I need help please on abs- **SOLVED**

[Lit549]

Aight, i had this problem several months ago when it rained, now its back and even worse.
2005 tahoe, one day "service brake system" message came on and simultaneously the abs/brake lights illuminated, with warning chime and speedo goes haywire. It also wouldnt shift, i pulled over fir around 30 min and it made it home, i checked the grounds as recommended and it was fine, till yesterday. Its back and it will not shift out of 2nd, i replaced the speed sensor and looked over the abs module with no luck. Grounds are good, front speed sensors show signal when wheels turn, no chaffed wired, nothing i can see that is wrong. Any ideas?? Oh, and now the engine light came on after driving 50mi in 2nd!! Im lost, and very frustrated. Thanks for any advice

 

[PNWYukon]

Can you check for codes?

 

[Rocket Man]

Have you checked for codes? That's the first thing you need to do. If you can’t troubleshoot that way then it might be time to get a bidirectional scanner like a Tech2 so you can check the individual components like speed sensors etc. They can be had for $300-350 but it might take a week for shipping from China unless you can find an eBay seller with stock in the US.

 

[corvette744]

Maybe try autozone they will pull your code for free-if its a simple abs speed sensor code at least you will no which one it is.Maybe just replace it cheap around 20 bucks.

 

[Lit549]

Yea i currently dont have a way to pull the codes, i will have a snap on scanner loaned to me in a week or so but i need my truck now.
I changes the speed sensor and nope still does it. I changed both hubs 2 yrs ago, and i dont think the rear has speed sensors? I was just hoping some has had this issue cause i see alot on a google search but the fixes are all over the place..

 

[Lit549]

Maybe try autozone they will pull your code for free-if its a simple abs speed sensor code at least you will no which one it is.Maybe just replace it cheap around 20 bucks.

Yep, already replaced it and its the same.

 

[Rocket Man]

Yea i currently dont have a way to pull the codes, i will have a snap on scanner loaned to me in a week or so but i need my truck now.
I changes the speed sensor and nope still does it. I changed both hubs 2 yrs ago, and i dont think the rear has speed sensors? I was just hoping some has had this issue cause i see alot on a google search but the fixes are all over the place..

Yes the rear absolutely does have wheel speed sensors. What brand hubs did you use 2 years ago? If they’re not OEM or Timken one of the sensors in those might have gone bad in that time. Either get a cheap $20 code reader or go to any auto parts store and have them pull codes. Take a picture with your phone so you’ll remember what they are. It won’t tell you which one but it should point to the front or rear. That’s if this a speed sensor issue. There might be other codes. But if I sensor is bad it will cause these issues.

 

[Lit549]

I actually have a code reader but ny son has it 4 hrs away, lol. I used either the moog or timken i cant remember. The rain has something to do with it as i drove in heavy rain for 3 hrs the other day. It sat for 6 days then back home another 3hrs in heavy rain, after that its totally fubar!

 

[Lit549]

Im not seeing a rear abs sensor at all.

 

[exp500]

https://www.rockauto.com/en/moreinfo.php?pk=1416248&cc=1431156