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Old 12-19-2012, 04:28 PM
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Parked Jeep is Eating my Battery!

My son's 2000 JGC sits idle in the driveway these days, as he is currently living & working in Boston with no space for a car.

I've been starting it up every so often and taking for a short drive. ~5-10 miles, local & hwy miles - gets to full temp. Last couple attempts, the Jeep has complained when turning over. Today needed a JUMP from my WK2 to start from a very ~nearly dead battery.

A solid check engine light was illuminated today. Battery was fully charged after today's joy ride.

I replaced the completely dead battery this summer (would not take a charge). So, battery is fresh.

Why is the Jeep eating my battery? Is 1 idle week enough to fully drain a new battery? Any suggestions to diagnose the check engine light issue?

Thanks!
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Old 12-19-2012, 04:38 PM
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Re: Parked Jeep is Eating my Battery!

To diagnose the check engine light, switch the ignition switch off/on 3 times and leave it in on at the third time. In the odometer will appear DONE when all ok, or any fault code(s). Let us know what you find.
It is not normal for a battery to deplete in 1 week, normally they say to recharge it when a car is not used for 20 days or so. Is not an accessory left on or a light which doesn't go out?
You could remove the ignition off draw fuse to remove most of the normal battery drain. Even a not connected battery will loose its charge over time, but within one week fore sure is not normal.
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Old 12-19-2012, 04:43 PM
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Re: Parked Jeep is Eating my Battery!

Code - P1899 - park/neutral performance condition.

Ring a bell?
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Old 12-19-2012, 04:48 PM
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Re: Parked Jeep is Eating my Battery!

I have read that a broken ground in the driver's door harness between the door and body will not allow the PCM to go into full sleep mode. I will looks for it later.
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Old 12-19-2012, 04:53 PM
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Re: Parked Jeep is Eating my Battery!

Quote:
Originally Posted by Trav1s View Post
I have read that a broken ground in the driver's door harness between the door and body will not allow the PCM to go into full sleep mode. I will looks for it later.
Thanks, much appreciated.
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Old 12-19-2012, 06:21 PM
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Re: Parked Jeep is Eating my Battery!

P1899 means that the park/neutral switch is stuck in one position. Since you didn't mention that the jeep didn't start at all, i presume that it is stuck in neutral. For the 5-45RFE transmission (with 4.7 V8), this switch is inside the transmission and is part of the TRS solenoid assy.
For the 42RE (with the 4.0 I6) i have to look where this switch is. Wonder though how this switch would cause any battery drain when stuck.
Just confirmed with the manual, and the switch for the 42RE is on the outside of the casing
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