How to change Transmission Fluid Chevrolet Malibu 2008-2018 Fill and Drain Plugs Location

In this video, I show you the exact location of the fluid fill and drain plugs, along with the complete step-by-step process to change the transmission fluid on a 2008-2018 Chevrolet Malibu.

Whether your Malibu is equipped with the 4-speed automatic (4T45E), the common 6-speed automatic (6T40/6T70 series), or the newer 9-speed transmission, these vehicles do not feature a traditional underhood transmission dipstick. Instead, GM uses a specific fill cap, a bottom drain plug, and a side fluid-level check plug (also called a weep hole plug) to verify the correct level. Knowing how to locate these plugs and properly level the fluid will save you time and prevent costly transmission damage.

Plug Locations & Configuration

Because this generation span covers transitions in transmission models, the locations remain highly similar across the automatic setups:

• The Fluid Fill Cap: Located on top of the transmission case under the hood. You will need to look down past the driver’s side air intake ductwork. It is typically a black screw-off plastic cap (sometimes labeled “Dexron VI”).
• The Fluid Drain Plug: Located on the very bottom of the transmission oil pan/case facing the ground. It requires an 11mm wrench or a specific Allen/Torx bit depending on the exact model year.
• The Fluid Level Check Plug (Weep Hole): Located on the driver’s side of the transmission housing, near the inner CV axle output shaft or side cover. Removing this plug with the engine running and warm allows you to see if the fluid level is perfectly flush with the internal standpipe.

Common Symptoms of Old or Low Transmission Fluid:

• Delayed, harsh, or erratic shifting between gears, or a sudden “clunk” when shifting into Reverse or Drive
• Transmission slipping, where the engine RPMs rev up but the vehicle struggles to accelerate or hold speed
• A noticeable hesitation or shuddering when climbing hills or accelerating onto the highway
• High transmission operating temperatures or a distinct burnt oil smell inside the cabin
• Increased transmission whine or mechanical noise coming from the driver’s side engine bay area

Safety First

Always prioritize safety before tackling a transmission fluid service. You must securely support the vehicle on heavy-duty jack stands and ensure it is perfectly level. If the car is tilted on an angle while you are checking the fluid level at the side check plug, you will end up underfilling or overfilling the transmission, both of which cause severe internal damage.

Ensure the emergency parking brake is firmly engaged and the rear wheels are securely chocked. Because you will be working close to hot exhaust components and handling hot fluids to get an accurate level reading, protect your eyes and skin by wearing safety glasses and heavy-duty, fluid-resistant work gloves.

Need Help? Ask an Expert

I am an experienced mechanic, and I am here to help you guide your vehicle projects to a successful finish. If you hit a snag trying to break loose a stubborn, rusted drain plug, aren’t sure exactly how to perform the specific fluid-level check procedure while the engine is running, or want to verify the exact fluid capacity and type for your specific model year, leave a message in the comments below. Let me know what you are running into, and I will help you solve your car’s problem!