Question about 2002 Jeep Grand Cherokee

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When Jeep has beenparked over night and it is a cold morning (45F or 5-6C) the auto box will not change gear. Have to turn off engine and use manual mode. All okay after 1-2 miles. Gearbox has been changed but fault persists. Any suggestions?

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Likely there is some amount of varnish in the transmission. If the oil was recently changed, it may need some time to dissolve. I do not like using any solvent based cleaners as besides freeing the valve, they can degrade the internal clutches and often will dissolve too much varnish all at once and cause other larger problems. You could try using something like Lucas conditioner. That will not harm anything. It takes time for varnish to build up...it takes time to remove it. Worst case is that you will need to have the valve body removed and manually cleaned. It's expensive but not as expensive as a new unit.

Posted on Nov 18, 2009

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