Malfunction indicator light on dash lighted, I did the trick with key, on-off, on-off, on code P0456 came up. I followed older threads and found I should check gas cap and rubber hoses under hood. I see nothing obvious so I thought I should check again to make sure I read code right and can not get any code to to come up. I do get total hours (2174) I can run gauge sweep. What am I doing wrong? Thanks for any help. 05 SLT 4X4 4.7 V8 53500 Miles

 

can you take it to an autozone or something and have the code actually read?

 

I can no longer to get the display to show a code or ---done--- I didnt know if by reading the code once while I was turning key on and off if I put it into a different mode. I know cycling the key can change the door lock functions, read a code, and sweep the instrument cluster. I'm not aware of anything else that the key does besides starting the engine. The manual does not cover all the little tricks so I wanted to check to make sure I didn't mess something up by playing with the key. I will swing by Advance auto and have them check to make sure I read the code correctly, get it cleared and see if it comes back. Thanks for the input.

 

how do we check dtc's on our dak's with the odo?...i thought this was a deisel truck/obd1 jumper wire thing

 

there's some key on-off sequence you can do to get the codes to show up on the odo. I'm not sure how it's done. I have a code reader so never had the need.

 

I had read in one of the older posts that some Daks would support this by turning key on-off-on-off-on all within 5 seconds, a later post said to hold odometer reset button down for a minute or so and hour meter would display total hours run. That also worked for me. A friend has a code reader and I checked with that and got the same P0456 code, I cleared the code and it hasn't come back.