C0045-5A code issues - Wheel Speed Sensor

chuck804

New Member
First time poster here. I'm in need of some help in addressing a C0045-5A code (Left Rear Wheel Speed Sensor Circuit - Not Plausible) on my 2008 Avalanche LS that will not go away. Below is what I have done with no success. No other codes are triggered. The ABS and traction control lights on the dash are illuminated, along with the messages on the display that the traction control and stabilitrac are off.

1. Replaced the speed sensor twice, cleaning up the grime around the hole and erased the C0045 code. Result: C0045 code pops up once the vehicle goes into drive.

2. Replaced the speed sensor connector: Result: C0045 pops up again after erasing code.

3. Removed EBCM to check for damage and temporarily replaced with a working EBCM with no ABS codes from another 2008 Avalanche to test. Result: C0045 pops up again after erasing code.

I traced the wiring from the speed sensor connector to the EBCM and did not see any noticeable breaks. Would it make sense to bypass the current wiring with new wire, tapping into the sensor wires at the EBCM? Thoughts?

Thx!
Charlie
 

newavguy

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No the manual did not say. I would just try moving the axle by hand and see how much up and down play it has. See if it's leaking that's a dead giveaway the bearing is bad. I'll check again tomorrow for more info.
 

Capt.Crunch

Full Member
No the manual did not say. I would just try moving the axle by hand and see how much up and down play it has. See if it's leaking that's a dead giveaway the bearing is bad. I'll check again tomorrow for more info.
Great, I'll look in my manuals tomorrow and see if I can get a little more information about it, I'll let you know what I can find about that particular code.
 

Capt.Crunch

Full Member
Great, I'll look in my manuals tomorrow and see if I can get a little more information about it, I'll let you know what I can find about that particular code.
Oh, ok, I thought you were just assuming that the axle was moving up and down. But yeah, that would be the problem. Lol
 
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