Hey everyone
My dad has a 2005 Gmc 1500. He recently had some O2 sensors problems but we have that all fixed. but the problem is now Everytime i hook up the scanner he has a few Abs codes pop up but the abs light has never come on. Codes are C0035 C0040 and C0201. i've tried clearing them but they come right back, and seems to be no issues with braking.
I've done a few searches and things seem to point to the EBCM?? Just maybe wanted some other input. kinda thought it was weird having these codes but no abs light
Thanks

 

C0035 & C0040 is the Left and Right side front wheel speed sensors.

C0201 is supposed to be "ABS Enable Relay Contact Circuit"

GM has a TSB #04-05-25-002D related to the C0201.

It states to clean the ground on the frame and use a new nut bolt and washer to attach it.

You should also check the main plug for moisture or corrosion and repair as needed. Then use Dielectric grease to protect the connection.

If your scanner has bi directional controls, you should activate the light on the dash to verify it is working properly.