This bulletin applies to 2012-2013 Jeep Grand Cherokee vehicles equipped with a 5.7L engine. The engine may be difficult to start in extreme cold ambient temperatures when using the block heater. This bulletin addresses improving the spark and fuel strategy under these conditions.

Reprogram with wiTECH software release 14.03 or higher. An improved electronic voltage regulator is now offered as well to more precisely maintain system voltage.

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