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Rough Shifts and Hesitation on 2018 Enclave - Time for Transmission Fluid Service?

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Sarah K. · rep 0 · May 25, 2:47 AM · 1 replies · solved · Question

Vehicle: 2018 Buick Enclave Premium

Hey everyone,

I've got a 2018 Buick Enclave Premium, and lately, I've noticed some unusual behavior with the transmission. It feels like there's a slight hesitation when accelerating from a stop, and sometimes the shifts feel a bit rougher than they used to, especially between 2nd and 3rd gear.

The car has about 75,000 miles on it, and I'm not sure if the transmission fluid has ever been changed. I've read conflicting information online about when to service the transmission fluid for these models.

Is this a common issue for the Enclave, and could it be related to old transmission fluid? What's the recommended service interval, and is this something a DIYer can tackle, or should I definitely take it to a professional?

Any advice or experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:47 AM

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ClearTheCode admin answer:

It sounds like your 2018 Buick Enclave Premium could indeed benefit from a transmission fluid service, especially with 75,000 miles on the odometer and the symptoms you're describing. Rough shifts and hesitation are classic indicators that the transmission fluid might be degraded or low.

Here's what you should consider:

  1. Check Fluid Level and Condition: Before anything else, check the transmission fluid level using the dipstick (if equipped, some newer models require a shop procedure). Note the color and smell. Healthy fluid is typically reddish and doesn't smell burnt. Dark, burnt-smelling fluid is a strong sign it needs changing.
  2. Manufacturer's Recommendation: For many Buicks, the transmission fluid is considered a 'lifetime' fill under normal driving conditions. However, under 'severe' driving conditions (e.g., heavy towing, frequent stop-and-go traffic, mountainous terrain, extreme temperatures), GM often recommends service every 50,000 to 100,000 miles. Your symptoms suggest you might fall into the severe category, or simply that the fluid has reached its practical limit.
  3. Service Type: A simple drain and fill replaces only a portion of the fluid. A full fluid exchange (flush) replaces nearly all of it. A flush is generally more effective but should be done carefully by a shop to avoid dislodging debris in older transmissions.

Causes of Symptoms:

  • Degraded Fluid: Over time, transmission fluid loses its lubricating properties and can accumulate clutch material, leading to increased friction and heat, causing rough shifts.
  • Low Fluid Level: Can lead to inadequate hydraulic pressure, causing hesitation and slipping.

When to See a Shop:

  • If you're unsure about the process: Transmission fluid service requires specific fluid types (e.g., DEXRON-VI for your Enclave) and precise filling procedures. Using the wrong fluid or incorrect level can cause significant damage.
  • If symptoms persist after a fluid change: This could indicate a deeper mechanical or electronic issue within the transmission, requiring professional diagnosis.
  • No dipstick: Many modern transmissions are sealed units that require specialized tools and knowledge to check or change fluid.

Given the complexity, for a full fluid exchange, it's highly recommended to have a qualified technician perform the service. They can also inspect for any leaks or other potential issues.

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