Is the GPR and the GPCM the same thing

FaQue · #1 (**permalink**) 01-12-2008, 10:18 AM

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.

redpony69 · #2 (**permalink**) 01-12-2008, 01:45 PM

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?

99bigred · #3 (**permalink**) 01-12-2008, 07:17 PM

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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