glow plug circuit malfunction
 

My 03 Dmax threw a code that said glow plug circuit malfunction. Are there any fuses or relays that I could check?

what code is it?

P0380

ok, is your truck a cali or federal emmision truck?

I've been told it's a cali....it doesn't have the rail over the glow plugs...u can see the nut & wire on top of the GP.

ok, you have a problem with a glow plug then. u can use a ohm meter and check the resistance of the glow plug from the top of the glow plug stud to ground. should be around 1ohm.

you can also use a test light and connect it to the positive battery terminal and touch the stud on top of each glow plug and see if it lights up, if it does its good.

Do I need to disconnect the wires from the plus before testing

no

Test light lights up on each plug ...so plugs are good ..What do I check next?

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I was wondering if there's a way to test the GP controller.

try using an ohm meter