2004 Chevrolet Trailblazer EXT: adaptive cruise control problems

Filed Aug 29, 2011 · Electrical · 56,500 miles · MI

The speedometer is not registering the correct speed, jumps around while driving and has affected the cruise control. I found that this issue is the same as the federal safety agency item # 10023585 for most similar gm vehicles, but for some reason, this family of gm trucks was not included in the reported issue. When the vehicle is stopped, the speedometer needle drops well below 0 and then jumps around when the vehicle starts moving. Based on checks with our GPS, the speedometer is off by as much as 20 MPH.

Filed Jun 27, 2011 · Electrical · 95,000 miles · OH

Speedometer goes completely out, falling below zero while traveling on road, typically after cruise control has been used, multiple warning lights flash while onstar and computer showing no codes after 4x4 used. Unable to diagnose problems because problem is intermittent and after vehicle parked for several hours problem is gone. Occurs about once a week. Has caused several instances of being unable to determine how fast your traveling. 2004 chevy trailblazer ext lt 4x4 i6 engine.

Filed Jan 6, 2011 · Electrical · 116,000 miles · WI

My vehicle is currently at 116,000 miles and the speedometer and tachometer all of a sudden went to zero. It continued to stay at zero after I turned the vehicle off. The next time I drove it, it stayed at zero until halfway through my drive when now its stuck at 61 MPH, which is where my cruise control was set. The tach now works half the time but the speedometer is giving me misleading information. I live in wisconsin where the weather is such a variable. I am always using my speedometer in certain road conditions. I have certain speeds I go in certain conditions (light snow, deeper snow, rain to freezing rain, freezing rain, slushy conditions, ice, sleet and just plain normal.) consequences for not retaining the correct speeds in certain conditions in wisconsin....gee let me think....death would probably be the worst. Nothing's been done to fix this yet because I cannot afford it. It's one of those things that should just work and its a [xxx] shame gm hasn't done anything yet considering all the problems. Information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Feb 18, 2009 · Electrical · 81,000 miles · SC

The speedometer sticks. This problem started last summer (2008). I had noticed it happening after using the cruise control. I thought it was related to the cruise control and stopped using the cruise and it would still stick. Fond out it is the instrument panel. The speedometer used to reset itself after a short period of time. Now when I turn my car on it will read around 100 MPH and move up past the 120 MPH. It has been this way for approx 2 months. My mechanic said it needs a new instrument panel. I just researched on internet and I am not the only one with this problem. This is could result in an accident if someone does not realize their speed when the speedometer starts sticking. I have not had it replaced as I cannot afford it. I just gauge my speed by other cars or by the time it takes to go 5 or 10 miles when on the highway. Not good.

Filed Nov 25, 2007 · Electrical · 45,700 miles · GA

2004 chevrolet trailblazer ext speedometer does indicate correct speed. Operation is intermittent. With cruise control on, indication is from 0 MPH to pegged out, with needle fluctuating. No accidents, injuries, or speeding tickets, yet!!!

Filed Nov 17, 2005 · Electrical · 2,000 miles · MO

There has not been an accident yet, just one looking for a place to happen. My vehicle I believe has an electrical problem. Which in turn affect all functions of the vehicle, safety being one. I have had (2) fan switches go bad (2) crankshaft sensors go bad. (1) cruise control malfunction. (1) turn signal relay (1) radio console replaced for overheating (1) headlights when below 32 degrees flucuate in brightness till vehicle warms up. Dealer stated this is normal operation. Ha,ha, and transmission shifting problems (1)they reprogramed computer to solve, next some solinoid replaced and now the problem is back. I have a family of 6 that I have in the vehicle 90 % of time. I now have concerns that the wiring must have a short somewhere. Which potentially could cause a fire, or an accident due to what happens when the headlights go out or antilock brake system fails or taillights, etc. Gm refuses to replace wiring in vehicle. Gm rep told me to contact whoever I wanted to. They are not going to stand behind fixing the problem. Just keep replacing the electrical items as they go bad.