'09 Yukon Hybrid lurch from Auto Stop to Engine

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Aug 14, 2019 | 09:50 PM

#11

Tahoe_08

Pretty Darn Active Enthusiast

Joined: Mar 2019

Posts: 374

Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

It's actually normal for this to happen .. I would just put a tow hitch on there just in case a dumb idiot driver is following too close.

the hitch square is the first device to get hit anyways screw you California adding the ball changes NOTHING

Last edited by Tahoe_08; Aug 14, 2019 at 09:53 PM.

Sep 4, 2019 | 08:49 PM

#12

Tahoe_08

Pretty Darn Active Enthusiast

Joined: Mar 2019

Posts: 374

Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

Actually Check the battery Terminals on for the 12vDC

mine were loose and dirty they were flapping around in the wind (who ever installed it did a bad job)

the 12V had a engine off voltage of 11.9 (which is a fully discharged battery) with a OBD2 reader

DIC was reporting 12-13 with the engine on

after cleaning and making sure they were nice and sung it's reporting 15Volt-DC in the DIC

these Aux transmission pumps relies on the 12Volt battery and NEED high AMPERAGE and high voltage to run correctly 14.9volts 14.5-14.9volts

this is the only way the first and second gear can be primed... and ready

Just have some eye protection and banking soda mixed with water just in case you get battery acid on you...

these are cheap insurance and highly recommended if it shows any signs of acid leakage ..

before loose cables low voltage

Last edited by Tahoe_08; Sep 4, 2019 at 08:55 PM.

Aug 31, 2020 | 07:44 AM

#13

coreyhuggins

Enthusiast

Joined: Jan 2019

Posts: 6

Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

Quote:

Originally Posted by Tahoe_08

you can always bypass AutoStop by using M4 to disable auto surge feature

still get the good mpg

How do I do this? Thanks

Sep 2, 2020 | 04:13 AM

#14

dnt1010

Pretty Darn Active Enthusiast

Joined: Oct 2018

Posts: 297

From: TN

Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

Quote:

Originally Posted by Monza

You can spin tires in Hybrid mode or Manual?

Just regular drive and this is with oversize tires works best if you weight shift a bit (these things weigh 6000lbs) but throttle is very responsive and the Nitto Grapplers make a very large bark when rubbed against a pavement surface LOL. I try not to exercise the ole HO too much she has over 229k on her but she still has the "Kick" if you need it or want it.

Dec 1, 2020 | 06:42 PM

#15

Stollchc2

Enthusiast

Joined: Dec 2020

Posts: 6

From: Chicago

Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

Do you mean under the hybrid battery?

can you give me (a noob) a description on how to do this?

Quote:

Originally Posted by Tahoe_08

you can always bypass AutoStop by using M4 to disable auto surge feature

still get the good mpg

Quote:

Originally Posted by lt1gmc

I have corrected this problem a few times on my 09 by unplugging the connector that goes to the aux trans pump and replugging it in. I believe it resets the pump control module, similar to disconnecting the battery. I later found my 12 volt under hood batteries cable loose. Retightened and unplugged-replugged the connector for the aux pump module and havent had an issue since. Been 65,000 miles. The connector is under the battery and above the steering box, 4 larger wires, blue, red, yellow and grey.