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Rough Shifting and Hesitation in 2018 S60 T6 - Transmission Issues?

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Mike T. · rep 0 · May 25, 3:53 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo S60 T6

Hi all,

I'm experiencing some concerning transmission behavior in my 2018 Volvo S60 T6, which has around 70,000 miles. Lately, the shifts have become noticeably rough and jerky, especially between 2nd and 3rd gear, and sometimes from 3rd to 4th. It's not smooth at all, and there's often a noticeable hesitation before the gear engages.

This problem seems to be more pronounced when the car is cold, but it doesn't entirely go away once warmed up. I haven't seen a check engine light yet, but the driving experience is definitely degraded. I'm worried about potential long-term damage.

Has anyone with a similar S60 experienced these kinds of transmission issues? Is this a known problem for the 8-speed automatic in these cars? Any thoughts on what might be causing it or what I should have checked?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:53 AM

0

ClearTheCode admin answer:

Rough shifting and hesitation in your 2018 Volvo S60 T6 can indeed be symptoms of various transmission-related issues. While the 8-speed Aisin automatic transmission (AWF8F45) in these Volvos is generally robust, problems can arise.

Here's a breakdown of common causes and diagnostic steps:

  1. Low or Contaminated Transmission Fluid: This is a primary suspect. Over time, transmission fluid can degrade or become contaminated, losing its lubricating and hydraulic properties. Low fluid levels can also cause pressure issues leading to harsh shifts. Volvo specifies a 'lifetime' fluid, but many technicians recommend inspection or even a drain/fill around your mileage.
  2. Transmission Software Glitch: Sometimes, the transmission control module (TCM) software can develop bugs or require an update. Volvo dealerships often have software updates that address shifting irregularities.
  3. Valve Body Issues: The valve body is the 'brain' of the transmission, directing fluid pressure to engage gears. Solenoids within the valve body can stick or fail, leading to delayed or harsh shifts. This is a more complex repair.
  4. Worn Clutch Packs/Internal Components: While less likely at 70,000 miles without a check engine light, internal wear could contribute to shifting problems. This would typically be a more expensive repair.
  5. Engine Mounts: Less common, but worn engine or transmission mounts can sometimes exacerbate the feeling of harsh shifts, making them seem more severe than they are.

When to See a Shop:

  • Immediately: If you notice any warning lights (even if not illuminated yet, a pending code might exist), hear grinding noises, or experience complete loss of a gear. Continued driving with significant transmission problems can lead to catastrophic failure.
  • Soon: It's highly recommended to have a qualified Volvo technician perform a diagnostic scan (even without a CEL, pending codes can exist), check the transmission fluid level and condition, and inspect for any software updates. They can also monitor live data from the transmission to identify any solenoid or pressure issues before they worsen.
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