GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am sorry for the long wait
does or will the check engine light come on ?
when it starts acting up which gears will it jerk into ?
check ing. light ON
never had service
ok usually when the check engine light is on and it is doing this the code set is usually the problem causing the banging into gear as what ever is setting the code is causing the transmission to go into full line pressure by default and causing this issue
depending on what code is set if it is a transmission solenoid code being set this issue usually is a bad solenoid or very dirty transmission fluid sticking valves in the valve body which a good transmission filter and fluid change and cleaning the valve body will do the trick
if this is setting any engine codes depending on what code is set would lead us to the sensor or reading the computer is seeing that is out of spec
but most of these banging issues and check engine light transmission codes set are corrected with a filter and new fluid and cleaning the valve body
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