USB Issue - 2021 Sierra 1500

[MB2021SIERRA]

My USB-C/USB-A port receptacle (13529873) stopped working on my 2021 Sierra 1500.

 

-Fuse wasn’t blown

-Replaced the actual receptacle and that wasn’t the issue

-Tested the F26 fuse with a light and there’s no power making it to the fuse

-Disconnected/Reconnected the battery

-(updated) Tried the K2 relay and it wasn’t the issue

I’ve attached the codes that popped up on the DTC report.

Any suggestions on where to look next?

Edited May 7, 2023 by MB2021SIERRA

[rbau]

Welcome to the site!

No power to F26 --> check relay K2.

 

F26 or 'F26DR' in GM speak is powered by relay K2

(in)conveniently mounted on the backside of the fuse block.

 

If you can read a wiring diagram the Body Builder

manual from the GM Upfitter site is your friend.

 

Good luck and let us know what you find out.

[MB2021SIERRA]

39 minutes ago, rbau said:

Welcome to the site!

No power to F26 --> check relay K2.

 

F26 or 'F26DR' in GM speak is powered by relay K2

(in)conveniently mounted on the backside of the fuse block.

 

If you can read a wiring diagram the Body Builder

manual from the GM Upfitter site is your friend.

 

Good luck and let us know what you find out.

Thanks for the advice. I tried the K2 and it wasn’t the problem. 
 

Any other ideas?

[rbau]

Attached the wiring diagram for this circuit.

 

Pull relay K2, examine the socket for

a pin that may have backed out.

Test the socket pins using

a test light or multi-meter:

 

with engine off:

-Pin 30 has 12v at all times

-Pin 86 has continuity to ground

 

with engine running:

-Pin 85 has 12v

20_Sierra_1500_Electrical_Body_Buil-pg7-764.pdf

[GMCustomerService]

On 5/5/2023 at 1:53 PM, MB2021SIERRA said:

My USB-C/USB-A port receptacle (13529873) stopped working on my 2021 Sierra 1500.

 

-Fuse wasn’t blown

-Replaced the actual receptacle and that wasn’t the issue

-Tested the F26 fuse with a light and there’s no power making it to the fuse

-Disconnected/Reconnected the battery

-(updated) Tried the K2 relay and it wasn’t the issue

I’ve attached the codes that popped up on the DTC report.

Any suggestions on where to look next?

This is certainly not what we like to hear, MB2021SIERRA.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2021 GMC Sierra. To do so, please send an email to [email protected] with ATTN: MB2021SIERRA/GM Trucks in the subject line.

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