• Hey guys so i think i narrowed down the surging to one thing. P0500 obd code. I replaced the speed sensor in the tranny and it worked for a little while. Im still dealing with this issue. I ohmed the two wires to the pcm connector and they are good. My boss suggested a short to ground. I know its a wire issue now because i went over a bump and the abs/brake light came on again. What are some grounds and other things i can check? Battery terminals are new and clean. Anybody else have a problem like this? I have a p1693 code that follows after the p0500 is thrown too. Assuming that its because of the vehicle speed sensor circuit 1.

 

 

P0500 is a rear speed sensor code. The sensor is in the rear differential on top. 

 

Now are you seeing any issues with your speedometer at all if not then it might be a front sensor that is failing. It's typically best to replace all speed sensor as a set. This that doesn't help it could be a failed tone ring been there... 

Where are my front speed sensors located? I replaced the rear speed sensor already. 

 

In the wheel bearings. The sensor kind of follows the brake IIRC. They are pretty obvious if you look over the back of the tire.

what year truck?

My '99 dont have no stinking  front speed sensors or front ABS junk 

 

 

.

 

.

3 hours ago, DTech22 said:

Where are my front speed sensors located? I replaced the rear speed sensor already. 

 

On my 02 they're behind rotors, I have brake/ABS light come and go so I changed my sensors and it didn't help. I think my problem is from over greasing my wheel bearings on front, every time I get tone ring cleaned from grease light stays away for awhile. 

My truck is an 02, found them behind the rotors. My speedo does vary slightly going down the road too. My abs and brake come and go too. Last time was when i crossed railroad tracks.