2011 Tahoe no crank no start need help

[Rockman101]

Turn the key dash lights radio all work. No click. No power going to purple wire on starter.
Brought to a shop they through a new ECM, ignition and anti theft module in it. Didn't fix it. Told to come get it they don't know what else to do. Only charged for parts still 800$ but could of been worse.
Passlock stays on while trying to do key relearn light never goes out after 10 11 12 minutes heck even an hr.
Starter does turn over jumping the relay. Battery ground to block is good and clean. All fuses good. Read possibly bcm is bad. My code reader doesn't read bcm codes.
I even tried a different under hood fuse box.

I'm completely stumped!!!!

 

[swathdiver]

Turn the key dash lights radio all work. No click. No power going to purple wire on starter.
Brought to a shop they through a new ECM, ignition and anti theft module in it. Didn't fix it. Told to come get it they don't know what else to do. Only charged for parts still 800$ but could of been worse.
Passlock stays on while trying to do key relearn light never goes out after 10 11 12 minutes heck even an hr.
Starter does turn over jumping the relay. Battery ground to block is good and clean. All fuses good. Read possibly bcm is bad. My code reader doesn't read bcm codes.
I even tried a different under hood fuse box.

I'm completely stumped!!!!

Did the shop pull the BCM codes? Who do you know with a Tech-2 or other bi-directional scan tool?

 

[Joseph Garcia]

You will need a quality bi-directional scanner to troubleshoot without throwing more parts at it. One thought that I have is that the ignition switch may be failing. I had this happen with my 1997 Yukon (RIP).

 

[Doubeleive]

You need a scanner that can read the key position, could be a variety of things even a bad key. Stop throwing money at it as already noted, put your money in a scanner and troubleshoot if a shop took me for $800 and didn't fix it I would be pissed to say the least

 

[chooch502]

Hopefully you have the old modules so when you find a good technician he can replace them and fix your original problem. So after they replaced the ignition they swapped in an anti theft module then an ECM . Wow did they check for a camshaft or crank signal?
Were the "new" modules reprogrammed ?
Love to see the invoice for this piece of handiwork!

 

[davidavidd]

By passlock do you mean the anti-theft system?

 

[Rockman101]

Also to add security light doesn't go off doing relearn procedure.

 

[Rockman101]

Don't have access to a tech2 I own a few Chevy's so I should try to find one. Lots of sites sell them I've noticed. Im leaning is a theft deterrent problem

 

[Rockman101]

By passlock do you mean the anti-theft system?

Yes

 

[Rockman101]

You need a scanner that can read the key position, could be a variety of things even a bad key. Stop throwing money at it as already noted, put your money in a scanner and troubleshoot if a shop took me for $800 and didn't fix it I would be pissed to say the least

Solid plan. They did make new keys also.

 

[davidavidd]

Yes

It appears that the truck is in protected mode, if so this sequence of steps may help you.

what do you need? > cell phone's stopwatch app and a charger to keep your Tahoe's battery alive during the process. Follow the steps in exact order, if you fail in just one, start over.

On page 4 you can identify which system your truck has based on the key, I hope this helps, sorry for my broken English, it's not my native language.

 

[Rockman101]

It appears that the truck is in protected mode, if so this sequence of steps may help you.

what do you need? > cell phone's stopwatch app and a charger to keep your Tahoe's battery alive during the process. Follow the steps in exact order, if you fail in just one, start over.

On page 4 you can identify which system your truck has based on the key, I hope this helps, sorry for my broken English, it's not my native language.

I have tried this a few times but security light never turns off just stays lit

 

[mikez71]

Solid plan. They did make new keys also.

Did try old keys?

 

[Rockman101]

Did try old keys?

I did

 

[Rockman101]

Ordered a mid level scanner. Should help

 

[Rockman101]

Found a tan/black wire towards the back wire harness that had been cut than reconnected. I believe this is a gmlan + wire. But not for sure

 

[Rockman101]

Found this interesting no codes on scanner to reference.

 

[mikez71]

Weird that is under starter relay control. I haven't heard of a bad alternator preventing starting before..

When you say you jumped the starter relay, I am assuming you activated the relay and didn't bypass the starter relay?

 

[Rockman101]

Weird that is under starter relay control. I haven't heard of a bad alternator preventing starting before..

When you say you jumped the starter relay, I am assuming you activated the relay and didn't bypass the starter relay?

Ya I jumped pin 30 to 87. It also turns over with scanner command mode

 

[Rockman101]

Does have new ignition and theft module. Something is off though cannot get security light to turn off