This bulletin applies to 2012-2013 Jeep Grand Cherokee and Durango models. A “small number” of customers may experience a surge, shudder or pulsation type sensation when driving on a smooth road at highway speeds of 40 to 80 mph. Some customers may describe the sensation as similar to a fish biting on a lure.
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 verbiage “REFERENCE SB 18-035-14. THIS FLASH TO BE USED ONLY FOR SHUDDER COMPLAINTS.”
The other file is the standard software that does not contain improvements for this specific complaint. If for some reason the customer finds this shudder improvement objectionable, the PCM may be returned/reflashed to the standard version.
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.
