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Rough Shifting and Hesitation in 2019 Enclave Avenir

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Melissa G. · rep 0 · May 22, 3:48 AM · 1 replies · solved · Question

Vehicle: 2019 Buick Enclave Avenir

Hey everyone, I'm experiencing some really frustrating issues with my 2019 Buick Enclave Avenir, 3.6L V6. Lately, the transmission has been acting up, especially when shifting between gears 2 and 3, and sometimes 4 and 5. It feels like it's hesitating or even clunking into gear.

It's not constant, but it's happening more frequently, particularly after the car has been running for a while. I've also noticed a slight loss of power during acceleration, almost like the transmission is slipping. Has anyone else with a similar model year Enclave encountered this? I'm worried it might be a major transmission problem.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:48 AM

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ClearTheCode admin answer:

Rough shifting and hesitation in your 2019 Buick Enclave Avenir can stem from several issues within the engine and drivetrain system. Given your description, it's crucial to address this promptly to prevent further damage.

Common Causes & Diagnostics:

  1. Low or Contaminated Transmission Fluid: This is often the simplest cause. Check your transmission fluid level and condition. If it's low, dark, or smells burnt, it needs attention. Low fluid can cause slipping and hard shifts.
  2. Transmission Solenoid Issues: Solenoids control the flow of transmission fluid, directing shifts. A faulty solenoid can lead to erratic shifting. This might trigger codes like P0700 (Transmission Control System Malfunction) or specific solenoid performance codes (e.g., P0751, P0756).
  3. Torque Converter Problems: The torque converter can cause slipping and hesitation, especially during acceleration. A failing torque converter might also produce a shuddering sensation.
  4. Valve Body Malfunction: The valve body directs hydraulic pressure to engage the correct gears. Wear or blockages in the valve body can lead to delayed or harsh shifts.
  5. Software Glitch: Sometimes, a simple transmission control module (TCM) software update or reflash can resolve shifting irregularities. Buick has issued updates for various models.

When to See a Shop:

  • Immediately: If you notice a strong burning smell, hear grinding noises, or the vehicle refuses to engage a gear.
  • Soon: If the issue is persistent, worsening, or if your check engine light illuminates. A professional technician can perform a diagnostic scan to retrieve any stored trouble codes (DTCs) and accurately pinpoint the problem. They can also check fluid pressure, perform a road test, and inspect internal components if necessary. Ignoring these symptoms can lead to more extensive and costly repairs.
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