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2020 S60 T5 Rough Shifting and Jerking - Transmission Issue?

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Mike T. · rep 0 · May 22, 5:12 AM · 1 replies · solved · Question

Vehicle: 2020 Volvo S60 T5 Momentum

I've noticed some concerning behavior with the transmission in my 2020 Volvo S60 T5. It has the 8-speed automatic, and lately, it's been shifting very roughly, especially at lower speeds or when downshifting. Sometimes it feels like a hard jerk, almost like someone bumped me from behind.

It's most noticeable when going from a stop or slowing down to a near stop and then accelerating again. There's a distinct hesitation followed by a clunk or jerk. It's not consistent, but it's happening more frequently now.

Is this a known issue with these transmissions? Could it be a software problem, or something more serious with the transmission itself? Any advice would be appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:12 AM

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ClearTheCode admin answer:

Rough shifting and jerking in your 2020 Volvo S60 T5's 8-speed automatic transmission is a common complaint that can stem from various sources, ranging from minor software glitches to more significant mechanical issues.

Potential Causes:

  • Transmission Software Glitch: Volvo often releases software updates to refine transmission shifting logic. An outdated or corrupted software version can lead to erratic behavior.
  • Low or Contaminated Transmission Fluid: Incorrect fluid levels or degraded fluid can impair proper hydraulic operation within the transmission.
  • Valve Body Issues: The valve body controls the flow of transmission fluid to engage gears. Malfunctions here can cause harsh shifts.
  • Mechatronics Unit Failure: This integrated unit combines the transmission's electronic control unit and hydraulic control unit. Issues here can severely impact shifting.
  • Worn Clutch Packs or Solenoids: While less common in newer vehicles, wear in these components can lead to poor engagement.

Diagnostics & Next Steps:

  1. Check for Software Updates: This is often the first and simplest fix. Volvo dealerships can check if there are any pending transmission control module (TCM) software updates for your specific VIN.
  2. Inspect Transmission Fluid: A technician can check the fluid level and condition. Note that many modern transmissions are 'sealed for life,' but fluid can still degrade or leak.
  3. Scan for Codes: Even without a check engine light, a professional scanner can often pull 'pending' or 'history' codes from the TCM that might indicate specific solenoid or sensor issues.
  4. Adaptive Learning Reset: Sometimes, resetting the transmission's adaptive learning values can help it 're-learn' optimal shift points, especially after repairs or if driving habits have changed.

When to See a Shop:

If the rough shifting is persistent, worsening, or accompanied by any warning lights (like a transmission warning or check engine light), it's crucial to have your S60 inspected by a Volvo specialist. Ignoring transmission issues can lead to more extensive and costly repairs down the line. A dealership or an independent shop with Volvo diagnostic capabilities can accurately diagnose the root cause and recommend the appropriate solution, whether it's a software update, fluid service, or a component replacement.

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