'09 Yukon Hybrid lurch from Auto Stop to Engine - GreenHybrid - Hybrid Cars

'09 Yukon Hybrid lurch from Auto Stop to Engine

Old 10-02-2017, 02:07 PM
Thread Starter
Join Date: Sep 2016
Posts: 17
Red face '09 Yukon Hybrid lurch from Auto Stop to Engine

'09 Yukon, 120,600 miles

This...my vehicle is doing everything described below.

Customers may comment on either of two drivability concerns. Bumps, jerks and/or surges caused by the auxiliary pump which occur during a transition into, out of, or during an Auto Stop, as observed on the tachometer.

A lull (clutch slipping) followed by a kick (clutch grabbing) during acceleration while in Auto Stop or during a transition to Engine On. This condition typically occurs just before and engine restart is observed on the tachometer.Surge or lunge during deceleration below 25 mph with light to moderate braking. This typically occurs after the tachometer drops below idle speed to anter an Auto Stop. These concerns may be caused by an auxiliary transmission fluid pump concern or a slipping clutch within the transmission.

2 trips to GMC dealership with no diagnosis as reported issues cannot be duplicated, no codes. The 2nd trip they cleaned the throttle body which did nothing to resolve my issue. 3rd trip I provided the tech bulletin above. Issues could not be duplicated, no codes & the aux trans pump control module date code could not be found. Apparently it is located on a paper sticker that due to exposure to the elements is no longer on my module. Short of just throwing $$ at the problem and randomly replacing parts I don't know what to do. Any suggestions are appreciated!! I love this vehicle and was looking forward to driving it 200K+ but I cannot keep driving it like this.
Old 10-03-2017, 11:14 AM
Join Date: Oct 2013
Posts: 48
Default Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

See my reply to you in my other thread. Sorry to say most dealers are not so good at finding issues if there is not someone to show them the way. Not everything is in a book or on a list.
Old 01-27-2019, 05:13 PM
Join Date: Jan 2019
Posts: 1
Default Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

Mine is doing the exact same thing. What did the problem end up being? We need to fix it.
Old 01-27-2019, 07:39 PM
Join Date: Oct 2013
Posts: 48
Default Re: '09 Yukon Hybrid lurch from Auto Stop to Engine

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.
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