2005 ENVOY speedometer working sporadically. gas gauge acting same way and now oil gauge is starting to act up also! could this be the cluster or a ecm problem?
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This is a common problem with this make and model. The problem could be the instrument cluster itself because they are not made very sturdy. They also can have parts on them that fail like capacitors. Then some of them can have problems with grounding connections at a common point called the bus. You can send the unit in and have it redone by people that specialize in this problem or you can order a new instrument cluster.
My gauge started acting funny. When filled it would go to zero, come up to normal and then go back to empty. It was the fuel sending unit and GGMC has a bulletin on it, It cost me $128.00 at the dealers
Pretty common issue with the 03-06 Trailblazers. What happens is the motor behind the gauge wears out over time, eventually more gauges will stop working or start acting crazy.
Sounds like you have a instrument cluster going bad,but I have repaired some concerns like this at the dealership with a reflash downloaded by there Tech2.
Is it ALL of the gauges? My wife's 2005 Envoy Denali had a problem with the gas gauge sending unit (in the tank) that made the gauge act erratic. Also, the check engine light would stay on alot. If it is all the gauges, then it may well be the dash unit. Hope that helps some.
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