Question about 2003 Jeep Grand Cherokee
You don't need to go by auto zone to have codes check ! Chrysler , Dodge and jeep vehicle's can be checked without a scanner ! Turn the key on then off then back on then off again an then on an leave it on . Check in the odometer an it will show P codes ,then it will show done !
What size engine does it have ? 4.0 or 4.7 L
Fuse #17 10 amp located in the junction block powers pin #16 at the DLC . This would power up a scan tool . Not a PCM fuse !
Your vehicle does not have a separate control module for the transmission ,it is part of the PCM - powertrain control module !
Jeep vehicles with stalling an idle going high then low ( surging ) is caused most of the time by a bad TPS - throttle position sensor ! An don't use one from the aftermarket , use factory parts !
Posted on Jun 02, 2017
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Posted on Jan 02, 2017
Replace the Transmissions Control Module (TCM) that mounts on the driver's side firewall. I have had to do this twice with mine. Glad the TCM was under warranty.
Posted on Mar 09, 2009
It could be lash in the differential which is normal, but it could also be a loose u-joint in the driveshaft. Check the rear driveshaft u-joints.
Posted on Mar 12, 2009
Poor grounding can cause many of the conditions you have listed. When checking power with a volt meter, this goes unnoticed because the meter does not draw enough amperage to cause the bad connection to break contact. Your battery is grounded to the engine block and also has a small lead to the fender. Many components have individual ground leads as well (including most computers) I would check all ground leads and clean the contact surfaces with sandpaper or a wire brush. Adding an additional ground wire is a good idea as well. Don't forget that the dash board frame must also provide a good ground as well.
Many times this is all you need to do...sometimes though, control modules can be damaged because in having a partial ground, they build up heat, due to additional resistance in the circut.
This may or may not cure your problem, but it's worth checking out. Grounding is often overlooked, especially if it has not completely broken down.
Posted on Apr 23, 2009
SOURCE: jeep wrangler bucking
how long has this been happing..one tank of fuel or more, could have been bad gas, replace filter,, put gas dryier in fuel tank..if it continues could possibly be transmission related..the reving down doesn't sound like transmission though if tansmission was slipping it would rev up..good luck
Posted on Jun 02, 2009
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