
The A/C going on and off is usually caused by low freon charge.
ABS / Anti lock brake warning.
 The anti-lock braking system (ABS) uses several sensors, motors, and a  computer in conjunction with
the normal braking system.
 The
ABS regulates the brake pressure in order to reduce wheel lock-ups.  Reduced wheel lock-ups
improve the driver's control of the vehicle during  braking.
 Improved stability and steering enable greater control of the vehicle in the  case of an abrupt stop.
The ABS operation is available from 5 km/h (3 mph) to the maximum vehicle speed.
A warning light means a problem was detected, and the system needs to be  scanned for codes in order
find out the area the fault is in. With the light on,  ABS operation is not present, but normal braking is.

The
Traction Control System is controlled by the ABS system.
Pontiac sunfire 2001. Warning lights = trac off
Question = when the trac light comes on the transmission gears shifts hard into gears.


Answer: That is a normal operation of your vehicle. When the trac light comes on, it is due to a loss
of traction, usually due to wheel spin or heavy acceleration. That will usually make the transmission
shift hard anyway. If there is a problem, the light will stay on all the time, usually accompanied by
the ABS light as well. That will mean there are codes stored in the system and you have a problem.
If the lights aren't on all the time, I would just recommend checking the trans fluid to make sure it is
full and not burnt smelling or black in color. You might want to try a transmission flush too, if you
haven't done that in a while or ever.