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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29523
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 08 sierra and my factory brake controller only

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I have a 08 sierra and my factory brake controller only works when I do it manually with the controller. I have nothing with the brake pedal. Any ideas?

Hi there, I am CAm.

First off, do your brake lights work? This range of truck are notorious for a brake switch issue, and with the brake switch not working, your factory brake controller would not know your on the brakes.
Can you check and see if this is the case? The switch is a very simple repair, takes about 10 mins and the switch is about 30$.

Customer: replied 2 months ago.
trailer lights also work fine

OK, are there any codes stored in the system?

Customer: replied 2 months ago.
I will check today and get back to you.

Perfect. That will help get down to the root of your truck's issue.

Customer: replied 2 months ago.
I assume codes would be in the body module?

No, in the trailer brake control module.
THe common issue I have seen are the module, the relay and the brake switch.

The code will start with a C.

Customer: replied 2 months ago.
I do have 2 codes 1st one is c0845 and other is c1114.

Sounds like a wiring or module issue. See and follow the info attached.

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