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2023 Enclave Transmission Shifting Hard/Delayed Engagement

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Christine P. · rep 0 · May 22, 3:49 AM · 1 replies · solved · Question

Vehicle: 2023 Buick Enclave Avenir

My 2023 Buick Enclave Avenir, with only 15,000 miles, has developed a concerning transmission issue. Sometimes, especially when cold, it shifts very hard between gears, and there's a noticeable delay when engaging drive or reverse. There's no Check Engine Light on yet, but it definitely doesn't feel right.

Is this a known problem with the 9-speed transmission in newer Enclaves? What should I be looking for, or is this something that needs immediate dealer attention? I'm worried about potential long-term damage.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:49 AM

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ClearTheCode admin answer: It's concerning to hear about hard shifting and delayed engagement in your 2023 Buick Enclave Avenir, especially with such low mileage. While the 9-speed automatic transmission is generally reliable, these symptoms warrant immediate attention.

Here are potential causes and what to consider:

  1. Transmission Fluid Issues: Low or contaminated transmission fluid can cause shifting problems. Even with low mileage, a factory fill error or a small leak could be present. The fluid level and condition should be checked first.
  2. Software/Firmware Updates: Modern transmissions are heavily controlled by software. Sometimes, harsh shifting can be resolved with a transmission control module (TCM) software update from the dealer. This is a common first step for many driveability complaints.
  3. Solenoid Problems: Solenoids within the transmission control fluid flow to engage gears. A faulty or sticking solenoid can lead to delayed engagement or harsh shifts.
  4. Internal Mechanical Wear: While less likely at 15,000 miles, internal wear or a manufacturing defect in clutches or other components could be a possibility.
  5. Sensor Input: Issues with sensors that feed data to the TCM (e.g., vehicle speed sensor, throttle position sensor) can sometimes indirectly affect shift quality.

When to see a shop:

  • Given your vehicle's low mileage and the fact that it's a 2023 model, it is almost certainly still under factory warranty. You should take it to a Buick dealership immediately.
  • Do not attempt to diagnose or repair this yourself, as it could void your warranty or cause further damage.
  • The dealership has specialized diagnostic tools and access to technical service bulletins (TSBs) specific to your vehicle's transmission that might address this exact issue. They can accurately check fluid levels, perform software updates, and diagnose internal components if necessary. Document the issue thoroughly before your visit.
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