This bulletin applies to 2012-2013 Jeep Grand Cherokee and Durango models. Some 2012-2013 Jeep Grand Cherokee vehicles may experience a surge, shudder or pulsation type sensation when driving on a smooth road at highway speeds of 40-80 mph. The fix involves reprogramming the PCM with software release 14.03 or higher.
Note: This is an optional software update that should only be used in situations where the customer is specifically complaining about the above condition. There will be two separate software options displayed on the wiTECH flash tab. The software file released for this service bulletin contains the term “REFERENCE SB 18-035-14. THIS FLASH TO BE USED ONLY FOR SHUDDER COMPLAINTS.”
Using a scan tool (wiTECH), first verify that all engine systems are functioning properly. If DTCs are present, record and repair as needed before proceeding.
Install a battery charger so that the battery voltage does not drop below 13.2 volts or climb above 13.5 volts during the flash process.
Reprogram the PCM with the latest software. After reprogramming, clear any DTCs that may have set in other modules.
About the Author
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
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