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Unread 01-18-2008, 07:02 PM   #1
Twistlok835
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Join Date: Jan 2008
Location: N.H.
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Low fuel, wont shift....

My wife owns a '99 jeep grand cherokee with an odd problem.
When the gas gets to low, and the warning light comes on, the jeep winds out in low gear (automatic) and wont shift up.
When she first told me about this, i said she was crazy. the gas gauge has nothing to do with the transmission.
It has since been proven on a few occasions. sure enough, stop and gas up, problem goes away.
We did have the pcm replaced recently. could that have anything to do with it?

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Unread 01-18-2008, 07:25 PM   #2
greasefingers
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1994 ZJ 
 
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Ok this is really weird!

Obviously for now fill up once the tank has 1/8 of a tank of gas left in it. Donít wait for that light to come on.
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Unread 01-18-2008, 10:58 PM   #3
Virmagicus
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1998 ZJ 
 
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Location: Northern Indiana
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If it were my Jeep I would not be driving it. That is a really unusual problem.
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Unread 08-01-2011, 12:07 PM   #4
scribble5
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1999 WJ 
 
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I have the same problem, had it for a few years. I have no idea how to fix it. If the fuel gets to about an 1/8th of a tank, and I switch off the engine. When it comes back on again,the automatic transmission only shifts to secnd gear. Thus I can only go 40 kilometres an hour. Very difficult to get to a gas station if it is not close. After the fillup, I am fine again. I noticed that another person here has the same problem with the Jeep Grand Cherokee 1999. Mine is also 1999.

Anyone else know about this?
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Unread 08-01-2011, 02:34 PM   #5
worsrider4047
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1998 ZJ 
 
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Location: cedarburg, Wisconsin
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I have the same issue with my niner, drives me crazy cause it won't go out of first gear till I get gas,
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Unread 01-02-2013, 05:22 PM   #6
gman846
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stuck in first gear low on fuel

I have been working on a 99 grand cherokee laredo that has this problem. When the fuel light comes on the next time I start it without fueling up first, the transmission will not upshift past first gear. Put fuel in it and it's fine again.
If I park facing up hill or lift the front of the vehicle at least 35 degrees I can then restart the vehicle and it will shift fine. By doing this I thought about the float in the tank being electrical and all. I removed the fuel tank and pump and discovered that the float had a burnt mark on the circuit board.
This leads me to believe that if I replace the float on the fuel pump the problem will be solved.
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Unread 01-02-2013, 06:01 PM   #7
Oldfrog
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Join Date: Feb 2008
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Is it because it's picking up the water in the bottom of the tank, possibly causing a misfire, then sending the signal to the tranny NOT to shift?
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