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Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 13365
Experience:  Jeep Certified Master Tech
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2009 jeep patriot automatic vin# 1J4FT28B49D101495 battery

Customer Question

2009 jeep patriot automatic vin# ***** battery good, starting system good and charging system good. It has been checked by several auto parts stores.
the problem is it will not go into sleep mode when i cut it off. the problem seems to be the car keeps doing a self diagnotisc every thirty two seconds
until the battery dies. the auto parts store did check for codes and it had several codes. The two that pertained to the engine was P2004 and
P2017. We know the two codes go to intake manifold runner control. The courtesy power does go off after the key is turned off and the door not
opened. If I open the doors the courtesy power cuts off right away. Has there been any issues with the PCM needing to be re-flashed.
The vehicle is stock and no modifactions at all. Has had no work done to it other then oils changes.
Submitted: 4 months ago.
Category: Jeep
Expert:  Chris replied 4 months ago.

Hello and welcome to just answer. There are many control modules/computers in your Patriot. Any one of these modules can stay awake and not power down. Sometimes a module will "wake up" other control modules. That is the cause of the battery drain. The procedure to find out which module it is will be to connect an ammeter in series between the negative battery cable and the negative battery post. Or you can use a 12 volt incandescent test light connected in series. Then you will need to start removing fuses one at a time or start disconnecting the control modules until the ammeter reads below 40 milliamps, or the test light turns off or gets really dim. Is this something you want to do or have a shop or dealer do this?

Chris