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Rough Shifting on my 2018 XC90 T6 - Transmission Fluid?

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Heather Y. · rep 0 · May 22, 5:19 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo XC90 T6 Inscription

Hey everyone, I've noticed my 2018 Volvo XC90 T6 Inscription has been shifting a bit rough lately, especially from 2nd to 3rd gear. It feels like there's a slight hesitation and then a jolt. The car has about 75,000 miles on it now.

I've been wondering if it's time for a transmission fluid change. I know Volvo often says 'lifetime fluid,' but I've heard that's not always the best advice for longevity.

Has anyone else experienced this with their XC90? Is changing the transmission fluid something a competent DIYer can tackle, or is it best left to the dealership? Any specific fluid recommendations or things to watch out for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:19 AM

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ClearTheCode admin answer:

Rough shifting in your 2018 Volvo XC90 T6 at 75,000 miles is a common concern, and while Volvo often states 'lifetime' for transmission fluid, many experts and owners recommend a service interval, especially under harder driving conditions.

Here's what to consider:

  1. Transmission Fluid Service:

    • Recommendation: For optimal longevity, many independent Volvo specialists recommend a transmission fluid drain and fill every 60,000-80,000 miles, particularly for vehicles driven in stop-and-go traffic or with towing.
    • Fluid Type: It's crucial to use the correct Volvo-specified transmission fluid (e.g., AW-1 for Aisin Warner transmissions). Using the wrong fluid can cause significant damage.
    • DIY vs. Professional: While a drain and fill can be done by an experienced DIYer, it's not as simple as an engine oil change. Proper fluid level checking often requires specific procedures (e.g., at a certain temperature range) and sometimes specialized tools. A full flush is typically a job for a professional shop.

  2. Potential Causes of Rough Shifting:

    • Low or Degraded Fluid: The most common cause. Old fluid loses its lubricating and cooling properties.
    • Transmission Solenoids: These electronic valves control fluid flow. If they're sticking or failing, they can cause shifting issues.
    • Software Glitch: Sometimes, a transmission control module (TCM) software update can resolve minor shifting anomalies.
    • Mechanical Wear: Less common at 75k miles, but possible if maintenance has been neglected.

  3. When to See a Shop:

    • If you notice any warning lights on your dashboard (e.g., 'Transmission Service Required').
    • If the rough shifting is accompanied by unusual noises, burning smells, or a complete loss of a gear.
    • If you're not comfortable with the specific procedures for checking and filling transmission fluid, it's always safer to have a qualified Volvo technician perform the service. They can also check for any diagnostic trouble codes (DTCs) that might indicate a deeper issue, even if no warning light is present. Common codes related to transmission issues might include P0700 (Transmission Control System Malfunction) or specific solenoid performance codes.
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