The 2016 Infiniti Q50's 7-speed automatic transmission should deliver smooth, responsive shifts, but harsh shifting accompanied by P0700 indicates the transmission control system has detected a fault. Understanding this transmission helps identify appropriate solutions.
Q50 7-Speed Automatic Design
The 2016 Q50 uses Nissan's JATCO 7-speed automatic with adaptive shift programming. The transmission learns driving style and adjusts shift timing accordingly. The system includes a torque converter with lockup clutch for efficiency.
Understanding P0700
P0700 is a generic code indicating the TCM has stored specific fault codes. This code alone doesn't diagnose the problem—Nissan/Infiniti-specific codes must be retrieved to identify the actual issue. Harsh shifting may result from several causes that P0700 doesn't specifically identify.
Common Causes of Harsh Shifting
Transmission fluid degradation affects shift quality and clutch engagement. Adaptive values may become corrupted from battery issues or module faults. Solenoid wear affects specific gear transitions. Torque converter lockup issues can feel like harsh shifting. Software calibration may need updating.
Diagnostic and Service Approach
Retrieve Nissan/Infiniti-specific transmission codes. Check fluid level and condition using proper procedure. Review software version for available updates. Perform adaptation reset after service or battery work. If issues persist, further diagnosis of solenoids or internal components is needed.