I started my truck the other night when it was 9 degrees, and the check eng symbol came on. I shut it down and did the 3 key turn thing and it stayed dashed lined then said done, no code. But CEL is still on. Any ideas? I did have a cel last spring that was throwing a code for something like computer not sencing voltage drop from grid heaters, but that went away. and this time and last time my heaters worked, I am at a loss. Any ideas. I dont have a scanner.

 

Have you tried doing the gauge check by holding down the odometer reset button and turning the key on? It may be stored in the C codes.

Here are the links to do that...

https://www.dieseltruckresource.com/...d.php?t=224833

And the codes...

http://wiki.dieseltruckresource.com/..._codes_C_Codes

 

No. I will, thanks