Theory Of Operation
WARNING: This page is about a different car, the 2017 Jeep Patriot and 2017 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.
The purpose of this diagnostic is to check the integrity of the calibration data in the TCM. This is accomplished by calculating the checksum of all the calibration data after the TCM is powered up. The malfunction condition is detected if the calculated checksum of the calibration data is not equal to the stored checksum located in the Non-Volatile Random Access Memory (NVRAM).