I started my truck tonight to run to the store and it started fine but I had no gauges. I looked at my odometer and it was flashing (no buss). Then my check engine light and antilock light came on. I shut it down and tried again with the same results. I checked codes and have 1694,1693,1687. The 1687 is the one that has me lost. It was about 40 degrees out and I did wait for the heater grid to cycle which I don't have to do here in Florida to often. I went ahead and drove to the store and back. Shut it down and started it again and now the gauges are fine but still have check engine light and codes. Anyone have any idea what the 1687 means?Thanks guys.

 

There is a list of codes here on the site

 

Steve, you ever get this figured out? I have the EXACT same issue.

 

mine did something very similar there is aconnector under the cover for the underhood fuse panel when imine acted up i went through with dielectric grease and coated every connector i could unhook and when i got to the one in the fuse box it all came back just be careful tightening it as it will twist free easily just needs to be snug. hope this helps