Is the GPR and the GPCM the same thing - Ford Powerstroke Diesel Forum
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Old 01-12-2008, 11:18 AM
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Is the GPR and the GPCM the same thing

Trying to check my glow plug system and come across terms I am not sure of so I have to ask Is the GPR and the GPCM the same thing. I have checked and changed my GPR but still don't have glow plugs working. Glow plugs check OK.
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Old 01-12-2008, 02:45 PM
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The gpr is just a basic relay for the glow plugs. A gpcm is a module that does the same thing but is meant more for California emissions. A gpcm will be a silver box with a green and a black connector on it. Also make sure that the gpr is being controlled by the pcm. Are there any codes?
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Old 01-12-2008, 08:17 PM
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dont mean to hijack this thread but i have an early 99 in california and i changed the GPR, is there something else on there since it is a california truck?
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