2026 TurboMax L3B 2.7L: AFM/DFM present/disablable? [2026 Silverado 1500WT: 4WD RC RB 2.7L]3GCNKAEK9TG345558

[bwiese]

Folks,

2026 Silverado 1500 WT:  2.7L TurboMax + 4WD;  regular cab & bed....

Love my new truck but difficult to tell if the 2026 TurboMax 2.7L on it:
- has or doesn't have AFM / DFM;
- if it has AFM/DFM, is it disableable by any product?
- will an AutoStop disablement product also disable AFM/DFM on this platform?

[Yes, I know AutoStop itself is disableable with a common device.]

I know people have found a new "E" in the VIN# on their V8s to determine this;  I could only find a
basic VIN parser that doesn't mention one way or another this capability/feature.

My VIN# is  3GCNKAEK9TG345xxx 

-Bill
 

[davester]

No, you still have DFM.  GM isn't shipping some w/o DFM.

 

You have latched onto some internet BS.

 

[GMCustomerService]

21 hours ago, bwiese said:

Folks,

2026 Silverado 1500 WT:  2.7L TurboMax + 4WD;  regular cab & bed....

Love my new truck but difficult to tell if the 2026 TurboMax 2.7L on it:
- has or doesn't have AFM / DFM;
- if it has AFM/DFM, is it disableable by any product?
- will an AutoStop disablement product also disable AFM/DFM on this platform?

[Yes, I know AutoStop itself is disableable with a common device.]

I know people have found a new "E" in the VIN# on their V8s to determine this;  I could only find a
basic VIN parser that doesn't mention one way or another this capability/feature.

My VIN# is  3GCNKAEK9TG345xxx 

-Bill
 

Those are great questions, Bill. Our team looked into your VIN and it doesn't appear to have AFM or DFM. Please know, we take the personal and private information of our customers seriously, and we don't recommend posting your full VIN publicly. As for Auto Stop, some vehicles have a button to turn Stop/Start off for one ignition cycle. If the vehicle is equipped with the Stop/Start deactivation switch, you can push the switch to turn off Stop/Start. Stop/Start is turned off when the LED indicator on the switch is not illuminated. If you have any further questions, please visit https://s.chevy.com/support-request and fill out the support request form with all pertinent details. This form helps our team gather the right information and ensures your request is routed appropriately. 

[bwiese]

20 hours ago, davester said:

No, you still have DFM.  GM isn't shipping some w/o DFM.

 

You have latched onto some internet BS.

 

Davester,

GMCustomerService responded to my post here (perhaps also below)
with this (nonpertinent text excised from quote).
 

Quote

"Our team looked into your VIN and it doesn't appear to have AFM or DFM....
As for Auto Stop, some vehicles have a button to turn Stop/Start off for one ignition cycle.  If the vehicle is equipped with the Stop/Start deactivation switch....."
 

 

Edited July 30 by bwiese

[bwiese]

Whoops!

From Jill @ GM service support:

Based on the information available, the L3B engines are equipped with Active Fuel Management (AFM). This is an integrated component of the L3B engine rather than a standalone feature, so it does not appear separately on the vehicle build."

Edited July 30 by bwiese

[newdude]

On 7/29/2026 at 3:29 PM, bwiese said:

Folks,

2026 Silverado 1500 WT:  2.7L TurboMax + 4WD;  regular cab & bed....

Love my new truck but difficult to tell if the 2026 TurboMax 2.7L on it:
- has or doesn't have AFM / DFM;
- if it has AFM/DFM, is it disableable by any product?
- will an AutoStop disablement product also disable AFM/DFM on this platform?

 

 

 

Yes.  The 2.7 Turbomax has Active Fuel Management.  It is NOT the same as the V8s.  Totally different system.  

 

Here is an article from GM when the 2.7 came out explaining the cylinder deactivation and the valve lift system.  Starts at the section called "SCS Valvetrain":

 

New Turbocharged 2.7L 4-Cylinder Engine Powers Full-Size Trucks – TechLink

 

 

On 7/29/2026 at 3:29 PM, bwiese said:

I know people have found a new "E" in the VIN# on their V8s to determine this;  I could only find a
basic VIN parser that doesn't mention one way or another this capability/feature.
 

 

 

This is an internet myth going around.  It was alleged that some 5.3s had this mystical 8th digit of the VIN as an "E" which somehow meant it had a new one year only 5.3 that didn't have DFM.  The writer of said article and the person that made the claim conveniently can't count because they posted the VIN.  The 8th digit was a "D" which meant its still the 5.3 with DFM.  The 9th digit of the VIN was an "E" and the 9th digit isn't the engine code.  At all.