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2020 Encore Transmission Shifting Hard, "Service Transmission" Light

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Mike T. · rep 0 · May 25, 2:43 AM · 1 replies · solved · Question

Vehicle: 2020 Buick Encore Preferred

My 2020 Buick Encore Preferred, with around 45,000 miles, has recently started shifting very hard, especially between 1st and 2nd gear. Sometimes it feels like it's slipping, then slams into gear, which is quite jarring.

The "Service Transmission" warning message popped up on the dash a couple of times, but then disappeared after a few minutes of driving. It's intermittent, but concerning.

I haven't noticed any fluid leaks, and the fluid level seems okay on the dipstick. Is this a common issue with these Encore transmissions? What could be causing this erratic shifting? I'm hesitant to drive it far like this, as it feels unsafe.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:43 AM

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ClearTheCode admin answer: Hard shifting and intermittent 'Service Transmission' warnings on a 2020 Buick Encore, especially at 45,000 miles, indicate a potential issue that should be investigated promptly. While you've checked the fluid level, the problem likely lies deeper.

Here are common causes for these symptoms in the Encore's transmission:

  1. Transmission Fluid Quality/Level: Even if the level appears okay, old, burnt, or contaminated transmission fluid can lead to poor shifting. A full flush and refill with the correct specification fluid might be necessary, but this should be done carefully as it can sometimes exacerbate existing issues if internal components are already worn.

  2. Transmission Control Module (TCM): The TCM is the computer that manages the transmission's operations. A faulty TCM can cause erratic shifting patterns, delayed engagement, or incorrect gear selections. Sometimes, a software update for the TCM can resolve these issues.

  3. Valve Body/Solenoids: The valve body contains a series of valves and solenoids that direct hydraulic fluid to engage different gears. If one or more solenoids are sticking or failing, it can cause harsh shifts or slipping. These are internal components that require professional diagnosis.

  4. Internal Wear: Less commonly at this mileage, but internal wear on clutch packs or bands could cause slipping and hard engagement. This is usually accompanied by specific diagnostic trouble codes (DTCs), often starting with P07xx.

When to See a Shop: Given the intermittent nature and the 'Service Transmission' warning, it's highly recommended to take your Encore to a dealership or a reputable transmission specialist as soon as possible. They can perform a diagnostic scan to retrieve specific transmission fault codes, which a generic OBD-II scanner might not pick up. These codes are crucial for accurately diagnosing the problem and preventing further, more costly damage to your transmission.

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