4L60e 1997 yukon 4wd

[johnnyz28]

I have a 4wd 1997 Gmc yukon slt with a 5.7 and a 4l60e trans i had it hooked to my buddy's mac tool scanner trying to figure out why it wont shift from 3 to 4 and so on it threw P0719 tcc/brake switch b low circuit so changed that because i know 4l60e wont shift right with that well it still hasnt when it goes to try to shift to 3 rd it almost actes like it goes into natural jumps rpms from like for a example 2000 rpm to 4000 to 4500 rpm but still pulling can not get it to shift thoughts please im almost to the point of saying its toast but i want to learn more about transmissions i can do everything thing else when it comes to build cars but have very little knowledge of a transmission thanks for any help

 

[mrrsm]

Welcome to GMT Nation....

Give these Dudes a Call during normal Business Hours @ (989) 891-9212 and run those symptoms by the people who encounter such issues every day... and know their way around the 4L60E A4 Transmission's *Innards* ...like the Backs Of Their Hands:

PS: They are located in the Central Michigan Area

GMC Yukon 1995-1997 Rebuilt Transmission 4L60E

GMC Yukon 1995-1997 Rebuilt Transmission 4L60E. A Transmissions are expertly rebuilt to factory specifications and include updates and a torque converter. 5 Year Unlimited Mileage Warranty! Buy yours today with A Transmissions! (989)891-9212

www.atransmissions.com

 

[johnnyz28]

Thank sir will they give any idea of which way i should go because they're a little to far away for me

 

[azswiss]

Suggest you do a full visual inspection on the wiring and connectors before you call it on the transmission. Pay particular attention to the grounds. The link below has a good summary.

P0719 OBD-II Trouble Code: Torque Converter/Brake Switch B Circuit Low

 

[johnnyz28]

Suggest you do a full visual inspection on the wiring and connectors before you call it on the transmission. Pay particular attention to the grounds. The link below has a good summary.

P0719 OBD-II Trouble Code: Torque Converter/Brake Switch B Circuit Low

Alright should i test light them to make sure everything is doing what is supposed to next question what site would be the best for a wire diagram thanks

 

[TJBaker57]

Have a look here. Holler if you need help finding what you need since it is not easy to locate stuff in this link...

Free Service Manuals for 1997 GMC vehicles | Operation CHARM

Detailed repair/service/workshop manuals for many 1997 GMC vehicles, including electrical diagrams, recommended bolt torques, and estimated labor times.

charm.li

 

[azswiss]

Start with a visual of all the wires & connectors going to the transmission followed by a check on the grounds. Make sure the ground wires are not corroded and the connections to the frame are free of rust/corrosion. Detailed wiring diagrams can be found at the link below:

Home >> GMC Truck >> 1997 >> Yukon 4WD V8-5.7L VIN R >> Repair and Diagnosis

From there, drill down into the appropriate diagrams:
Diagrams > Electrical Diagrams > Transmission Control Systems > 4L60-E Automatic Transmission

Looks like there are two brake switch diagrams so I would review both.

 

[johnnyz28]

Have a look here. Holler if you need help finding what you need since it is not easy to locate stuff in this link...

Free Service Manuals for 1997 GMC vehicles | Operation CHARM

Detailed repair/service/workshop manuals for many 1997 GMC vehicles, including electrical diagrams, recommended bolt torques, and estimated labor times.

charm.li

Thank so much ill start looking tonight i appreciate all your help

 

[johnnyz28]

Start with a visual of all the wires & connectors going to the transmission followed by a check on the grounds. Make sure the grounds wires are not corroded and the connections to the frame are free of rust/corrosion. Detailed wiring diagrams can be found at the link below:

Home >> GMC Truck >> 1997 >> Yukon 4WD V8-5.7L VIN R >> Repair and Diagnosis

From there, drill down into the appropriate diagrams:
Diagrams > Electrical Diagrams > Transmission Control Systems > 4L60-E Automatic Transmission

Looks like there are two brake switch diagrams so I would review both.

Thank you so much ill start looking tonight let yall know what i find