My speedo quit working last week. Odometer and cruise control. also the ABS, CEL, and Brake light (on instrument cluster) came on.

I have a 2007 2500, 5.9 stock. Automatic Transmission 4wd.

I have replaced rear differential speed sensor, Transmission speed sensor and have checked all fuses for corosion and failure.

Problem continues and the error codes are P0500, U0121, and P2059

I am stumped on this one. any help at all will be a big plus!!!

 

first off is this gas or diesel?

I am assuming it is diesel due to the P2059 code...

It sounds like you have a problem with the speed sensor and ABS sensor(s).

You might want to bring it in to the dealer and see if they might be able to tell you which sensors are not working so it will save you some time and money, so you don't have to replace "all" of them.

As for the P2059, I'm stumped on that one but Google Search might return some info on it.

 

Mike and Izero, as far as my reader definitions go P2059: Reductant Injection Air pump control circuit(open). Not to sure what this pertains to since I'm not too familiar with diesels. hope this helps

 

It turned out that the ABS control module had a bad pin (corroded) I replaced and all was good. took a while to track it down.

 

Can somebody explain the technique to unplugging the harness from the module? I pushed what I thought was a depress tab and wiggled the connector but no luck. Obviously do not want to break this connector.

Thanks