The 2020 Honda Ridgeline uses a ZF-sourced 9-speed automatic transmission that some owners find shifts more abruptly than expected. While this transmission offers excellent fuel economy through numerous gear ratios, shift quality complaints have led Honda to address the issue through software updates and fluid specifications.
Understanding 9-Speed Shift Character
Nine-speed transmissions pack more gear ratios into a similar-sized package as older 6-speeds. This requires tighter internal tolerances and more sophisticated programming. The transmission must decide rapidly which of nine gears is optimal, sometimes resulting in busy shifting during variable-throttle driving.
Some shift firmness is intentional. Honda calibrated the transmission to avoid the "slipping" sensation some drivers complained about in earlier CVT-equipped vehicles. Firm engagement provides a more connected feel but can seem harsh to those accustomed to older transmissions.
P0700 and Transmission Codes
If P0700 accompanies harsh shifting, the transmission control module has stored additional codes. P0700 simply flags that transmission codes exist—a professional scan tool is needed to read the specific codes. These specific codes point to solenoid issues, pressure faults, or other detectable problems.
Honda's Software Solutions
Honda released software updates improving shift quality in the 9-speed across several model years. These updates refine shift timing, pressure application, and torque converter lockup feel. Ask your dealer whether updates are available for your specific vehicle. Reprogramming takes about an hour and is sometimes performed free under service campaigns.
Transmission Fluid Importance
The 9-speed requires Honda ATF-DW1 fluid with specific friction characteristics. Using incorrect fluid, even if marketed as compatible, can cause harsh shifts. If fluid has been serviced with non-Honda fluid, draining and refilling with genuine ATF-DW1 may improve shift quality.
Fresh fluid in general can improve shift feel. While Honda considers the fluid "lifetime," many technicians recommend changes every 60,000 miles. Degraded fluid loses its friction modifier properties and affects clutch engagement smoothness.
When to Seek Diagnosis
If software updates and proper fluid don't resolve harsh shifting, internal issues may exist. Valve body solenoids, clutch pack wear, or mechanical problems require professional diagnosis. Honda has addressed some issues under warranty extensions, so check with your dealer about coverage.