Question about 1999 Pontiac Sunfire
My 1999 Pontiac Sunfire GT 2.4L Automatic Will Not Start. The gear selector moves freely without depressing the brake, but the indicator shows only reverse and no mater what, the reverse lights stay on. You can push the car easily no matter what selection you have on the gear selector, but again, its reading as a perminant false reverse. The key is stuck in the ignition as well. It ran just fine earlier that day, but when i came back to my parked car, nothing worked. It seems the only thing working is the electricity/radio.
What could be the cause of this problem? How can I fix it? And, of course, how much is this going to cost me?
You car likely thinks its stuck in reverse, which it may be... even if you can roll it. you'll need to find a way to either get it into park or neutral, normally this can be done by the actual linkages under the shift console or from underneath the car.
Posted on Apr 07, 2017
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Posted on Jan 02, 2017
SOURCE: Transmission issue? Or worse?
Hello! Although the symptoms you've described could be a result of quite a few things, I have a few questions that might help determine your problem.
1) What year/make/model did the new transmission come from?
2) Is the SES (Service Engine Soon) light on? Is it blinking?
3) Was this transmission a rebuilt or used unit?
- you could have a faulty TPS - or Throttle Position Sensor.
- you could have a problem with the input shaft piston being worn. (Hence the used vs. refurb trans question). Once the inner sealing area wears it can prevent the inner lip seal for the piston from sealing properly. You may find that revving the engine up will finally get the car to move and it will BANG into gear. This is because the pump in the transmission is working harder and moving more fluid thus allowing the added fluid to overcome the leak which prevented the clutch from either initially applying or staying applied. Another area of concern that causes this is a boost valve in the valve body, not near as common but it can cause this problem on a lessor scale.
- Trouble Code P0742 TCC Stuck ON:
When this trouble code is set the pcm will command max TCC and lock adaptive shifting. This code can be broken down into three potential problem areas as found to be common in the field.
1. This problem can be a mechanical problem. Possible causes of this could be a bad or stuck TCC switch that signals the pcm of current TCC operation. Another cause though not common is a stuck TCC switch or apply valve. If it is physically stuck in the wrong position it can cause the TCC to be stuck on all the time and even kill the engine when the vehicle is put into gear.
2. This problem can be found to be an electrical problem. If the wire from the TCC pressure switch to the pcm is grounded anywhere in the path it can throw this code. This could be a wire shorted inside the trans on the internal wiring harness or the actual engine wiring harness. If the wire is grounded the pcm thinks that TCC is on when it shouldnt be and will throw the code.
3. This problem can be a hydraulic problem. This is the most common cause of this code that I have found and stems back to a clogged TCC solenoid, not because it failed. Excessive debris in the transmission or a failing torque converter lockup clutch can cause the solenoid to have debris stuck inside and this causes a restriction in fluid flow through the solenoid. If the solenoid can not bleed off the pressure the TCC can be stuck on. If the wrong TCC solenoid is installed during an overhaul this problem can also arise as a late 4L60E solenoid is identical but does not operate the same and acts like a clogged solenoid. As mentioned in problem #1 a stuck TCC apply valve is a physical problem but causes a hydraulic problem because the fluid pressure will not properly bleed off because the valve is stuck in the wrong position instead of being able to move freely in the bore of the valve body.
Above are the common causes of this code, there are other possibilities but those are what generally causes the fault. A thorough diagnosis is the only way to determine what is really at fault and a new TCC solenoid should never be assumed as the actual problem until verified.
HTH - and thanks for using FixYa!
Posted on Feb 02, 2010
Testimonial: "Excellent feedback, thanks!"
if you have the chip in the key, then this will surely help you: http://newrockies.com/vatsbypass . It was the only thing that saved my car.
Posted on Mar 08, 2010
Tip on end of park rod has slipped and is staying in the park position. Put car in neutral and get out and rock car back and forth by hand. Tip will slip out and car should move. This will not fix the tip problem as they are crimped on and the crimp has slipped. I installed a master electrical switch and never put the trans in park. I start and stop car in neutral and use switch to shut of electrical. Costs $ 800 to fix trans as park rod is last item out of trans. Cheap solution for me as car is a beater and am driving until it quits. Best of luck.
Posted on Mar 29, 2010
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