Thread: What level to run
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Old Tue, January 27th, 2009, 10:25 PM
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In regards to the programming in cold weather, what we are directly referring to is the actual temperature of the PCM, not the ambient temperature.

As long as the engine has reached operating temperature (ie. engine is warm, battery is warm, PCM is warm) then reprogramming is fine. What you do NOT want to do is jump out at 7:00 am after the truck has been sitting all night at 5º F and try to program your truck as there is a good possibility of a programming failure. Of course, once the PCM is pooped you don't have any way to really warm it up until spring rolls around. That, or a hair dryer! :hairdry:

Take care.
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