89 chev truck 1500 4X4. Speedometer only works sometimes.
Speedometer works only dometimes...I can hit on the dash a couple of times and it will pop up. Other times, it will quit working while driving. I also can hit on the dash a couple of times and it will pop up again.
HAve replaced the speedometer and a sensor at the back of the transmission that a GM parts guy told me that it needed. Did not fix the problem either....HELP !!!!
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If only the speedometer is inop, it will 90% of the time be a speed sensor. 1 10mm bolt and a plug tales 5 minutes to replace If any other issues occur it is likely In th dash and see earlier suggestions or seek a professional shop, or a salvage yard to replace the cluster . Is your easliest solutions
Usually if both the odometer and speedometer stop working, the problem is the speed sensor on the transmission. You should also have a trouble code in the engine computer. If one component works but the other does not, the problem is usually the speedometer head in the dash.
The same thing happens on my 2003 Impala. I found that my dimmer switch has an intermittent failure where sometimes the dash lights go out even with the headlights on. If I wiggle the dimmer just right, the dash, radio, steering wheel, door locks, and every other light comes on (when the headlights are on). My fix was to mount my Garmin on the steering column in front of the speedometer so when the lights go out I know how fast I'm going. A replacement dimmer (or bypassing the current one and adding a resistor) should take care of it.
This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems. And where you can purchase replacement parts on Amazon if you want to do the repair yourself. Trailblazer Speedometer
We had the same problem with our 94 DX. It turned out to be a bad connection in the instrument cluster connector to harness connector . Try hitting the top of the dash while driving when the speedometer is not working and see if it starts to work while you're hitting the dash . If it does , you probably have the same problem we did . I pulled the instrument cluster and disconnected the harness and I bent the connector terminals with a small screwdriver so it would make a better connection . It worked .
The speed sensors will not fix it. This is something that these cars will do in hot weather. The instrument cluster need to be removed and the contacts from the printed circuit to the connector need to be cleaned. Over time they will lose contact and affect the fuel gauge or speedometer. You may have to replace the speedo cluster. Sometimes if you hit the dash just above the fuel gauge it will start working too. Been there done that, fixed mine as the printed circuit was coming apart at the harness connector.
the dash clusters in the 03 -07 chevy 1500-6500 trucks have issues with their motors that are in the cluster. they work then don't, stick, jam, reset, etc. GM has a recall on these if your truck is privately owned and under 125000 KMs, Just contact the dealer to start and ask if you truck is included in this recall. If it isn't then you might want to find someone to repair it. we repair these unit often. good luck to you
It can be several things. Te simple one is that the connector behind the cluster is loose. The other is the circut board that makes up the cluster is going bad. Try disconnecting the cluster and re connecting. If this does not work, try replacing it with a sed one from a salvage yard or from ebay.