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2017 CT6 Rough Shifts - Time for Transmission Fluid Service?

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Mark S. · rep 0 · May 22, 4:02 AM · 1 replies · solved · Question

Vehicle: 2017 Cadillac CT6 Luxury

Hey everyone,

I've got a 2017 Cadillac CT6 Luxury with about 75,000 miles on it. Lately, I've noticed the shifts feeling a bit rougher, especially from 2nd to 3rd gear. It's not always consistent, but it's definitely more noticeable than it used to be.

I'm wondering if it's time to consider a transmission fluid and filter change. I've heard varying opinions on when to do this for modern transmissions. What's the recommended interval for the CT6, and is this something I can tackle myself or should I take it to a shop?

Any advice or experiences with similar issues on your CT6 would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:02 AM

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Hello Mark,

Rough shifts on your 2017 Cadillac CT6 at 75,000 miles could indeed point towards the need for a transmission fluid and filter service. While many modern transmissions are considered 'sealed for life,' manufacturers often have specific maintenance schedules for severe driving conditions, which can include city driving, towing, or extreme temperatures.

Causes of Rough Shifts:

  1. Degraded Transmission Fluid: Over time, transmission fluid breaks down, losing its lubricating and cooling properties. This can lead to increased friction and heat, causing rougher shifts.
  2. Clogged Transmission Filter: A dirty filter restricts fluid flow, leading to pressure issues within the transmission.
  3. Worn Clutch Packs/Solenoids: While less common at this mileage, worn internal components can also contribute to shifting problems.

Recommended Action Steps:

  1. Check Owner's Manual: Consult your 2017 CT6 owner's manual for the manufacturer's recommended transmission fluid service interval. Cadillac often recommends inspection at certain mileage points and replacement under severe service conditions, typically around 45,000-90,000 miles.
  2. Fluid Level and Condition Check: Before anything else, check the transmission fluid level and condition (if accessible). Low fluid or dark, burnt-smelling fluid is a clear indicator of a problem.
  3. Professional Diagnosis: Given the complexity of modern transmissions, it's highly recommended to have a qualified technician perform a diagnostic scan. They can check for any stored trouble codes (e.g., P0700 series codes related to transmission control) and perform a road test to pinpoint the issue.

When to See a Shop:

  • DIY Difficulty: Transmission fluid changes on many newer Cadillacs, especially the CT6, can be complex, often requiring specific tools, precise fluid levels, and sometimes even a scan tool to monitor fluid temperature during the fill procedure. It's generally not a simple drain-and-fill.
  • Diagnostic Expertise: If the fluid change doesn't resolve the issue, further diagnosis will be needed, which is best left to professionals.
  • Warranty Concerns: Improper service can void warranties on related components.

Addressing this promptly can help prevent more significant and costly transmission repairs down the line.

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