How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
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.
Type Your Chevy Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

I have a 08 sierra and my factory brake controller only

This answer was rated:

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.

GM Tech (Cam) and other Chevy Specialists are ready to help you