Hi guys, hope you can help. I have the 2002 5.9l dodge ram 1500 gas truck and am getting a check engine light coming up but only on very cold days, below -10. The thing is it is giving me the fault code of p0300 but the truck runs fine, there is no evidence of mis-firing at all. As soon as the weather warms up the light goes out and stays out until it gets cold again. Just wondering if you guys have had this problem before and can shed some light on what it could be....

Ps: have changed the plugs, leads, and distributor cap already

Regards....

 

hows it going! I have been looking for what happened to the power to my car stereo and door locks and found what the codes mean at www.freeautorepairmanualz.com. Turns out that it means P0300 Random/Multiple Cylinder Misfire Detected. If you may know what is going wrong with the power to my door locking power and stereo. I would appreciate it. Thanks

 

I'd do a search for simular problems if you can't fin anything start your own thread lot of stuff to learn here whether you want to or not. These guys are very bright. Sorry I can't help and welcome to DF!

 

to the OP how long has it been since your last tune up? maybe check the plugs clean them or replace.

 

I had a SEL on back in Dec, and it was the engine running TOO cool! I run a 180 t-stat, so that was part of my prob, on cold days the temp is too low for the ecu

 

i run the 180* t-stat, its been 5* here and no problems.
what plug are u running?
in the 5.9L you should have copper core plugs, 8 - 8.5 mm plug wires and the dist cap and rotor should have brass contacts.

make sure you have your plugs gapped at .040. you might also try getting higher octane fuel.

if nothing else, it could be your pickup coil that sits underneath the rotor in the distributor. ive been through this with 3 magnum motors. 2- 5.9L's and a 5.2L

 

I agree nim, we have not gotten above freezing for two weeks and it has been fine since that one time, all I did was reset it and has not come back!

 

well SNKMRAM, in my many years experience with the 5.9L if the CEL came on with a misfire code, it will be back!

 

mine was not a misfire code, I was told it was a code for running to cold?

 

oh, thats odd.