The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Harsh Shifting and Hesitation in 2017 S90 T6 - Transmission Concerns

0

Nicole W. · rep 0 · May 22, 5:12 AM · 1 replies · solved · Question

Vehicle: 2017 Volvo S90 T6 Inscription

Hello fellow Volvo owners,

I'm reaching out because I've been experiencing some concerning transmission behavior in my 2017 Volvo S90 T6 Inscription. The car has about 75,000 miles on it, and recently, the shifts have become noticeably harsh, especially between 2nd and 3rd gear, and sometimes from 3rd to 4th.

It's not just harsh; there's also a noticeable hesitation before it finally engages the next gear, almost like it's thinking about it for too long. Occasionally, I'll feel a slight clunk when coming to a stop or accelerating from a standstill. There's no check engine light on, but this definitely doesn't feel right.

Has anyone with the 8-speed automatic transmission in their S90 or similar model experienced these kinds of issues? What was the resolution? I'm hoping it's not a major transmission overhaul.

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

Harsh shifting, hesitation, and clunking in your 2017 Volvo S90 T6's 8-speed automatic transmission are symptoms that warrant immediate attention. While a check engine light isn't on, the transmission control module (TCM) might have stored fault codes that don't trigger the dashboard light.

Potential Causes:

  1. Low or Contaminated Transmission Fluid: The most common and often overlooked cause. Low fluid levels or degraded fluid can lead to poor lubrication and hydraulic pressure issues, causing harsh shifts. Volvo often states 'lifetime' fluid, but many specialists recommend a drain and fill around 60,000-80,000 miles for optimal performance.
  2. Software Glitch/Adaptation Issues: The transmission control module (TCM) learns your driving style. Sometimes, a software update or a transmission adaptation reset can resolve erratic shifting patterns. This is often done at the dealership.
  3. Valve Body Issues: The valve body is responsible for directing transmission fluid to the correct clutches. Wear or blockages in the solenoids or passages within the valve body can cause delayed or harsh shifts.
  4. Worn Clutch Packs: Less common at 75,000 miles without severe abuse, but worn internal clutch packs can lead to slipping and harsh engagement.

What to Do:

  1. Check Transmission Fluid (if possible): Some Volvo models have sealed transmissions, making this difficult for DIYers. If accessible, check the fluid level and condition. It should be reddish and clear, not dark brown or burnt-smelling.
  2. Professional Scan: Even without a check engine light, a Volvo-specific diagnostic tool (like VIDA) can read transmission-specific fault codes and live data from the TCM.

When to See a Shop:

It's crucial to have your S90 inspected by a Volvo-trained technician or a reputable transmission specialist. Ignoring these symptoms can lead to more severe and costly transmission damage. They can perform a diagnostic scan, check fluid levels and condition, and determine if a software update, adaptation reset, or more extensive repair (like a valve body replacement) is necessary. Do not delay, as transmission issues tend to worsen over time.

Menu

Help & account