Chevy Cavalier trac off light

Tiny
HMAC300
  • EXPERT
This can be a pcm problem or abs or both or s hort in wiring. Have apro check this as you won't be able to get rid of this code.
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Friday, December 16th, 2016 AT 4:38 PM (Merged)
Tiny
JRR1820
  • MEMBER
  • 2004 CHEVROLET CAVALIER
2004 Cavalier, 94,000 miles, 2.2 L engine, auto trans

Where do I begin.

ABS, Trac Off, and Service lights are on 90% of time. This has been happening for a year but car didn't start running badly until three weeks ago. The code shows a bad speed sensor on wheel bearing. The couple of times all three aren't on the trac off light goes on and off every minute or so.

About 25% percent of time car dies or nearly dies when put in gear.

When air conditioning is running, after about ten minutes of driving car starts to jerk. It feels like I'm tapping the brakes while I'm on the gas. Once it starts jerking it does not stop even if I turn the air conditioning off. It has to sit for a couple hours before it will stop. Also, engine light comes on 25% of time and now the brake light comes on about the same time it starts jerking. Just discovered today that cruise control works intermittently. Runs fine on 50 minute drive to work without a/c on.

Fuel injectors have been cleaned, spark plugs changed, and alternator checked since this started about three weeks ago.

It has been to a mechanic several times in the last few weeks and the only codes that show are for the speed sensor on the wheel bearing.

Any thoughts would be appreciated as my mechanic has given up.
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
E40WATER12
  • MEMBER
Well the speed sensor is the problem, Thats located near the tranny area. When u replace that, It should correct all youre problems

Good Luck.
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
MECHIA821
  • MEMBER
  • 2002 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 86,000 MILES
Computer problem
2002 Chevy Cavalier 4 cyl Front Wheel Drive Automatic 86000 miles

once in awhile my trac light comes on and check engine light my car starts jerking like its gonna throw you out of it I have to pull over because it wont take no gas at all and has no power I shut it off and restart and it runs real good after that until the next time it could be 1month or a couple of weeks before it does it again
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
Should and have to get the codes
PCM will store a history of what is happening
and when you get the codes
it will help in diagnosing the problem
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
MECHIA821
  • MEMBER
We had it put on a diagnostic machine everything is showing okay
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
If using an OBDII reader will not help as this will only give you the present codes
and since you don't have check engine light on all the time this will not detect any faults
if you are to use this OBDII reader you have to scan when check engine light on
need to have it scanned with a scanner it will give you more options as to look up history and different modules readings and codes
good luck
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
BKOLTON
  • MEMBER
  • 2000 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 76,000 MILES
Brakes problem
2000 Chevy Cavalier 4 cyl Front Wheel Drive Automatic 76000 miles

Does this sound like an emergent situation? There are also vibrations in my pedals like the ABS are kicking in, but I am accelerating, not braking. Within the past couple days I have had an oil change and a fuel filter replaced.
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
RHALL77
  • MEMBER
If you can, I would suggest having the car scanned and find out what codes you have in the system.
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
BKOLTON
  • MEMBER
I did have the car scanned and actually there are no codes registered for any of the lights. He also did a systems scan and all systems passed. Is it possible my ABS sensors are to blame? The pedals occasionally vibrate and thel ights are on, but other than that it runs and brakes just fine.
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
ROMIN00
  • MEMBER
I have the same problem as bkoltons's, me to I couldn't find what is shaking and vibrating my pedals, if you solved a problem please write about it.
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-1
Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
DPCONST
  • MEMBER
  • 2000 CHEVROLET CAVALIERCHEVROLET CAVALIER
We have a 2001 Chevy Cavalier Z-24 with 100,000 miles and a 2.4 liter engine. 150hp.

We have installed a new speed control sensor hoping that it would fix the occassional jerking and hard shifting that the car does at about 40mph. The TRAC light is on when this is happening. Unforturnately, the sensor helped for about two weeks and it started happening again.

We also pulled the codes and there are none present.

Any ideas?

Thanks for your help! :D
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
JACK42
  • MEMBER
Need to scan it when it is failing to get a code. Could be many things. You could test the resistance across the wheel speed sensors to see if any one is different
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
RUPEKAED
  • MEMBER
I had similar problem on 2001 cavalier. Trac off light was on and it hard shifted into drive at start. Replaced throttle position sensor and it corrected problem.
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Friday, December 16th, 2016 AT 4:39 PM (Merged)
Tiny
CAPTAIN161
  • MEMBER
  • 2004 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 21,000 MILES
Electrical problem
2004 Chevy Cavalier 4 cyl Front Wheel Drive Automatic 21000 miles

Will the ABS sensor create the above problems?
Also the speedometer isn't registering but all other guages in the instrument panel function without problems. The only info I have run across says something about ABS sensors.
Hope you can help
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Friday, December 16th, 2016 AT 4:40 PM (Merged)
Tiny
MMPRINCE4000
  • EXPERT
Have the PCM scanned with an ABS scanner, most DIY scanners only scan the PCM. You would need a chassis scanner. Hopefully it is just a wheel sensor.

The speedometer problem could be the speedometer sensor or the gauge itself. A portable scanner will tell you if the PCM is seeing speed (MPH).
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Friday, December 16th, 2016 AT 4:40 PM (Merged)
Tiny
DONIADAMS
  • MEMBER
  • 2001 CHEVROLET CAVALIER
  • 11,300 MILES
The abs, trac off, and wrench light are on. Which is a abs problem and its a rear sensor but inhave replaced both sensore and the harness on the axel and still on. What eles could it be?
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Friday, December 16th, 2016 AT 4:40 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Have the diagnostic fault code read and erased.
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Friday, December 16th, 2016 AT 4:40 PM (Merged)
Tiny
DONIADAMS
  • MEMBER
It comes right back on as soon as earsed
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Friday, December 16th, 2016 AT 4:40 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Couple things to consider. First of all, fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. In your case, replacing the sensor and the wiring harness would probably solve that code 80 percent of the time. You also have to consider a computer problem, or more commonly a corroded connector pin or break in the wires anywhere between the sensor and computer.

The second thing to be aware of is there is one model of scanner that has a mistake in the software and it reads codes and data for the wrong wheel. It seems to me that was on a GM truck but I can't remember for sure.

You can use a scanner to view live data during a test drive. That will allow you to see the wheel speeds the computer is seeing. If they all seem to be correct, suspect a cracked tone ring. That will cause one extra pulse per wheel revolution which will set a code. I can not find much information on ABS for your year and model so you'll have to see what kind of tone ring is used. GM used a lot of speed sensors built onto the backs of the wheel bearings as an assembly. Those give a lot of trouble when a little, normal play develops from wear. The dealer's scrap metal bins are loaded full of them. It is not uncommon to have problems in as little as 15,000 miles. If your car has a normal external tone ring like everyone else uses, you can look at it to see if it is cracked between two teeth.

Another approach is to go right to the ABS Computer, disconnect the plug and measure the sensor's resistance right from there. You'll need the service manual diagram to figure out which two wires to measure across. A typical sensor will have somewhere around 500 to 900 ohms of resistance. If it's higher than that, or you find an open circuit, measure right at the sensor. If it's okay there, you have a break in one of the wires going to the computer.

You can also measure the AC voltage at the connector that is developed when you spin that wheel by hand. The voltage isn't accurate but all you're looking for is something vs. Nothing.
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Friday, December 16th, 2016 AT 4:40 PM (Merged)

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