Finding the transmission dipstick on a 2018 Grand Cherokee can be frustrating because it is a sealed unit with a plug located near the back of the engine bay. The exact 2018 Jeep Grand Cherokee transmission dipstick location is not obvious, and many owners assume there is a traditional dipstick tube. In reality, Jeep designed this model with a sealed-for-life transmission that uses a check plug instead of a removable dipstick.
This guide will show you exactly where to find the transmission fluid check plug, how to check the fluid level, and what tools you need. We will also cover common mistakes and alternatives if you prefer to add a aftermarket dipstick. Let us get started.
2018 Jeep Grand Cherokee Transmission Dipstick Location
The 2018 Jeep Grand Cherokee transmission dipstick location is actually a sealed plug on the side of the transmission housing. There is no traditional dipstick tube sticking up from the engine bay. Instead, you will find a plastic or metal plug near the back of the transmission, just behind the oil filter housing.
This plug is often covered by a small rubber cap or a plastic shield. It sits on the driver side of the transmission, close to where the transmission meets the engine block. If you look from above, you might miss it because it is low and tucked under the intake manifold.
Why Is There No Dipstick?
Jeep moved to a sealed transmission design to reduce maintenance and prevent fluid contamination. The idea is that the transmission fluid lasts the lifetime of the vehicle under normal driving conditions. However, if you tow heavy loads or drive off-road frequently, you may need to check the fluid level manually.
This sealed system uses a check plug that requires you to remove it while the transmission is at operating temperature. The fluid should trickle out slowly when the level is correct. If no fluid comes out, you need to add more through the fill plug.
Tools You Will Need
- Jack and jack stands or ramps
- Socket set with extensions
- Torx bit set (T40 or T45 depending on your model)
- Transmission fluid pump or squeeze bottle with hose
- Clean rags
- Infrared thermometer or scan tool to check transmission temperature
- Approved ATF+4 transmission fluid
Step-By-Step Guide To Locate The Check Plug
Follow these steps to find the transmission check plug on your 2018 Grand Cherokee. The process is similar for both the 8-speed and 6-speed transmissions, but the plug location may vary slightly.
- Park the vehicle on a level surface and engage the parking brake.
- Raise the vehicle using a jack and secure it on jack stands. You need enough clearance to crawl under the driver side.
- Locate the transmission oil pan. It is a metal pan bolted to the bottom of the transmission.
- Look on the driver side of the transmission, near the rear. You will see a small plug, usually with a hex head or Torx socket.
- This plug is the check plug. It is often painted or has a small rubber cap over it.
- Clean the area around the plug with a rag to prevent dirt from entering the transmission.
If you cannot find the plug, refer to your owner’s manual. Some models have the plug on the passenger side, but most are on the driver side near the back.
Checking The Fluid Level
Once you have located the check plug, you need to check the fluid level correctly. This is critical because overfilling or underfilling can damage the transmission.
- Start the engine and let it idle. The transmission must be at operating temperature, typically between 100°F and 120°F (38°C to 49°C).
- Shift through all gears (P, R, N, D) pausing for a few seconds in each. Return to Park.
- With the engine running, remove the check plug using the appropriate socket or Torx bit.
- If fluid trickles out slowly, the level is correct. If nothing comes out, you need to add fluid.
- If a steady stream of fluid pours out, the transmission is overfilled. Let it drain until it slows to a trickle, then reinstall the plug.
Important: The fluid must be at the correct temperature. Checking it cold will give a false reading. Use a scan tool or infrared thermometer to measure the transmission pan temperature.
Adding Transmission Fluid
If the fluid level is low, you need to add fluid through the fill plug. The fill plug is usually located on the side of the transmission, above the check plug. On some models, the check plug and fill plug are the same.
- Locate the fill plug. It is typically a larger plug on the side of the transmission housing.
- Remove the fill plug using a socket or Torx bit.
- Use a fluid pump or squeeze bottle with a hose to add ATF+4 fluid through the fill hole.
- Add fluid slowly. Start with half a quart, then check the level again using the check plug.
- Repeat until fluid trickles out of the check hole.
- Reinstall both plugs and torque them to specification (usually around 20-30 ft-lbs).
Do not use any fluid other than ATF+4. Using the wrong fluid can cause shifting problems or transmission failure.
Common Mistakes To Avoid
- Checking the fluid when the transmission is cold. Always warm it up first.
- Overfilling the transmission. This can cause foaming and overheating.
- Using a generic dipstick from an aftermarket kit without proper calibration.
- Forgetting to reinstall the check plug. Driving without it will leak fluid.
- Using the wrong type of fluid. ATF+4 is required for all 2018 Grand Cherokees.
Aftermarket Dipstick Options
If you prefer a traditional dipstick for easier checking, several aftermarket companies sell dipstick kits for the 2018 Grand Cherokee. These kits replace the check plug with a tube and dipstick assembly.
Popular brands include B&M, PPE, and Derale. Installation typically involves removing the check plug, installing a threaded adapter, and mounting the dipstick tube. Some kits require drilling a hole in the transmission pan, so read the instructions carefully.
Keep in mind that adding an aftermarket dipstick voids the sealed system warranty. If your vehicle is still under warranty, consult your dealer before making modifications.
Pros And Cons Of Aftermarket Dipsticks
- Pros: Easier to check fluid level, no need to crawl under the vehicle, can monitor fluid condition.
- Cons: Potential leak points, cost ($50-$150), installation difficulty, warranty concerns.
If you frequently tow or drive off-road, an aftermarket dipstick can save time and hassle. For daily driving, the sealed system is usually sufficient.
Transmission Fluid Type And Capacity
The 2018 Jeep Grand Cherokee uses ATF+4 automatic transmission fluid. This is a synthetic fluid designed for Chrysler transmissions. Do not use Dexron, Mercon, or any other fluid.
The transmission fluid capacity varies by engine and transmission type. The 8-speed ZF 8HP transmission holds about 9-10 quarts when dry. The 6-speed 845RE holds about 8-9 quarts. Always check your owner’s manual for the exact capacity.
When adding fluid, buy an extra quart because you may need more than expected. It is better to have too much than to run out mid-job.
Where To Buy ATF+4 Fluid
- Jeep dealership parts department
- Auto parts stores like AutoZone, O’Reilly, Advance Auto Parts
- Online retailers like Amazon, RockAuto, Summit Racing
- Walmart automotive section (look for Super Tech brand ATF+4)
Prices range from $6 to $12 per quart. Avoid cheap generic fluids that claim to be compatible. Stick with name brands like Mopar, Valvoline, or Pennzoil.
When To Check The Transmission Fluid
Jeep recommends checking the transmission fluid every 30,000 miles under severe driving conditions. Severe conditions include towing, off-road driving, frequent stop-and-go traffic, and extreme temperatures.
For normal driving, the fluid is considered lifetime, but many mechanics recommend changing it every 60,000 to 100,000 miles. If you notice slipping, hard shifts, or delayed engagement, check the fluid level first.
Other signs of low fluid include whining noise from the transmission, overheating, or fluid leaks under the vehicle. If you see red or brown fluid on the ground, inspect the transmission seals and pan gasket.
Transmission Temperature Monitoring
The 2018 Grand Cherokee has a transmission temperature gauge in the instrument cluster. If the temperature exceeds 230°F (110°C), pull over and let the transmission cool. High temperatures can degrade the fluid quickly.
If you tow frequently, consider installing an auxiliary transmission cooler. This helps maintain safe temperatures and extends fluid life.
Frequently Asked Questions
Where is the transmission dipstick on a 2018 Jeep Grand Cherokee?
There is no traditional dipstick. The check plug is located on the driver side of the transmission, near the rear. You must crawl under the vehicle to access it.
Can I add a dipstick to my 2018 Grand Cherokee?
Yes, aftermarket dipstick kits are available from brands like B&M and PPE. They replace the check plug with a tube and dipstick assembly.
What type of transmission fluid does a 2018 Jeep Grand Cherokee use?
It requires ATF+4 automatic transmission fluid. Do not use any other type.
How do I check the transmission fluid without a dipstick?
Remove the check plug while the engine is running and the transmission is at operating temperature. Fluid should trickle out slowly if the level is correct.
Why is there no dipstick on my 2018 Grand Cherokee?
Jeep designed the transmission as a sealed unit to reduce maintenance and prevent contamination. The fluid is considered lifetime under normal driving conditions.
Final Tips For Transmission Maintenance
Regularly inspect the transmission for leaks, especially around the pan gasket and cooler lines. If you notice fluid loss, address it promptly to avoid damage.
If you are uncomfortable checking the fluid yourself, take the vehicle to a trusted mechanic. Many shops are familiar with the sealed transmission design and can check the level quickly.
Keep a record of any transmission service, including fluid changes and dipstick installations. This helps with resale value and warranty claims.
Remember that the 2018 Jeep Grand Cherokee transmission dipstick location is not a traditional dipstick. It is a check plug that requires a bit of effort to access, but with the right tools and knowledge, you can maintain your transmission properly.
If you plan to keep your Grand Cherokee for many years, consider investing in an aftermarket dipstick. It makes fluid checks much easier and gives you peace of mind. Otherwise, stick with the factory procedure and check the fluid at recommended intervals.
We hope this guide has helped you understand the 2018 Jeep Grand Cherokee transmission dipstick location. If you have further questions, consult your owner’s manual or visit a Jeep forum for model-specific advice.