Some 2011 Jeep Grand Cherokee SUVs with 3.6L engines built prior to Aug. 17, 2010, may produce a sag or hesitation when launched from a stop.
According to Chrysler, the drivability issue often will be accompanied by an illuminated check engine light, with trouble code P06DD logged in computer memory. Software gremlins in the PCM are the most likely cause of the trouble. Reprogramming the module with updated calibration files is the only reliable fix. Check with a dealer for the specifics of the flash.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].