murph21
New member
Question: Do 2023 TB models still have Active Fuel Management (cylinder deactivation) included? I read that they had stopped including it for a period due to chip shortage. Trying to determine if my '23 5.3L V8 has it. Thank you.
Active Fuel Management
- Thread starter murph21
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Guest1854
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Look at you window sticker. It will tell you if you have it or not. IF you don't have it then there's should be a credit for it.
It is called DFM, Dynamic Fuel Management now
It is called DFM, Dynamic Fuel Management now
Kentrucky TB
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My 22 refresh does not have it. Of course you can also look at your best MPG calculation and tell as well lol
PennStateLarry
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My 22 refresh does not have it. Was built in September of 22.
Kentrucky TB
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What’s your best MPG listing so far? I want to test my theory lol
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murph21
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I'll let you know. Have not had opportunity to do any long highway trips yet.
PennStateLarry
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My best without it is 22.8
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murph21
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what type of terrain? flat, hilly, moderate?
PennStateLarry
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I would say moderate. I'm in PA and was traveling from the Lehigh Valley up into the Poconos. It was pretty much all highway driving with a few elevation climbs.
Keller
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Holy crap. My truck with the 5.3 and Pulsar couldn't do 22.8 unless it was all downhill.
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Guest1854
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I have a 22 w/o DFM and so far my best is 24.3. That mostly highway driving in Ohio and WV.
PMW_fab
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My 2022 refresh LT didn't have the chip for DFM and I was pretty happy about that. Best I've gotten is 18ish, once you run over 70+ that 5.3 likes to drink fuel.
Kentrucky TB
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Yeah, I have no DFM and my best is 20.2 and I’ve yet to top it.
clstark7
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I don't believe it was ever temporarily cancelled. I believe auto stop/start was temporarily cancelled due to the chip shortage, but that is back too. Your 5.3 will have DFM, Dynamic Fuel Management. The difference from AFM is that it will shut all the way down to two cylinders, whereas AFM only shut down to four.
I personally immediately invested in the Pulsar LT to deactive DFM and auto stop/start. Now I honestly forget that my truck even has that function lol. A good tuner will also allow you to deactive those features.
