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Harsh Shifts and Shudder on my 2019 Volvo S90 T5 - Transmission Issue?

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David L. · rep 0 · May 25, 3:58 AM · 1 replies · solved · Question

Vehicle: 2019 Volvo S90 T5 Momentum

I've been experiencing some concerning issues with the automatic transmission in my 2019 Volvo S90 T5 Momentum. Specifically, I notice harsh shifts, particularly from 2nd to 3rd gear, and sometimes a slight shudder or hesitation when accelerating from a stop or at lower speeds. It's not constant, but it's happening more frequently.

The car has about 60,000 miles on it, and I'm not sure if the transmission fluid has ever been changed. Could this be a fluid issue, or something more serious with the 8-speed Aisin transmission?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:58 AM

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The harsh shifts and shudder you're experiencing in your 2019 Volvo S90 T5 are definitely symptoms that require attention, especially with the 8-speed Aisin automatic transmission. While these transmissions are generally robust, issues like yours can arise from several factors.

Common causes for these symptoms include:

  1. Transmission Fluid Condition: If the transmission fluid is old, degraded, or low, it can lead to poor lubrication, increased friction, and ineffective hydraulic pressure, resulting in harsh shifts and shudder. Volvo considers the transmission fluid "lifetime" in many cases, but many experts recommend a drain and fill between 60,000-100,000 miles for optimal performance, especially under severe driving conditions.
  2. Software Issues: The transmission control module (TCM) relies on sophisticated software to manage shift points and clutch engagement. Glitches or outdated software can lead to erratic shifting behavior. Volvo has released software updates for transmission performance in various models.
  3. Valve Body Problems: The valve body is the "brain" of the automatic transmission, directing fluid pressure to engage clutches and bands. Wear or contamination in the valve body can cause sticking valves, leading to harsh shifts or delays.
  4. Torque Converter: A failing torque converter can cause shudder, especially at consistent speeds or during acceleration, as it struggles to efficiently transfer power from the engine to the transmission.

When to see a shop: You should schedule an appointment with a Volvo dealership or a reputable transmission specialist as soon as possible. Driving with these symptoms can potentially exacerbate the problem and lead to more costly repairs. They will typically:

  • Check for any stored diagnostic trouble codes (DTCs) such as P0700 (Transmission Control System Malfunction) or P0730 (Incorrect Gear Ratio).
  • Inspect the transmission fluid level and condition.
  • Perform a diagnostic scan to check for any software updates for the TCM.
  • Conduct a road test to observe the shifting behavior under various conditions. Addressing this proactively can often prevent a minor issue from becoming a major transmission overhaul.
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