When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Recently changed all my glow plugs to the new ZD30. Purchased them from OReilly auto parts. I still have the same codes before install
Didn’t installed a new harness bc I thought the one on the truck was still in good shape
Today I tried turning on the truck in Atlanta weather and it struggled to turn on. Took me about 3 tries to turn on. Mind you last time I drove it was on Sunday morning.
Do these codes mean the glow plugs I got are bad or is the valve cover harness bad?
Recently changed all my glow plugs to the new ZD30. Purchased them from OReilly auto parts. I still have the same codes before install
Didn’t installed a new harness bc I thought the one on the truck was still in good shape
Today I tried turning on the truck in Atlanta weather and it struggled to turn on. Took me about 3 tries to turn on. Mind you last time I drove it was on Sunday morning.
Do these codes mean the glow plugs I got are bad or is the valve cover harness bad?
I can't tell in the video if you are just cranking as soon as you put the key in or letting the Glow plugs do their job.
You could possibly have an issue with the UVCH's and/ or glow plug relay. there are steps to check those with a multimeter but I do not have them memorized.
being one whole side is showing bad and a single on the other side... I would check the relay and the UVCH's.
You can test the glow plugs with only removing the connector to the UVCH.
I can't tell in the video if you are just cranking as soon as you put the key in or letting the Glow plugs do their job.
You could possibly have an issue with the UVCH's and/ or glow plug relay. there are steps to check those with a multimeter but I do not have them memorized.
being one whole side is showing bad and a single on the other side... I would check the relay and the UVCH's.
You can test the glow plugs with only removing the connector to the UVCH.
did you clear the codes after doing the GP's?
I did cycle the glow plugs twice, both 40 seconds after wait to start light before attempting to turn on truck
I do have an excursion so I have the control module. Is there a way to test that before I go digging under the valve cover?
I think there might be a way to test the GPCM but I am not familiar. Typically it would show a specific code if it was faulty but that may also not always be true.
I'm not saying you need to open the valve covers again. you can test the glow plugs/ wiring by just unplugging the connector to the valve cover gasket and using a multimeter.
You would be ohming out the glow plugs and verifying that the connection is good. If you can't get a reading, then it would indicate an issue with the UVCH or possibly the connection to the glowplug didn't get fully seated.
I'll have to see if i can find the instructions or video to show you what i'm talking about
Okay, do not pay attention to the fact that these are superduty's with relay. these videos will just show you how to test the glow plugs/ wiring. these are just the first ones I found; there are better videos out there but should give you the idea of how to do it.
I should also note that it's not typical there are issues with an entire bank, make sure the connectors are fully seated on your glowplug control module. If you get continuity to your glowplugs, then most likely it's the GPCM or wiring.
first one if you have a test light; I've never used this method but will let you know that your UVCH wiring is good to the glowplugs
