2018 Enclave Shuddering - Time for Transmission Fluid Service?

Hi Sarah,

That shuddering sensation in your 2018 Buick Enclave Premium at 75,000 miles is a common symptom that often points to the transmission fluid. Here's what you should know:

Causes of Shuddering:

1. Degraded Transmission Fluid: Over time, transmission fluid loses its lubricating and friction-modifying properties. This can lead to the torque converter clutch (TCC) not engaging smoothly, causing the shudder.
2. Worn Torque Converter: Less common, but a worn TCC itself can also cause shuddering.

Recommended Action Steps:

1. Check Fluid Level & Condition: First, check your transmission fluid level and observe its color and smell. Healthy fluid is typically reddish and clear, without a burnt odor. Dark, murky fluid with a burnt smell is a strong indicator it needs changing.
2. Transmission Fluid Service: For your 2018 Enclave, Buick generally recommends a transmission fluid and filter change between 60,000 to 100,000 miles, depending on driving conditions (e.g., heavy towing, frequent stop-and-go traffic might warrant earlier service). It's crucial to use the correct fluid, which for your vehicle is typically DEXRON-VI automatic transmission fluid.
3. Consider a Flush vs. Drain & Fill: A simple drain and fill replaces only a portion of the fluid. A full flush (performed by a professional machine) replaces nearly all of it. Discuss options with a trusted mechanic.

When to See a Shop:

• If the shuddering is severe or accompanied by other symptoms like delayed shifts, slipping, or warning lights.
• If you're unsure about performing the fluid check or service yourself.
• If a fluid change doesn't resolve the issue, as it could indicate a deeper mechanical problem with the transmission or torque converter. An OBD-II scan might reveal codes like P0741 (Torque Converter Clutch Circuit Performance) which would confirm a TCC issue.