Speedo is not working

[stariy]

My speedo stop working, and engine RPM, jumping 400-500 up while driving on freway or street

Heed help

 

[SYTECH]

Check the wiring going to your DRAC. Maybe the connection is not tight

The DRAC (white plastic box) is mounted to the outside of your ECM

One of the wires controls the speedo

Good luck

 

[stariy]

Checked every plus, tied them with tiewraps, Still doing same thing.

Any more ideas?

TIA

 

[SYTECH]

I had my wife drive while I wiggled the wiring harness connector

(Of course the ECM was removed / hanging on the floor for easy access)

I had a bad pin on the DRAC itself. If I held my breath, wiggled my ass, and turned to the left ....just right..... the speedo would come back on

I ended up soldering a jumper from the DRAC pin directly to the wire going to the speedo and the speedo started working again

Good luck