SOURCE: 2006 jeep wrangler check engine light came on it
There is a software update for the PCM that addresses this issue. TSB 18-028-06
SOURCE: engine keeps missing. unknown codes
Code 1682 indicates low battery voltage. This could be a problematic alternator, which would likely cause misfiring. Autozone should be able to check this for you for free.
Code 1391 indicates the computer can not see the crank or cam sensor signal. This would likely be a result of the misfires.
Code 0320 indicates the crankshaft position sensor reference signal could not be found while the engine is cranking.
All of these issues point to either a cam/crank sensor malfunction or a charging system problem, either or both of which could cause the misfiring.
SOURCE: 1995 Jeep Wrangler 2.5L Fuel Pump/Check engine light
Could be one of several items...I'd check the fuel pump relay, auto shutdown relay and the ignition switch itself. I'd bet on it being one of those relays but, we all have been fooled at least once!!! I'd also make sure that body and engine grounding is good and clean. Relays can't work properly without a good ground.
SOURCE: 2004 wrangler chek engine light on. Code
a fuel cap indication would mean a leak not nessesaraly your gas cap, id check the fuel neck vent hose for a leak
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