Question about 2007 Jeep Liberty Sport

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Trans computer chip reporting problem but I have a bad battery

Can a bad battery cause problems with the transmission computer chip? ie: Could it report the chip is bad but just needs a battery? I am in the computer business and I know here the lack of power causes my computers to malfunction and makes it hard to diagnose.Thanks for your help

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  • chryslerguy May 11, 2010

    The transmission controller is incorporated in the engine controller (same module). Power is supplied by the vehicle battery. There is no internal battery for the module, so when it is unplugged it resets to default settings losing any adaptive memory configurations. The system needs 12 volts to operate correctly. So if the vehicle battery has a bad cell, is weak, or can't maintain sufficent voltage during normal operations the vehicle can have some strange drivability effects. Less than 10 volts can make any module on the vehicle act "dumb". I hope this helps with your diagnosis.

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  • Jeep Master
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Automotive computers need proper voltage at the battery in order to be properly tested or function properly. If your battery has 12v it is good enough to go ahead and test components. The system will "forgive" a slight deficit in power, but should not be tested without proper battery charge.

Posted on May 28, 2009

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Fixya expert sources


The odds your sensor is bad is about 30%

The odds you have internal trans wear & damage
is about 70%

Sensors only report mechanical things that are not right
when the vehicles computer scans them,that said, sensors
do fail, BUT you use the codes to diagnose the system
& component test

Codes DO NOT indicate a failed part or need to replace any

All parts have to be tested & fail, or why would you waste money
throwing parts at a problem

We did that in that 1960's & got away with it,not with today's
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