Question about 2008 Jeep Wrangler
Will not start after a short drive. The starter engages for a very short
time then just stops.
It has been looked at by the Dealer four times now and still no solution. They have replaced sensors and control modules, no luck. We just went to pick it up from the Dealer [5 Start Dealer] and it wouldn't start. They hooked up the diagnostics computer which showed nothing. with the computer still connected it still would not start and the computer did not help. We kept the key turned to the starting position and the computer showed that that it was in the starting mode and thats it. It acts like a bad battery, however, the battery is OK and ever other electrical device in the vehicle works when the Jeep doesn't start. Sometimes it takes more than thirty  tries before it finally starts. The Dealer does not know what to do.
Seen this problem before. Here is your solution im the foreman for a jeep dealership.
During cranking/starting, the ignition switch voltage should drop to about 0.4 to 0.5volts and the switch status should show start/crank. If the ignition switch status shows FF, that is an undermined switch status. The ignition switch voltage is supplied by a voltage regulator (5volts) with-in the WCM (WIRELESS CONTROL MODULE). This regulator not only feeds the ignition switch with voltage, but if the vehicle has remote start, it all so powers the WCM antenna. So, items that affect the ignition switch voltage readings would include the power or ground circuits to the WCM, ignition switch and the WCM antenna. The WCM antenna can short and take down the ignition switch voltage. A shorted antenna can cause issues with the WCM functioning properly, i.e. starting and or key programming. Check antenna wire for damage or try and unplug the WCM antenna and recheck the ignition switch voltage.
Take this copy to your dealership and check for radio interference. Good luck with your wrangler got an 08 4 door rubicon I have not had this problem with mine yet. Hope this helps you please rate it.
Posted on Jul 09, 2009
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Posted on Jan 02, 2017
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