My gas gauge is on empty when I start my car, the it moves to full like normal, but it stays on full never moves until I shut the jeep off then it goes back down to empty like normal. Also tried looking at the gallons left until empty and it is at 378 and it goes up to about 381 then comes back down again. I probably have about 1/2 tank of gas. If anyone can help. Thanks
SOURCE: Gas Gauge Problems
You will have to get the error code before the engine light goes back off. You can do this by inserting the key into the ignition, then turning the key key to the on position three times with in 5 seconds. Remember this is the on position no the start position. Once you have done this the odometer will show the error codes briefly. They will look like this "P0202, P1225, P1400. Make sure you write them down because they can go pretty quickly. Once you have the codes go to the link listed below. It will give you a brief description of what the codes mean. If you need any thing else just let me know and I'll try to help.
The first link will have jeep specific codes, the second will be codes generic to all manufacturers. Just scroll down until you see the code listings.
Good luck.
http://www.obd-codes.com/trouble_codes/dodge/
http://www.obd-codes.com/trouble_codes/
SOURCE: OIL GAUGE GOES DOWN AT STOPS
I had the same problem with my 97 Wrangler 4.0..Change your antifreeze, replace with some new 50/50 mix...Also chanke your oil, replace the filter with a mopar filter and use stratght 30 weight motor oil...Solved my problem
SOURCE: Jeep Grand Cherokee Service engine light soon on
A loose gas cap will sometimes trigger the service light to come on. Since this appears to have happened on multiple occasions I can assume that this is not the problem but may be associated with it. The level of gas in the tank affects the amount of atmospheric pressure in the tank. There are multiple things that could set off the light, one being a loose or defective gas cap, and the other is a fuel vapor return valve. I'm not sure of the exact type of fuel system you have so I cant give a more exact answer. If you wanted to give something a shot before bringing it into the shop, you can simply replace the gas cap first, a very cheap try.
SOURCE: 1993 Jeep Grand Cherokee gas gauge reads empty but tank is full.
Fuel level sending units are known to go bad on these.
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
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