Autotrans will not shift when floored! help please! -

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post #1 of 4 Old 09-15-2009, 06:15 AM Thread Starter
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2004 TJ Wrangler 
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Location: Harrisburg, PA
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Autotrans will not shift when floored! help please!

Recently, I have been experiencing that "rattle" that we all know
happens at idle in a jeep. I started noticing it a little more, and some
wierd sounds in reverse, but no huge deal. Today, I was getting on to
a ramp on my way to work, didnt even floor it completely, and my
tach went pretty high, to about 4 or 5, but would not shift. As I said,
I have the auto trans, which has always been decent for me, but not
today. It kept revving, so I layed off the gas while the check engine light
blinked on and off repeatedly. It eventually went off and the jeep shifted
fine the rest of the way. Anyone else ever have this problem or know what
it could be?

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post #2 of 4 Old 09-15-2009, 06:32 AM
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Is your trans fluid full?
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post #3 of 4 Old 09-15-2009, 06:34 AM
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Go out to the Jeep, put the key in and turn the key to ON, then OFF, ON, OFF, and then ON fairly quickly. The odometer will display the error codes which you should write down and bring back to post here if any.

Sounds like the transmission was stuck in second gear which is the default gear when the transmission has an issue.

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post #4 of 4 Old 09-15-2009, 06:56 AM
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x2 on read code.

also make sure your fluid is full. the 42RLE auto is picky about getting its filters and fluid changed every 30k.

also you often need to completely let off the gas to get the 42RLE to shift out of 2nd when pulling onto the highway in 4k range, then it will drop right into OD unless you have the OD OFF button engaged.
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