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2019 Traverse LT Transmission Shudder/Harsh Shifts - Is This Normal?

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Mike T. · rep 0 · May 24, 1:18 PM · 1 replies · solved · Question

Vehicle: 2019 Chevrolet Traverse LT

Hey everyone,

I've got a 2019 Chevrolet Traverse LT with about 65,000 miles on it, and lately, I've been noticing a weird shudder, especially when accelerating lightly between 30-50 mph, or during what feels like the 2nd to 3rd or 3rd to 4th gear shifts. It's not a violent jerk, but definitely a noticeable vibration that feels like it's coming from the drivetrain.

Is this a common issue with these 9-speed transmissions in the Traverse? I've heard some chatter about GM transmissions having issues, but I'm not sure if it applies to my model year. It's a bit unsettling, and I'm wondering if it's something I should be seriously concerned about or if it's just a characteristic of the vehicle.

Has anyone else experienced this with their 2019 Traverse or similar GM vehicles? What was the fix, if any? Should I be looking into a transmission fluid flush or something more serious?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 1:18 PM

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ClearTheCode admin answer: It sounds like you're describing a common complaint with certain GM 8-speed and 9-speed automatic transmissions, including those found in your 2019 Chevrolet Traverse LT. This 'shudder' or harsh shifting is often a sign of a few potential issues.

  1. Causes of Transmission Shudder:

    • Torque Converter Clutch (TCC) Issues: This is a very common culprit. The TCC can experience wear or degradation, leading to shuddering, especially during light acceleration or when maintaining a steady speed.
    • Transmission Fluid Degradation: Over time, the transmission fluid can break down, losing its lubricating and friction modification properties. GM has even released updated fluids to address this.
    • Software Calibration: Sometimes, the transmission control module (TCM) software can contribute to shifting irregularities. Updates are often released to improve shift quality.

  2. What You Can Do / Potential Solutions:

    • Check for Technical Service Bulletins (TSBs): For many GM vehicles with 8-speed and 9-speed transmissions, there are TSBs related to shuddering. Specifically, TSB 18-NA-355 often applies, which recommends a special "triple flush" procedure using a specific new transmission fluid (Mobil 1 Synthetic LV ATF HP). This fluid is designed to mitigate the shudder.
    • Software Update: Ensure your vehicle's transmission control module (TCM) has the latest software calibration. This can sometimes resolve minor shifting complaints.
    • Torque Converter Replacement: If the fluid flush and software update don't resolve the issue, a failing torque converter might need replacement. This is a more involved repair.

  3. When to See a Shop:

    • You should schedule an appointment with a trusted mechanic or Chevrolet dealership as soon as possible. While a slight shudder might not immediately strand you, ignoring it can lead to more severe transmission damage over time.
    • Even if no check engine light (CEL) is on, a qualified technician can scan for pending or historical transmission-related diagnostic trouble codes (DTCs) that might not be visible to a standard OBD-II scanner. Common codes related to TCC issues include P0741 (Torque Converter Clutch Circuit Performance - Stuck Off) or P2757 (Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance or Stuck Off).
    • Discuss the TSB 18-NA-355 with the service advisor, as it's a well-known procedure for this problem.
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