3rd Dec 2007, 19:09

My 2003 Trailblazer LTZ starts a funny problem every year when it gets cold outside (we live in Utah). 53,000 miles on vehicle. Whenever I need power (for example; passing or getting on the on-ramp) I get a Service Engine Light and a Reduced Engine Power light. Maximum speed she pulls then is around 16 mph. Imagine pulling onto a busy freeway and having this happen.

When I pull over and restart the truck, she runs fine again until I need power. After two shops put their computers on it, they could not fix the problem. Last hope was going to the dreaded dealership service guys with the codes from the other shops (2x diagnostic at $75.00) before even getting to the dealership: ouch! The guys had it today for about seven hours and finally tracked the problem down to a "bad APP Sensor" (Accelerator Pedal Position Sensor). $345.00 plus labor. First thing I did was check for TSB's on it; nothing. I also checked an aftermarket parts store for the part. I wanted to see how outlandish the dealership price was; $59.00 and change on their site. I am still trying to decide what to do.

The Chevy or GM part # for that sensor is 15150990 (if you may be trying to solve a problem on yours). It hasn't started the dreaded ignition stuff yet, so keep your fingers crossed. If you are looking for that sensor and have the same issues as me, check out www.rockauto.com and punch in the part number you need. I do a lot of Internet research first, and these guys have great reviews from customers whom have purchased parts. I hope this helps. I'm wondering if I buy the part, is it something I can do myself? Any thoughts?

Good luck.

11th Dec 2007, 16:11

I also have a 2003 trailblazer and am having the same problem with this vehicle. I have owned it for a year now and I also have full power, but it just won't start especially in cold weather. How can we fix the anti- theft device and keep this from happening again?

22nd Jan 2008, 19:17

I also have an 04 Trailblazer LS. My service engine/Reduced power has been going on the last two weeks. At first I was told it was the fan clutch, with an approx. cost of $500 for the part alone. Then I was told it was the throttle body. The weird thing is they told me the OB computer would at times not capture the error that occurred so when they would hook-up a reader, there was nothing to read. I have read almost every forum out there that had people changing the Throttle body, Fan Clutch, the Brain, the Pedal Sensor, OB computer reprogrammed and finally, patching a chaffed wire. These are commonalities I have seen on all the forums, but with no pin point resolution. In all the above cases, they were either temporary fixes or the solution never worked. Has anyone had the above situation where the Service Engine/Reduced power lights come on and the engine power drops to 1/4 the horsepower, if not more, and has had a fix that actually worked? I have even read that people were pursuing the lemon law, but I just don't have the time or the money on a case that may not go in my favor. Any comments or suggestions (I know, get a new car) would be appreciated.

28th Jan 2008, 22:33

I have a 03 Trailblazer LTZ with the same problem and my best friend who also owns one that is same year with almost same miles is also having the problem. I realize all vehicles are going to have some problems from time to time, but this is crazy. I have owned the car for less than a year and already I have had to deal with multiple problems other than it not starting. I have to try and get it into a shop tomorrow and I will try what you guys are saying; thanks for all the help. The next truck I buy will not be a chevy.

7th Feb 2008, 20:18

I too own a 2003 trailblazer. I have had all the same problems, except nothing on my car starts when the battery is dead- no radio, lights, etc. I had the ignition switch replaced as there was a "bulletin" put out by GM to their service department- this wasn't for our eyes, but my mechanic copied it for me. I called GM to complain and see why it wasn't a recall- had part replaced for free, but not the labor as I took it somewhere other than a GM service station. Had a new battery replaced, car still keeps dying. The keys won't even come out of the ignition when this happens. I have my car at a GM service center now for 4 days, they can't find out the problem. I am going to have them check the anti-theft system as many people keep mentioning this could be the problem.

15th Feb 2008, 16:41

I too have a 03 used Trailblazer, and I was backing out of a parking spot and tried to put it in drive, and the car turned off and I put it back in park and tried to start it, but nothing. Then we tried to push it out of the way, and the gear was locked in park, and I had to get it towed to my home.

Like everyone says, the radio lights work and none of the gauges work, and the car will not crank. I have also changed the battery and still nothing. We have had it since May of 07 and this happened 3 days ago! For the first time.

17th Feb 2008, 12:34

I'm curious as to why General Motors Corp. isn't responding to these issues raised regarding the Trailblazer "no start" problems. I own a 2003 Trailblazer and have encountered the "no start" issue. I have replaced the battery and ignition switch. The car will be fine for a period of time and then no ignition. Everything else works. My mechanic, who is extremely experienced, can't figure it out. If it is the anti-theft device, can that be repaired or replaced? My car now has about 90,000 on it and, when it is running, works well. It is the reliability and safety factor that I am concerned with because that is the family vehicle. Runs to basketball, school, scouts, etc. Where is Chevy and GM! This is a major issue. Is GM going to wait until someone is killed when the car shuts down on a major highway and then respond to the problem?

18th Feb 2008, 13:23

I own a 2004 Trailblazer with 81,000 miles on it. On Jan 1, 2008, it just didn't start. Since then, it has gone down 5 times or about every 2 weeks. I haven't taken it to the dealership yet because of "fear of the cost".

Well obviously it's now sitting in my garage here in Wisconsin, yes it's cold, and the car refuses to turn over. Lights, radio, & controls work, but the vehicle refuses to start. Up until January 1st of this year, I had nothing, but good words for the Trailblazer, now I'm wondering.

I plan to hook up a heater in my garage here in a few minutes, maybe it will start, ha ha. I don't want to beat up GM just yet. I owned a brand new BMW for 2 1/2 years and that car was in the shop every 90 days. $365.00 for a brake job etc... So keep the faith with GM, good or bad it's our fellow citizens who need the jobs right now more than ever.

Japanese cars also break down. I had a Corolla that never worked, so have some faith in GM before they go bankrupt.