SOURCE: I have the viper remote start in my 2010 f250 and
Common complaint - the aftermarket equipment is interfering with the factory equipment. ALL of the vehicle manufacturers have published Technical Service Bulletins warning their techs about these problems. The aftermarket equipment can cause everything from no-crank/no-start to misfire and transmission shifting problems. Not only do the aftermarket systems themselves have problems, but they usually also cause serious damage to the factory equipment, especially wiring harnesses due to shoddy installation and "butchering" of the harnesses.
Here is a "snapshot" of one of these manufacturer publications:
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