Fuel gauge started to drop from 12 to 2.5. Pulled over and checked codes
1693
1682
0622
0743
0500
1765

Where can I find out what they mean?

 

In our section.
Just look in the page header.
http://wiki.dieseltruckresource.com/wiki/Computer_codes

 

http://wiki.dieseltruckresource.com/wiki/Computer_codes

its in the wiki section of the website

1693 (not on the list, did you mean 1639?) 1639- P1639 Vehicle ID Block Corrupted, Not Programmed
1682- not on the list, sorry
0622- P0622 Generator Field Not Switching Properly
0743- not on the list, sorry
0500- P0500 Vehicle Speed Sensor A
1765- (not on the list, did you mean 1756?) P1756 Governor Pressure Not Equal To Target @ 35-40psi

Hope that helps, good luck!


Josh

 

I also go to a OBDII site to find the ones that aren't normally listed.
http://www.obd-codes.com

P1693 DTC Detected In ECM Or PCM
P1682 Charging System Voltage Too Low
P0622 Generator Field Not Switching Properly
P0743 (M) Torque Converter Clutch Solenoid/Trans Relay Circuits
P0500 - Vehicle Speed Sensor Malfunction
P1765 Trans 12 Volt Supply Relay Control Circuit

Check your batteries and battery connections.

 

Battery connections and grounds were my first thought. Those are a bunch of electrical codes that point to different things, so poor grounding could be the cause. Clean all of the grounds first.

 

No guys I just ran it out of FUEL! Guess the gauge is not working poperly any more because I used to run it down untill it would ding but now it ran out of fuel with a litttle less than a 1/4 on the gauge.

 

After I put some diesel in it and disconected the negative cabels all the codes were gone except the 1693. Thanks for yalls help.

 

A friend of mine did that the other day, and I think I may have when my truck just quit. Kind of makes you feel like a dummy. Glad you got it figured out, though!