2018 Jeep Cherokee Transmission Fluid & Service

Quick Answers

• Transmission Make/Model: ZF 9HP48 9-Speed Automatic
• OEM Fluid Spec: Mopar ZF 8&9 Speed ATF (Part No. 68218925AA)
• Drain & Fill Capacity: Approximately 3.5 quarts
• Full Overhaul Capacity: Approximately 6 quarts
• Filter OEM Part Number: 68225344AA
• Recommended Service Interval: 30,000 miles (severe duty) to 60,000 miles (normal duty)

Fluid Type Explained

The 2018 Jeep Cherokee is equipped with a sophisticated ZF 9HP48 9-speed automatic transmission. This is a state-of-the-art gearbox that requires a very specific fluid to operate correctly. The OEM-specified fluid is Mopar ZF 8&9 Speed ATF, which is a fully synthetic fluid designed to handle the high pressures and tight tolerances of this transmission. Use of any other fluid will result in poor shifting, accelerated wear, and potential transmission failure. Aftermarket fluids claiming to be "universal" or "multi-vehicle" should be avoided.

Service Procedure

There are two main ways to service the transmission fluid in your 2018 Jeep Cherokee: a drain and fill, or a full fluid exchange. A drain and fill is the more common and less expensive option. It involves draining the fluid from the transmission pan, replacing the filter, and refilling with fresh fluid. This method typically replaces about 3.5 quarts of the total 6-quart capacity. A full fluid exchange, on the other hand, uses a machine to pump all of the old fluid out of the transmission and replace it with new fluid. This method is more expensive, but it ensures that all of the old, contaminated fluid is removed. For most owners, a drain and fill is sufficient. However, if you tow heavy loads or drive in severe conditions, a full fluid exchange may be a better option.

Service Interval

The recommended service interval for your 2018 Jeep Cherokee's transmission depends on your driving habits. For normal driving, the interval is 60,000 miles. For severe duty driving, which includes towing, heavy stop-and-go traffic, or driving in extreme temperatures, the interval is 30,000 miles. It is important to note that these are just recommendations. If you notice any problems with your transmission, such as slipping, hard shifting, or strange noises, you should have it serviced as soon as possible.

Common Transmission Problems

The ZF 9HP48 transmission in the 2018 Jeep Cherokee has been known to have some issues. The most common complaints include:

• Harsh shifting: This is often caused by a software issue, and a simple reflash of the transmission control module (TCM) can often fix the problem.
• Hesitation or "hunting" for gears: This can also be a software issue, but it can also be caused by a more serious problem, such as a faulty valve body or torque converter.
• Leaking fluid: This is a common problem on many vehicles, and it can be caused by a variety of factors, such as a bad seal or a cracked transmission pan.

If you are experiencing any of these problems, it is important to have your vehicle diagnosed by a qualified technician as soon as possible. Ignoring transmission problems can lead to more serious and expensive repairs down the road.

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