Question about 1998 GMC Sierra
This problem has been a pain to diagnose but when the gauges stop working the transmission shifts into overdrive and will not shift when the gauges start working again the transmission also starts working again
Sounds like a "ground harness" issue. Most likely a common ground for the cluster and TCM.
Posted on Mar 20, 2014
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Posted on Jan 02, 2017
I would start with a transmission fliud and filter service.
I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.
Posted on Aug 16, 2009
Testimonial: "Thanks alot richtko94'! I'll try that!"
SOURCE: My 2001 GMC duramax with
Thanks for choosing FixYa and welcome to the site. The first thing you need to do is check your transmission fluid. Make sure it is at the correct level. You may need to change the fluid and change the filter. If you haven't did this, I would advise you to do it. You would be surprised to see the difference, if that is the cause. It is very hard to diagnose a transmission problem because there is no way to find out other then taking it apart. It could be damged teeth, seal, ect. It is possible that you have a bad torque converter. But the only way to know for sure is looking at it or having a mechanic look at it. Now, the transmission should throw a fault code. If your check engine light is on, this may be the reason why. If so, you need to take it to Autozone or Advanced and have the codes read. It may tell what is wrong. If there is no check engine light, it is possible that you may just need a fluid change. I would change the filter and fluid first. Transmission maintenance can be very expensive. Shifting can become hard if there is low fluid or you need a new filter. Pay attention to the housing and see if it is leaking any fluid. This could be a sign of a bad seal. The transmission also has sensors that can fail. If the fluid change doesn't help, your only option is taking it off yourself or haing a mechanic do it for you. This is just one of those things that you need a hands on experience to know the exact cause of your problem.
Posted on Jul 25, 2011
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