Engine/Transmission (1998.5 - 2002) OD light on

[MA2LA]

A good friend has a 01 2500 and whenit is cold out the od light comes on when he starts it and it it has set long enough to get cold. When its warm out it doesn't do it. Is this some type of protection built in to the programing? It doesn't ack wierd except for no od until it warms up.

 

[JLandry]

Have him check for Diagnostic Trouble Codes. If any have been set, this could offer a clue as to where to start looking.



In his 2001, he can turn the ignition key as follows and watch the odometer window for a "P" code: RUN-OFF-RUN-OFF-RUN.



More questions:



Has it always done this since he's had the truck, or did it just start?



Assuming it started happening at some point, did he make any repairs prior to the start?



How cold, and how warm, does it have to be when it does this or doesn't do it?



Has he ever had the PCM (Powertrain Control Module) replaced or reflashed?



Let us know what he finds out on the trouble codes.



Best regards,



John L.