99 7.3L Throwing Codes, How Bad is it? - Ford Powerstroke Diesel Forum
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Old 04-12-2012, 12:09 PM
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99 7.3L Throwing Codes, How Bad is it?

Hey Guys,

I just took our 99 7.3L Work Truck with 120k miles in for a regular service and inspection. It had a check engine light on so they ran a diagnostic and it pulled the following codes;

P1391
P1393
P1396

How screwed am? I don't really want to take it in to ford to fix if at all possible I would like to do the work myself but I don't know how to further diagnose the codes.

Any help would be great, thanks guys.

John
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Old 04-12-2012, 02:30 PM
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All Glow Plug related, shouldn't be too serious, go through the steps in this link and you'll know more....

Troubleshooting GPR & GP's

Your codes come back in this range;

P1391-GP Circuit Low Input Bank No. 1 (RH)

P1392-GP Circuit High Input Bank No. 1 (RH)

P1393-GP Circuit Low Input Bank No. 2 (LH)

P1394-GP Circuit High Input Bank No. 2 (LH)

P1395-GP Monitor Fault Bank No. 1

P1396-GP Monitor Fault No. 2
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Old 04-12-2012, 02:40 PM
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If this is a California Truck, it probably has a GPM (Glow Plug Module), not just a relay. Mine is and mine does. I had to replace it in September '10.



I got mine through RockAuto.com. Obviously, there are other places to get one.
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Old 04-12-2012, 02:46 PM
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Well that doesn't sound all too bad, where is it located in the engine compartment?

Thanks,

John
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Old 04-12-2012, 03:37 PM
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Mine is on the valley side of the passenger side valve cover, if I remember right, it's closer to the front of the engine.
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