Question about 2001 Pontiac Grand Am
Daughter driving to job this morning - going approximately 60-70 mph. Cruise control was on then turned it off - not sure if she turned it back on or not. Car's RPM's took off and car kept accelerating - removed floor mat, tried braking didn't do anything - put car in neutral and applied brakes - RPM's continued to get louder and applied brakes and car didn't stop - downshifted - RPM"s continued to increase and applied brakes car didn't stop - finally put car in neutral again and applied brakes for 20 seconds and got car stopped. Pontiace dealer said they can't find anything. Temperature was about 10 degrees - had driven about 20 miles - car had sat since Friday night. Car is kept well maintained. What can else can we tell dealership to look at?
Brake switch is designed to shut cruise off when brake pedal applied, sounds like a defective brake switch, because when she applied the brakes it's supposed to cut power to cruise module, so either that is problem or your throttle cable had iced up and or both
Posted on Jan 22, 2013
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Posted on Jan 02, 2017
SOURCE: YESTERDAY, I HAD HARDLY ANY
If your vacuum line to the brake booster went bad, the brakes would be really hard, but that does not explain the car accelerating. Better check the return spring on the throttle, unless you were using the cruise control. If the cruise control was on, you may have a problem with the brake switch above the pedal, which should have turned the cruise off. Please let me know if you have more questions, and thanks for using FixYa.
Posted on Apr 18, 2011
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!"
SOURCE: My 2002 grand prix has
What you are experiencing is this.
Your computer in your car runs on "Drive Cycles". Each separate time you start your car you enter a new drive cycle. In order for the Evaporative and the Oxygen to activate the drive cycle must be long enough and far enough to get all the systems up to the right temperatures. This could take up to 15 miles of continuous driving.
What your problem sounds like is you are not driving your car long enough the very day you have it inspected.
What you did last week cannot effect a new drive cycle today. For each cycle is independent of the others.
Try driving it longer than you have in your previous attempts of inspection.
Posted on Jul 01, 2011
im not sure what type of noise your hearing but something similar happened to my car while i was driving i couldnt figure out what it was it ended up being my calipars they were bad and they were grinding on the rotors causing this screching noiseon and off while i was driving.
Posted on Oct 19, 2012
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