Auto Stop/Start Defeat Issues - TerrainForum.net: GMC Terrain Forum
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post #1 of 13 (permalink) Old 10-12-2019, 03:55 PM Thread Starter
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Auto Stop/Start Defeat Issues

Nearly two months in I am ambivalent about this feature. I don't mind it most of the time. I know it improves fuel economy/reduces emission. My biggest complaint is when it shuts off in warm weather (80 to 90 degrees) and then has to restart before the light turns. The resulting shudder is annoying.Here's the rub. I can't fathom why GM (or anybody else), would install this feature unless it gave them a measurable CAFE/emissions benefit on the EPA dyno certification test. If so, then I know the EPA will never allow an overt defeat mechanism to exist and will punish severely a covert mechanism (just ask Volkswagen). That is why it is illegal for a muffler shop to install a "test pipe" in place of a catalytic converter. They generally tolerate aftermarket devices as long as they are owner installed and most local emission testing required for vehicle registration won't catch something like this.I don't doubt any of the reports here about new vehicles coming with switches disabling the feature, I am just flummoxed as to how it is happening.

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post #2 of 13 (permalink) Old 10-12-2019, 10:14 PM
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Several ways to defeat this useless function are covered in the forum. I opted for the relay that installs in the circuit to the hood latch switch. Works great. Hopefully, future NOX models will have a defeat switch on the dash. Would not have bought the NOX if I could not have defeated this function.
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post #3 of 13 (permalink) Old 10-13-2019, 01:06 PM
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If so, then I know the EPA will never allow an overt defeat mechanism to exist and will punish severely a covert mechanism (just ask Volkswagen). I don't doubt any of the reports here about new vehicles coming with switches disabling the feature, I am just flummoxed as to how it is happening.
This is something that I have been watching quite closely.
More and more vehicles are coming out without stop/start or a switch to turn it off.
JayTee's 2019 GMC, my 2018 Encore, and the 2020 Blazer (all three engines) are a few that come to mind.
As to which ones get the override and which ones don't is a mystery.

On a related note, cylinder deactivation used to always disable the same cylinders.
Some new models now can rotate different cylinders that get deactivated.
Changes are being made.

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post #4 of 13 (permalink) Old 10-13-2019, 06:23 PM
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If so, then I know the EPA will never allow an overt defeat mechanism to exist and will punish severely a covert mechanism (just ask Volkswagen). I don't doubt any of the reports here about new vehicles coming with switches disabling the feature, I am just flummoxed as to how it is happening.
On a related note, cylinder deactivation used to always disable the same cylinders.
Some new models now can rotate different cylinders that get deactivated.
Changes are being made.
Does the Blazer rotate cylinders? And while this certainly sounds like a good idea (and something I thought they were already doing, BTW), the *implementation* makes me a bit leery.

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post #5 of 13 (permalink) Old 10-13-2019, 07:53 PM
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Does the Blazer rotate cylinders? And while this certainly sounds like a good idea (and something I thought they were already doing, BTW), the *implementation* makes me a bit leery.
,

The new rotating cylinder program is called Dynamic Fuel Management, as opposed to the older Active Fuel Management.
It started in 2019 in the full size pickups with the V-8's.

In 2020 it expanded to the Camaro, Cadillac, etc.
I don't think it made it in the 2020 Blazer but the stop/start override did.

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Last edited by rednox301; 10-13-2019 at 08:55 PM.
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post #6 of 13 (permalink) Old 10-14-2019, 12:00 PM
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2019 1.5T 'Nox here. AutoStart working as designed. Do I like it? I could live without it, and have for decades. Here we have a motor that uses - what? - <1gal/hr at idle? The fact that some models sold with it include a defeat function tells me the fuel savings are tiny, if any. Every car I've ever driven has had its own quirks in operation. Like AutoStop/Start[?]. Props to the engineers for its seamless operation, but I'd like to see some figures on real world gas savings. Just my $.02.
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post #7 of 13 (permalink) Old 10-14-2019, 02:51 PM
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2019 1.5T 'Nox here. AutoStart working as designed. Do I like it? I could live without it, and have for decades. Here we have a motor that uses - what? - <1gal/hr at idle? The fact that some models sold with it include a defeat function tells me the fuel savings are tiny, if any. Every car I've ever driven has had its own quirks in operation. Like AutoStop/Start[?]. Props to the engineers for its seamless operation, but I'd like to see some figures on real world gas savings. Just my $.02.
I look at these kinds of things as being designed for the "Collective Good", not necessarily your good. Your benefit is purely collateral, but you are asked to tolerate the nuisance factor along the way ... and some people (including me) don't want to do that ... because the nuisance factor outweighs the benefit to me .

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2002 Impala 1LT (new Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /225.5k miles [05-NOV-2019]
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post #8 of 13 (permalink) Old 10-14-2019, 03:08 PM
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I look at these kinds of things as being designed for the "Collective Good", not necessarily your good. Your benefit is purely collateral, but you are asked to tolerate the nuisance factor along the way ... and some people (including me) don't want to do that ... because the nuisance factor outweighs the benefit to me .

Agreed, Hero. Not even sure if there's any good, mine or collective happening here.
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post #9 of 13 (permalink) Old 10-14-2019, 07:59 PM
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There's got to be a simpler way to defeat the auto stop/start. Has anyone tried just unplugging the connector that goes to the hood latch switch?
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post #10 of 13 (permalink) Old 10-14-2019, 11:02 PM
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And then remote start and some other things will not work.

Plus the annoying light/message on the DIC saying hood is open.

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