Cylinder deactivation reliability, issues and how it works?
- Thread starter Kawzak
- Start date
Check out the spec sheet links in Copilot
Antoine
Administrator
Just a heads up here…It would be even more helpful for everyone and future readers of this thread (and threads in general) if the info was copy/pasted here for direct reference…Also that link may be temporary and it can’t be easily quoted etc…As a reminder for everyone…When possible, please provide as much direct info in your posts as possible, thanks!
Until I find out differently directly from Mazda Corp (I'm in the process of communicating with them on this matter), I am going to presume that my 2026 new gen CX-5 has CD because it does in fact have i-stop and IIRC, all of the gen 2's with CD also have i-stop and all without CD do not have i-stop.AI answer from 2 search engines:
Cylinder Deactivation in the 2026 Mazda CX-50
No, the 2026 Mazda CX-50 does not have cylinder deactivation. This feature has been eliminated for the 2026 model year, meaning that all models will operate without this technology.
Overview of Engine Options
The 2026 Mazda CX-50 offers several engine configurations, but none include cylinder deactivation:
Engine Type Description Power Output Non-Turbo SKYACTIV-G® 2.5L 4-cylinder 187 hp Turbo SKYACTIV-G® 2.5 Turbo engine Up to 256 hp Hybrid 2.5L 4-cylinder Hybrid engine 176 hp Key Features of the 2026 Mazda CX-50
The removal of cylinder deactivation aligns with Mazda's focus on reliability and performance for the 2026 model year.
- Performance: The CX-50 is designed for confident traction and responsive handling.
- All-Wheel Drive: Available i-ACTIV All-Wheel Drive enhances control in various conditions.
- Safety: Equipped with advanced safety features, including Blind Spot Monitoring and Lane Keep Assist.
and:
Copilot
Short answer:
Some 2026 CX‑50 models (non‑turbo 2.5L gas): Yes, they have cylinder deactivation
Turbo models: No cylinder deactivation
According to Mazda’s 2026 CX‑50 specification data:
Details
- The standard 2.5L naturally aspirated SKYACTIV‑G engine does include cylinder deactivation (CDA). [filecache....iaroom.com]
- The turbocharged 2.5L engine does NOT list cylinder deactivation (Mazda typically omits CDA on turbo engines). [filecache....iaroom.com], [youtube.com]
- The new hybrid models don’t use cylinder deactivation at all, since they shut the engine off entirely when possible instead of deactivating cylinders. [cx50forums.com]
You may see conflicting info online because:
Why there’s confusion
But the official 2026 spec sheet clearly shows it’s still present on the non‑turbo gas engine.
- Mazda has been inconsistent about CDA across years and trims
- Some earlier CX‑50 trims (or certain VIN builds) didn’t have it
- There are rumors/speculation that Mazda is phasing it out on some newer engines
- If you’re looking at a 2026 CX‑50 2.5 S (non‑turbo) → Yes, it likely has cylinder deactivation
- If you want to avoid it → go with:
- Turbo model, or
- Hybrid
If you want, tell me the exact trim you’re considering and I’ll confirm 100% whether that specific one has it.
I asked my Mazda sales rep today if my 2026 has CD and she said that it is her understanding that all new gen CX-5s will have CD, yet there is no printed documentation on the window sticker or on the official Mazda website.
The mystery continues but I will get to the bottom of this hopefully sooner than later.
lol, here's a builder-price thing off the Mazda website for a 2026 CX5, click the standard features tab at the bottom::
Mazda Build & Price Your Vehicle
Interior
Black Cloth
Packages
NoneAccessories
NoneStandard Features
- CX-5 2.5 S Engine Features:
- SKYACTIV®-G 2.5 DOHC 16-valve 4-cylinder
26
with Cylinder Deactivation and i-Stop - SKYACTIV®-Drive
26
6-speed automatic transmission with manual shift and Sport Mode - SKYACTIV-VEHICLE DYNAMICS with G-Vectoring Control Plus
- i-ACTIV AWD® all-wheel drive system
- Mazda Intelligent Drive Select (Mi-Drive) (Sport and Off-road modes)
- EPA-estimated city/highway mpg: 24/30
27 - CX-5 2.5 S FEATURES:
- 17" Aluminum-alloy wheels with Gray Metallic finish
- P225/65 R17 all-season tires
- LED headlights with auto-leveling
I know, its going back and forth, lol!
Thank you for sharing this. What model/year is this image from? Is this your vehicle? If so does yours have CD and what is the 8th character of the VIN?
No. I don't have a CD vehicle.
Not sure what model year.. it was posted on Reddit thread at bottom of image.
If one could find the part number for this solenoid they could start looking up '26 VINs online and see if that PN applies to that vehicle.
Not sure what model year.. it was posted on Reddit thread at bottom of image.
If one could find the part number for this solenoid they could start looking up '26 VINs online and see if that PN applies to that vehicle.
Can you pop the hood of yours and take a pic similar to the one you've posted so that we have a comparison to see?
I popped the hoods on our '24 CX-5 with "L" in the VIN (no CD) and my 2026 new gen CX-5 with an "A" in the VIN (8th character).
Neither of them have these solenoids, part # PYFA-12360.
I am attaching a diagram as well.
That's the quote I shared above. I hope it's true. But if it is, odd that the vehicle would have i-stop and not CD.I found a post from Mazda US (supposedly official account) on redit saying the US models do not have CD indeed.
Very interesting and great news I guess
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