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2018 Enclave Transmission Shudder - Time for a Fluid Change?

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Christine P. · rep 0 · May 22, 3:52 AM · 1 replies · solved · Question

Vehicle: 2018 Buick Enclave Premium

Hey everyone,

I've got a 2018 Buick Enclave Premium with about 75,000 miles on it, and lately, I've noticed a slight shudder or hesitation, especially when accelerating gently around 30-45 mph. It's not constant, but it's definitely noticeable and a bit concerning.

I've read online that some GM transmissions can develop this issue, and a transmission fluid flush or change, sometimes with a specific additive, can help. Is this something I should consider doing myself, or is it best left to a professional? I'm pretty handy with basic maintenance but haven't tackled a transmission fluid change before.

Also, are there any specific fluid types or procedures I should be aware of for this model year? No check engine light yet, but I want to address this before it potentially gets worse.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:52 AM

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This is a common concern for many GM vehicles, including your 2018 Buick Enclave, especially with the 9-speed automatic transmission. The shudder you're describing often points to issues with the torque converter clutch (TCC) or the transmission fluid itself.

Causes:

  • Degraded Transmission Fluid: Over time, transmission fluid breaks down, losing its lubricating and friction-modifying properties. This can lead to TCC shudder.
  • Torque Converter Clutch Wear: The TCC can wear out, causing inconsistent lock-up and the shuddering sensation.
  • Software Issues: Less commonly, a transmission control module (TCM) software update might be needed.

DIY vs. Professional:

  1. Fluid Check: Start by checking your transmission fluid level and condition. Refer to your owner's manual for the correct procedure, as many modern transmissions require specific steps (e.g., checking at operating temperature in neutral).
  2. Fluid Change: For your 2018 Enclave, a transmission fluid drain and fill is generally recommended over a full flush, especially if the fluid is very dirty. GM has a specific fluid, DEXRON-VI, and sometimes a triple-flush procedure with a specific additive (like AC Delco's Friction Modifier) is recommended by dealerships to address TCC shudder. This is a more involved process.
  3. Filter Replacement: While changing the fluid, consider replacing the transmission filter if accessible, though many modern transmissions have internal filters that are not part of routine maintenance.

When to See a Shop:

  • If the shudder persists after a fluid change.
  • If you notice any diagnostic trouble codes (DTCs) like P0741 (Torque Converter Clutch Circuit Performance or Stuck Off).
  • If you're uncomfortable performing the fluid change yourself, as it requires specific tools and knowledge to ensure proper fluid levels and avoid contamination.
  • If the issue is accompanied by hard shifts, slipping, or a check engine light, a professional diagnosis is crucial to prevent further damage.
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