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Obs Auto Trac Dash Switch

silversport

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silversport Enthusiast

silversport

Posted
Posted

I'm getting the Service 4WD light on my 2000 Escalade (think 1999 Tahoe/Yukon gr_grin.gif)...

I cannot make the truck go into 4 Low (light just blinks) and I cannot hear the front differential engage when I push 4 Hi (but it will change and light up)...

From what I can find here doing the search, it is quite possible that this is just the switch having the problem and not the differential...I have had intermittent lighting of the switch (2 Hi*Auto*4 Hi*4 Low) when the headlights are on so this seems to have just progressed...

 

The Problem: What is this part actually called and what is the part number???...mine has Lucas 551079 Z-0191 15027104 written on it but I have been unsuccessful in finding this part listed online...I plan to do the change myself so the dealership is probably out based on the last parts I needed, their pricing and so on...

 

I have found a part called the transfer case shift switch but that has no pic and other pics I found look like a mechanical switch and not this dash switch...another site showed a part listed as TCA22 for $120.79 but this also had no pic and seems to be the price of the part for the differential and not for the dashboard...

 

A check on the 'Bay showed one of these with no description on whether or not the part even works...

 

Any help would be appreciated...I am hoping to do what appears to be an easy swap out and hopefully fix quick...

 

Thanks,

 

Bill

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted
I'm getting the Service 4WD light on my 2000 Escalade (think 1999 Tahoe/Yukon gr_grin.gif)...

I cannot make the truck go into 4 Low (light just blinks) and I cannot hear the front differential engage when I push 4 Hi (but it will change and light up)...

From what I can find here doing the search, it is quite possible that this is just the switch having the problem and not the differential...I have had intermittent lighting of the switch (2 Hi*Auto*4 Hi*4 Low) when the headlights are on so this seems to have just progressed...

 

The Problem: What is this part actually called and what is the part number???...mine has Lucas 551079 Z-0191 15027104 written on it but I have been unsuccessful in finding this part listed online...I plan to do the change myself so the dealership is probably out based on the last parts I needed, their pricing and so on...

 

I have found a part called the transfer case shift switch but that has no pic and other pics I found look like a mechanical switch and not this dash switch...another site showed a part listed as TCA22 for $120.79 but this also had no pic and seems to be the price of the part for the differential and not for the dashboard...

 

A check on the 'Bay showed one of these with no description on whether or not the part even works...

 

Any help would be appreciated...I am hoping to do what appears to be an easy swap out and hopefully fix quick...

 

Thanks,

 

Bill

 

You can always contact customer service via email at www.gmpartsdirect.com and describe to them what you are searching for and provide them w/ your VIN. They will get back to you within a few days with the answer.

silversport Enthusiast

silversport

Posted
  • Author
Posted

okay...thanks...seems from threads that this is a common problem with these trucks and was hoping one of the many who changed this over would have the part number...thanks again,

Bill

dwhults Enthusiast

dwhults

Posted
Posted
I'm getting the Service 4WD light on my 2000 Escalade (think 1999 Tahoe/Yukon gr_grin.gif)...

I cannot make the truck go into 4 Low (light just blinks) and I cannot hear the front differential engage when I push 4 Hi (but it will change and light up)...

From what I can find here doing the search, it is quite possible that this is just the switch having the problem and not the differential...I have had intermittent lighting of the switch (2 Hi*Auto*4 Hi*4 Low) when the headlights are on so this seems to have just progressed...

 

The Problem: What is this part actually called and what is the part number???...mine has Lucas 551079 Z-0191 15027104 written on it but I have been unsuccessful in finding this part listed online...I plan to do the change myself so the dealership is probably out based on the last parts I needed, their pricing and so on...

 

I have found a part called the transfer case shift switch but that has no pic and other pics I found look like a mechanical switch and not this dash switch...another site showed a part listed as TCA22 for $120.79 but this also had no pic and seems to be the price of the part for the differential and not for the dashboard...

 

A check on the 'Bay showed one of these with no description on whether or not the part even works...

 

Any help would be appreciated...I am hoping to do what appears to be an easy swap out and hopefully fix quick...

 

Thanks,

 

Bill

 

 

That is your part number. Search gmpartsdirect.com and it will have switch as the description. It is very easy to change the switch. You can also get the code scanned to make life easier. You will get a Tcase code and it will say exactly whats wrong. I had to change my TCCM, C0315 was my code. (do you here a clicking when you turn the key? If you do then it works) and that was easy as well. The TCCM is the brain for the 4wd. If that is your problem then change it yourself. The dealer wanted $600 and the part is $350. It is right above the pedals more towards the drivers side.

 

Also to make the truck go into 4 low you MUST be rolling over 1 MPH and under 5 MPH. Let's say you press 4 LOW at 15 MPH. The light will blink for 10 seconds until you are rolling under 5 MPH. If you do not go under 5 MPH it will stop blinking and switch back to whatever you were in. This is a safety feature so you don't ruin the drivetrain.

silversport Enthusiast

silversport

Posted
  • Author
Posted

thanks...I tried that at an AC parts and got nothing...I guess I was looking at the wrong site...thanks again...I can hear the switch click as it changes (it is stubborn) but I don't hear the little clunk that the front differential is engaging...thanks...this was a big help...

Bill :(

dwhults Enthusiast

dwhults

Posted
Posted
thanks...I tried that at an AC parts and got nothing...I guess I was looking at the wrong site...thanks again...I can hear the switch click as it changes (it is stubborn) but I don't hear the little clunk that the front differential is engaging...thanks...this was a big help...

Bill :(

 

Cool. Did you try to engage 4 LOW like I mentioned? That's the only way it will engage.

silversport Enthusiast

silversport

Posted
  • Author
Posted

I tried...it didn't go into 4 Low...whichever it is, solenoid, switch (or both) it worked for a bit yesterday...I could hear/feel it engage the front differential but then it stopped working again...waiting on a price for the switch from one dealership and making an appointment to have it scanned at the place I get work done...

 

Thanks,

 

Bill

silversport Enthusiast

silversport

Posted
  • Author
Posted

new part number for the Transfer Case Control Switch if anyone interested...

19168765

My part will be enroute to me in the morning...

Thanks,

Bill

silversport Enthusiast

silversport

Posted
  • Author
Posted

Part arrived from UPS minutes ago...disconnected old switch...plugged in new switch...check for function: 2 Hi, Auto, 4 Hi, 4 Low...turn on headlights, switch backlights perfectly...and it is just that easy.

 

I had no idea GM still made this switch (19168765) and looked on ebay...for not much more than an unwarranted old part (probably has the same problem as mine as I read this is a common ill) off of ebay I have a new Genuine GM part installed and my 2000 Cadillac Escalade (Tahoe putting on airs ;) is back running like it should.

 

Thanks so much...even though I am just outside Chicago Illinois I ONLY buy my GM parts from Fichtner Chevrolet and Bob Wendorff (since 2001)

 

Thanks again,

 

Bill

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