Harsh shifting in your 2017 Acura MDX at 100,000 miles may involve the ZF 9-speed automatic transmission that has experienced programming challenges across multiple manufacturers. Understanding whether it's a wear issue or calibration problem guides the solution.
The ZF 9-Speed Background
The ZF 9HP transmission is used by multiple manufacturers including Acura/Honda, Jeep, and Land Rover. It's faced criticism for harsh shifts, hesitation, and rough engagement. Multiple software updates have been issued to address shifting behavior.
Software vs Mechanical Issues
Early complaints were often addressed by transmission software updates that refined shift programming. If your MDX has never had software updates, this should be checked first. However, at 100,000 miles, mechanical wear can also cause harsh shifting unrelated to software.
Code P0700 Significance
P0700 is a generic flag indicating transmission-specific codes are stored. Deeper scanning reveals specific codes identifying solenoid issues, ratio problems, or other faults. This code alone doesn't diagnose the problem.
Diagnosis Path
First, check if all software updates have been applied - Acura has issued several. If updates are current, further diagnosis determines if mechanical wear is present. Fluid condition, specific fault codes, and road test behavior guide the technician toward root cause.