P0500 code, replaced sensors, still nothing

Vehicle info: 2005 Tacoma SR5 Pre runner V6

Recently repaired rear diff and now getting P0500. Speedometer not working as well as ODO. Also before repair, my Cruise control went out. I’ve read all the posts on here. Checked all wires. Replaced the transmission speed sensor. Checked all fuses. Still nothing. Please help!

 

Also, Other gages work fine.

 

When my speed sensor went out, I to replaced my speed sensor & my speedometer didn’t work. I pulled it back out & looked at the nylon speedometer gear. I noticed very fine hair like shaving on the speedo gear & subtle flat spots on it. I went to the dealer & ordered a new speedo gear. Came in the next day, I installed the new gear & all works fine. The nylon speedo gear is driven by a metal gear inside the transmission. When the speed sensor fails, the nylon speedo gear stops spinning & that causes the fine shavings & flat spots.

 

I'm researching this right now as well. I have P0500, but my speedo is working fine.

 

Truck is also Automatic, does that change anything?

 

How do I look at the nylon gear in automatic?

 

Mine is a manual transmission, gear is on the end of the speed sensor. Not sure on automatic

 

Yeah that’s my problem. Everyone has a thread in manuals, pretty easy to locate but have no idea on automatic.

 

@gearcruncher I’m sure he knows where it is.

 

From what I can tell researching online, P0500 is related to the speed measurement from the abs wheel speed sensors for auto trannies.

There’s a YouTube video where a guy shows the computer screen as he’s looking at the service manual diagnostic info

 

Check charging system. Then check fuses

 

Alternator is fairly new and fine. Battery new. Fuses all good.

Did a live scan with OBDII. Shows no mph. So it’s not the cluster.

 

All abs wheel sensors seem to be okay

 

I meant check the voltage with engine off vs running

 

Voltage good.

 

Then it looks like your cluster is going bad

 

Voted cluster out because we used our OBII tool and love data showed no mph. And that’s becrore the cluster. My father in law knows a Toyota tech and will be talking to him this week. I’ll post what happens next

 

Skid control ECU or main ECU would be next suspects. In that order

 

Any thoughts on where to look first in my case? I have P0500, but my speedometer IS working normally. I have an auto tranny.

 

Replace 2 sensors on tranny.