Transmission jerking in your 2016 Jeep Grand Cherokee's 8-speed automatic, combined with a P0700 code, indicates the transmission control module has logged faults affecting shift quality. The ZF 8HP transmission used in this generation is generally reliable but can develop issues causing harsh or erratic shifting.
Understanding the ZF 8HP
The ZF 8HP is a sophisticated 8-speed automatic used across many luxury and performance vehicles. It offers smooth shifts and excellent efficiency when functioning properly. The complexity of managing eight forward gears means multiple potential failure points can cause shift quality problems.
P0700 as Alert Code
P0700 indicates additional transmission codes are stored requiring retrieval with a capable scanner. This generic alert prompts deeper diagnosis to find specific fault codes identifying solenoid problems, pressure issues, or mechanical faults.
Common Jerking Causes
Transmission fluid condition critically affects shift quality in the ZF 8HP. The mechatronic unit (valve body) contains solenoids and sensors controlling shifts—contamination or electrical issues here cause problems. Software calibration issues have prompted numerous updates from Chrysler. Torque converter lockup irregularities also create jerking sensations.
Software Updates Critical
FCA has released multiple transmission software updates for the Grand Cherokee addressing shift quality complaints. Many jerking issues resolve with updated TCM calibration that modifies shift timing, pressure, and torque converter behavior.