Spark Knock, Noise/Vibration/Harshness, and/or Check Engine Light Issues on Jeep Grand Cherokee

Spark knock, noise/vibration/harshness, and/or Check Engine Light issues may develop. Our technicians tell us powertrain control module (PCM) software upgrades may correct these concerns.

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Average mileage: (–)
Engine affected: 5.7L V8 HEMI
1 model year affected: 2009
1 person reported this problem
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