Last post on Nov 02, 2012 at 5:41 PM
You are in the Chevrolet TrailBlazer
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Chevrolet TrailBlazer EXT, Electrical, Transmission, SUV
#1 of 280 Trailblazer Speedometer
Oct 27, 2006 (3:29 pm)
I was driving I-70 the other day, looked down and noticed that my speedometer showed well past 120MPH when I obviously was not going that fast. I pulled over, stopped the truck, and my 0 speed was shown as 90MPH. I turned off the key thinking that the system would reset, and when I turned it back on I seemed to gain back about 5MPH, so my 0 speed was now shown as 85MPH. Over the next few days it eventually got back to 0MPH through normal usage and it's been okay since. I recently when on a long trip that was about 90% cruise control and had no problems. Any ideas what the problem was and my chances of having this recur?
#2 of 280 Re: Trailblazer Speedometer [jmaher]
Nov 28, 2006 (2:35 pm)
My wife was driving our '03 Trailblazer LT (52,200 miles)when the speedometer showed her doing 110 mph. Had to wait a week be finally took it to the dealer. The dealer told us that it was the motor in the panel and the panel would have to be replaced. At the same time we where having problems with the AC/Heat fan control (wouldn't work on 5 occasionally) and was told there was a short in the Fan Control Module. Total repair bill for both, $649.02. GM Service told me that I have to pay for the repairs as I'm out of warranty. Thing is, I've had it in to 2 different dealers on 3 separate occasions for the fan and they couldn't find the problem. Now that I'm out of warranty they won't pay for the fix. Convenient, huh! Speedometer fails at near 50,000 miles and they donít take responsibility let alone failures during warranty. Criminal. They know there's nothing the average Joe can do. My suggestion, save your self the aggravation and buy something other then a GM product.
#3 of 280 Re: Trailblazer Speedometer [jmaher]
Nov 28, 2006 (2:48 pm)
I have been having the same problem but with my tach., It would read higher than the rpm's of the engine and never go back to "o" when the engine was shut off. I've tried disconnecting the positive on the battery to reset the computer,This worked one time and now the gauge stays up at around 7000 rpms. I've replaced the fuse and that did not solve the problem. I have a 2004 TB-EXT/72K and the only other problem was when the cruise control would not work while on a trip,but when I stopped for the night it was ok the next day. I think its in the multi function column but the garage is puzzled.
#4 of 280 Re: Trailblazer Speedometer [marty11]
Mar 09, 2007 (9:19 am)
My 2004 is having similar problems except my speedometer and rpm both show 0 in the cold weather and won't start working until the weathers about 60 degrees. From what I've read it has to do with the cluster but I'm going to complain to chevy and see if I can get them to something about it. My husband works at a car place and says lots of chevys have problems like this and it would really help if I could get people to tell me if they have problems when I write to chevy. Thanks
#5 of 280 Re: Trailblazer Speedometer [manda2]
Mar 29, 2007 (7:02 pm)
I work in a GM dealership, in the parts dept, and we replace abot 10 instrument clusters a week. They are expensive (300-500 dollars just for the cluster, depending on model), they are annoying, and they are JUNK. And there is really nothing to do but replace them when they go bad.
And if you are out of warranty, throwing a fit in the service dept. won't get it fixed any cheaper, I promise you.
#6 of 280 Re: Trailblazer Speedometer [manda2]
Apr 13, 2007 (12:10 pm)
I've noticed when the weather is cold my 2004 TB's speedometer will either read 0 or it will shoot up to 90mph and will stay there but as the weather warms up, it will eventually reach back to 0mph. The first time I noticed this, my car was at 55K miles. The second time this happen my car was at 57K miles. Both times this happen it snowed in my area.
Talked to a guy that used to work at the Chevy service department and he said that it was a common problem with 04 Chevy's. The speedometer cluster can cost between $300-500 to replace. The cheapest I've found online was between $175-280 (doesn't include labor).
I've been searching online to see if it was a recalled product but haven't found any info yet.
#7 of 280 Re: Trailblazer Speedometer [goodgirl71]
Jun 08, 2007 (1:10 pm)
Unfortunately, Chevy made a poor decision with their choice in their instrument panel. My mother, who drives an '03 Suburban, and myself (an '04 trailblazer) both lost our speedomters between 39k-41k (I am wondering if Chevy has done this on purpose, it seems to go out as soon as your warranty expires). I have since lost my RPM too. There is NO recall on this item, and yes, the cost is $300-500 depending on the dealership. I have driven many cars (and Chevys) and have never seen the issues I have seen with the newer model trucks and SUV that Chevy is producing. It is a tragic disappointment to our American Made motor company that is going to cost them dearly in the long run....
Not a fan of Ford here but at least they acknowledge and correct their errors....Unlike Chevy.
#8 of 280 Re: Trailblazer Speedometer [dhamernik]
Jun 08, 2007 (1:11 pm)
P.S. It truly has nothing to do with the weather, I am in Southern California and some days my speedometer appears to be close to accurate, other days it points STRAIGHT DOWN! Weather could be the same, it doesn't matter.
#9 of 280 Re: Trailblazer Speedometer [manda2]
Jun 08, 2007 (2:35 pm)
Hi manda2, First it was the tach, Now it's the speedometer. Went crazy for about 2 weeks and now it works fine. Waiting for the next time for it to go out. Again the garage can not figure it out, They just want to replace it. The hole cluster. The way it looks now the rest of the gauges should start acting up. The temp. out side was in the 50's when it went out.
So I'm still confused and waiting on a good reason to replace the hole cluster
It has to be something stupid thats causing this to happen.
Good Luck/Let me know
Jul 29, 2007 (3:17 pm)
in response to speedometer cluster problems, it seems to be a big prob with chevy trucks & suvs. The prob is a stepper motor that is behind instrument panel, one for each needle.
I fixed my own cluster with one i bought on-line for about ten bucks and a soldering iron. The guy will also rebuild it for you if you aren't confident to do it yourself. Look under "stepper motor for (your vehicle)speedometer cluster"