Question about 2002 Chevrolet TrailBlazer

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Cam shaft sensor & air conditioner

Check engine light on. Was told it was camshaft sensor.
Also if AC is on when I'm at stop the suv dies on me. Is this caused by a bad cam shaft sensor?

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  • gwenevere198 Aug 14, 2008

    I have a 2003 with the same problem! I took it to the shop and they told me it was cam shaft sensor. However, the check engine light went off and the tech couldn't get the truck to repeat the problem. So, they told it might have just been a glitch. I took the truck and nothing happened for two weeks. Then all the sudden the check engine light came on again but the truck didn't stall. When I took it back to the shop the check engine light had gone off again but the same sensor error was stored in the computer. The tech found out that the check engine light will reset itself after the 3d consecutive startup if it does not detect the problem. So yet again I took the truck home and a week passed with no problems. The check engine light just came on again. I don't know what to do. Any ideas?

  • Anonymous Aug 29, 2008

    Check engine light on. Had it fixed at dealer. Went off. Came on again. Still on. Also if AC is on when I'm at stop or drive slow the suv dies on me.

  • Aircraft800 Sep 03, 2008

    Wow! I've got a 2002 Trailblazer with EXACTLY the same problem! It also dies once and a while after being at highway speeds, then coming to a complete stop. I had my neighbor read it, it shows the cam shaft sensor. I've got the new sensor on order, I hope it fixes the problem!!

  • jcknbl05 Sep 04, 2008

    I have a 2002 trailblazer that idle's rough when A/C on. The engine surges and the r.p.m flucuates, when the a/c is on. With the a/c off it runs fine. I checked batery and charging system it checks OK.

    Check engine was on,, now it is off.

  • Anonymous Dec 06, 2008

    hahahahaha my 2002 trailblazer with only 57,000 miles in it and i a the original owner, meticulously maintained. within the warranty, i had the ignition switch go out, leaving me stranded for 5 extra days on a two day vacation. I have also, post warranty, replaced the fuel pump, the fan clutch(to resolve engine racing like Seabiscuit on startup) and now....drumroll please....i drove 1 block on my lunch break to mc donalds and with no prior trouble/warning the idle became so rough the whole car shook violently, like a heroin addict going cold turkey, and the check engine light came on. i drove the 1 block back to work to finish my shift and 8 miles home that evening. did not drive the rest of the weekend. took monday off work and drove 3 miles directly to my mechanic. the car's computer said it was a cam sensor. they replaced it. same trouble. they said they had a specialist who could look at it in two days and figure it out, gave it back to me w/assurance ok to drive 1 time to and from work 8 miles each way, after taking car back, i drove 4 blocks to pick up my daughter and it barely started, backfired in front of her school, then the cabin filled up with a horrible sulpher odor and the car got the DT's again. arranged a rental, took it back to the mechanic, said 'don't send her home til she's well' now i come to find that early expiration of these engines is rather commonplace, some with less miles than my nearly virginal 57,000 miles in 6 1/2 yrs. most people are squabbling though with the dealerships to the tune of $7k, give or take, for a not necessarily new engine. all of this made me feel considerably better though about mine lasting as long as it has and my darling mechanic giving me a steal of a used engine with 30,000 miles on it, installed, for only $2500. comes with a 6month warranty only, but that will give me enough time to find out the outcome of my union's contract negotiations and whether i still have a job past april, and if so, the b**ch should still be running well enough to dump it and get a toyota or something. have had two toyotas go well over 200,000 miles each, with minimal maintenance, and were still humming along when i parted ways with them. muh-muh-muh-muh-muh, my toyota! sux too cuz this was my 2nd chevy in a row and they loved me for paying the TB off in 2 yrs from no money down and i was all fixin' to be a loyal chevy customer and now....i don't think so! sayonara big 3!

  • Anonymous Mar 23, 2014

    check engine light is on and it showing cam shaft sensor

  • Anonymous Mar 23, 2014

    they are bad

  • Anonymous Apr 01, 2014




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I replaced the Cam Shaft Sensor. I also cleaned the Throttle Body with carb cleaner. I had my wife hold down the accelerator, while running I sprayed down the throttle plate and the entire area around it. Now my TB finally idles smoothly, and it hasn't died yet!! Check engine light is gone and I passed the emissions test!! Yea!!!

Posted on Sep 15, 2008


I cleaned the throttle body with carb cleaner and an old thooth brush. Wiped out residue with a clean wrag.
That seems to have stopped the rough idle problem.

Posted on Sep 17, 2008


Try your oxygen sensor my 2003 was doin the same thing and i changed it and it quit and has not done it again since

Posted on Sep 15, 2008

Hope you find out the problem I have a 2005 trailblazer doing the same thing.

Posted on Aug 22, 2008

  • neverbuyache Jun 15, 2011

    I've been fighting the same problem for the last year plus. In time you will likely get a trouble code setting off the check engine/service engine soon light. The trouble code will be for the cam shaft position sensor and the crankshaft position sensor. I was Unfortunate enough to bring it to the wrong dealer for the first 3 tries to fix the problem and got ripped off. With research on line and talking with several mechanics I was told and found out one sensor will set off the other and both will need to be replaced. They are not too expensive, 80 U.S. dollars for the two parts. After the sensors are changed the PCM will need to "relearn" the timing of the engine. This almost has to be done at a GM dealer, and cost about 80 U.S. dollars. Total time to replace both sensors should be 1/2 hour. The cam shaft sensor is very easy to change, the crank shaft sensor is a bear to get at. I choose to change the cam sensor myself, but couldn't reach the crank sensor. Change both sensors and have GOOD DEALER relearn the computer system. Mine seems to be working for now, best of luck.


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The vehicle will not run without a camshaft sensor and if it is failing these are the problems you would get. The intermittent problem is always hard to say for sure but if that is the code that was stored in the computer I would replace the Camshaft Position Sensor.

Posted on Aug 16, 2008

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