I have 2005 monte ls with 137000km,the abs and traction control lights come on when its wet or damp,I believe it's the wiring harness,could it be?

 

Speed sensor (hub)? They are notorious for going bad....

 

could be,i am hoping its just the wiring harness,thanks

 

check all the wiring for each hub first. then check for ground wires near the abs pump and in front of the engine. this is where i had my problems. if everything is clean, good, intact..then look into replacing hubs. ive had to replace mine 2x in the past 5 years

 

As said prior the wires go brittle over time and will break, they are not very well protected under the hood and they should be. Also sometimes the Wheel speed sensor comes loose or gets a bunch of gunk built up, pulling it out and giving it a good cleaning may solve your problem. Best and easiest way is to replace the wheel bearing, purchase the Timken bearing if you decide to go this route as they seem to last the longest.

But definitely check the wiring first as you say it only happens when it rains or goes through water it could just be a frayed wire or loose connection

 

thanks guys

 

how is the right front abs sensor harness routed,can't seem to find it in my 2005 gm service manual,in other words,what do i have to remove to get at it???

 

Here is a link to a how to change the wheel hub assembly guide written up by one of the mods. It should hopefully answer your question

https://montecarloforum.com/forum/fw...ssembly-33657/

 

And here is a link to to how to change the front and rear wheel speed sensor's

https://montecarloforum.com/forum/fw...lacement-1874/

 

Thanks Ken,I just didn't know how to tie in the wiring harness pigtail or where to??,first time working on abs,traction control system or a monte carlo for that matter.