Hard Shifts and Transmission Slips on Mazda CX-9

Submitted by casey40510 · Apr 1, 2025
Published by RepairPal

Problem overview

The Mazda CX-9 is known to have issues with hard shifts and transmission slippage on models equipped with the six speed automatic transmission. When the transmission gets warm, the issues is most noticeable as a hesitation to shift, followed by jerking or jolting into the next gear. These issues are not typically observed in combination with the check engine light.

The hard shifting and transmission slipping is commonly a result of software inadequacies, which do not account for all variables as the transmission heats to normal operating conditions. In some cases, the automatic transmission may be suffering from a damaged valve body or faulty shift solenoids.

Software updates from the manufacturer of this transmission have solved many reported complaints, but not all. In cases where software updates to the transmission controller have failed, the transmission will likely need valve body replacement, shift solenoid testing and replacement, or even a complete rebuild. Since the transmission is sealed for life, the fluid is not normally considered a suspected cause, but many technicians recommend changing the transmission specific automatic transmission fluid at normal intervals.

177 people reported this problem
44 comments
Schedule Repair

Search for another problem

RepairPal Car Genius

Ask our experts about your Mazda.

RepairPal Car Genius™ is a free resource for vehicle owners seeking advice on maintenance, auto repair, shop inquiries, estimates, and finding a trustworthy repair shop in your area.

 Auto Repair Expert Auto Repair Expert

Call us at 877-913-1554

Available 9am – 6pm ET Monday through Friday

Call Our Experts