Question about 1999 GMC Jimmy

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Transmission 1999 GMC Jimmy

Trans Is not changing gears unless I take foot off gas pedal. Need help?

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One of the solenoids are bad...or you might actually have to replace your TPS...not TRANS related!

Posted on Dec 17, 2009

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Modulator Adjustment, Trans repair shops will tell you that you need it rebuildt just be FIRM and Ask for a Service and Adjustment
may involve 1 part

Posted on Jan 13, 2009

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"...he had to put hi foot on the gas pedal several times..." I do not understand what this means, but does it still fine? If it is then you likely had a stuck shift valve, but why is the valve stuck? Is the valve body contaminated as a result of the trans "coming apart". If it is still not shifting out of second gear then you may have a 3-4 clutch problem, which is a very common failure and requires overhaul to correct it.

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1 Answer

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Best thing to do is get the ECM on the jimmy scaned for codes. I believe Auto Zone will scan for free and some transmission shop as long as there honest will scan the ECM too and let you know what you realy need.

The ECM controls the transmission and if there is any conflicts between the transmission or engine the Jimmy will go on a limp mode and your transmission will not shift to OD and may seam to be slipping.

If it is a transmission problem the scan will pick it up, same as to if it's a engine problem.

Good luck and hope this helps, Just trying to save you some money by finding out what is causing the problem.

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