Has the 2020 ZF 9AT been resolved?
2 Answers
2020 ZF 9AT has not been resolved. Here is more related information: ZF 9AT issues: The main problem with the ZF 9AT is its unreasonable gear ratio distribution. The first gear ratio is 4.7, while the ninth gear ratio is 0.48, resulting in a span of 9.8 (4.7÷0.48=9.8). In comparison, the span of the GM 9AT is 7.6. Additionally, the gear ratio change between the first and second gears of the ZF transmission is more significant, leading to more noticeable jerks. Compared to Mercedes and GM, whose ninth gear ratios are around 0.6, ZF's ninth gear ratio is as low as 0.48, which is somewhat aggressive. GM 9AT: The gear ratio of GM's 9AT is more reasonable. Its overdrive gears are only the 8th and 9th gears, balancing fuel efficiency with practicality—the 9th gear can engage at a speed of 95 km/h. According to different cycle condition statistics, the usage frequency of the 9th gear is between 13% and 52%, while ZF's is only about 10%.
As someone who frequently deals with car maintenance, I witnessed firsthand in 2020 that the issues with ZF's 9AT transmission were alleviated. Early models, like the 2015 Jeep Wrangler, were prone to shift jerking and fluid leakage. However, ZF introduced firmware updates and hardware optimizations in 2020, such as improved shift modules and seals. Nowadays, newer models rarely have major problems. That said, some used cars might still carry old issues, so it's advisable to have them diagnosed and maintained by a professional shop. After all, the drivetrain directly affects driving feel, and neglecting issues can shorten the vehicle's lifespan. Pay attention to maintenance records and software versions regularly.
