2020 Enclave A/T Shifting Rough - Is this normal?

ClearTheCode admin answer:

Rough shifting in a 2020 Buick Enclave can be a concern, but it's not always indicative of a major failure immediately. Here's what you should consider:

1. Check for Technical Service Bulletins (TSBs): Buick has released TSBs for transmission performance issues on various models. Your dealership can check if there's a relevant software update or specific procedure for your vehicle's VIN that addresses shifting concerns.
2. Transmission Fluid Condition:
   • Level: Ensure the transmission fluid is at the correct level. Low fluid can cause erratic shifting.
   • Quality: Old or contaminated fluid can lose its lubricating properties, leading to harsh shifts. While many modern transmissions are 'sealed for life,' a fluid exchange might be recommended by a specialist if the fluid looks dark or smells burnt.
3. Adaptive Learning: Modern transmissions have adaptive learning capabilities. Sometimes, a reset of the transmission's adaptive values can help it 're-learn' optimal shift points, especially after battery disconnections or certain repairs.
4. Common Causes for Rough Shifting:
   • Software Glitches: Often resolved with a reflash.
   • Valve Body Issues: Internal transmission component that directs fluid flow.
   • Solenoid Problems: Solenoids control fluid pressure and flow to engage gears.
   • Torque Converter Issues: Can cause shuddering or delayed engagement.

When to See a Shop: If the rough shifting persists, worsens, or is accompanied by warning lights (e.g., 'Service Transmission'), unusual noises, or a burning smell, it's crucial to have a qualified mechanic or Buick dealership inspect the vehicle immediately. Early diagnosis can prevent more extensive and costly repairs.