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Gmc: good afternoon. I have a 2002 2500hd 4x4 6.6l codes are:

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good afternoon. I have...
good afternoon. I have a 2002 2500hd 4x4 6.6l codes are: p0380,p0540,p0090,u1800,u1000. wont start cold unless you use start fluid. when it does start it runs sluggish. After it is in service for a while its fine, until you shut it of for a while then it wont start. Any suggestions?
Submitted: 2 years ago.Category: GMC
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Answered in 19 minutes by:
4/29/2015
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29,591
Experience: GM Grand Master Technician 2007. 14 year experience.
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Hello, I'm Cam.
Can I get your first name please?
Sorry to hear about this. Let's see what we can do.
To start, do you have a test light?
If so let's test power into the glow plug controller. This is on the valve cover behind the turbo pipe. The front most cable/stud is the power into it. Does that have power all the time?
When you turn the key on/ do you feel any clicking inside that assembly?
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Customer reply replied 2 years ago
David. Yes. Not at work right now. Had to leave shop. I can perform this test in the am. what should I do next if we have power and then if we don't?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
No power means the mega fuse under the fuse block is bad.
power means possibly the issue is inside the glow plug controller. Basically its 2 relays under there. The power splits off under the cover from that stud and heads to 2 relays. I have seen many where the terminals under there are bad. I would take it apart and have a look if I was you after confirming no power.
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Customer reply replied 2 years ago
Thank you. Does this cover the p0380 code? Should we be concerned about the other codes based on the symptoms?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Yes, lets see what that does for power and go from there.
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Customer reply replied 2 years ago
Ok, thank you. What time slot are you on-line, just in case?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
I get up around 6 and log on. Then my computer is on my tool box throughout the day so I am around almost all day.
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Customer reply replied 2 years ago
I can't seem to remember what the voltage should be for the GP controller, and can't find my book
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
its battery voltage.
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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
This has california emissions. So that means that the module in the back is likely bad and needs to be replaced. Do you have the Vin handy?
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Customer reply replied 2 years ago
Yes I do, it is as follows:1GTHK23142F124396
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
i think you may have multiple issues going on here. AT the controller there, do you get power with the key on in the small pink wire?
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Customer reply replied 2 years ago
Yes there is, I rechecked the stud, the nut holding the stud, and the lead of the wire connected to the Stud. I am checking in the right place correct? Or is it elsewhere
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
This is the small control wire in not the main power in, its in one of the smaller connectors.
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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
What colour is the wire? How thick?
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Customer reply replied 2 years ago
It's in a grey/silver mesh sleeve
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
that is supposed to have power and it comes off the stud we tested at the glow plug controller.
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Customer reply replied 2 years ago
It's a black wire, found the actual wire in a plastic cover near where it was connected in that picture
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Reconnect it and see what happens. I think that will correct your P0540.
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Customer reply replied 2 years ago
Reconnected the wire, cleared the codes, turned the key back on. Scanned for codes, in the failed this ignition section it only shows the P0380 one still.
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Glow plug module!! Great work so far.
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Customer reply replied 2 years ago
Ok, so that means the module is bad and needs replaced?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
YEs, that is correct.
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Customer reply replied 2 years ago
Ok, would that solve the crank but no start while the engine is cold?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Yes, right now the glow plugs are not working nor was the intake heater. Add the glow plugs and she should work like new.
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Customer reply replied 2 years ago
Would I replace the glow plugs even though they were replaced not too long ago
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Glow p[lug module. Not glow plugs.
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Customer reply replied 2 years ago
Ok, sounds good
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Is there more that I can get you today?
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Customer reply replied 2 years ago
How do I get to and check the cam and crank sensors
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Are they setting codes? They are best accessed by taking out the passengers front wheel well and reaching in through.
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Customer reply replied 2 years ago
They aren't throwing codes, but it's reading misses on scanner
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Sorry the reply did not show through. What are the balancing rates on your engine?
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Customer reply replied 2 years ago
What should the resistance be for the camshaft position sensor, got it out and it doesn't look damaged. Which pins do I check? It's a 3 pin
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
ITs not a sensor we simply check resistance on. Its a solid state device and a hall effect sesnor. One pin has power, one has ground and the third is a signal wire.
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Customer reply replied 2 years ago
I've ne checked Hall effect before how do I do that? And did you have a good weekend?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Weekend was ok. not long enough. To check that sensor you verify wiring and replace. Its not one that you can check using a meter.,
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Customer reply replied 2 years ago
Ahh ok
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Remind me why we are checking the cam and crank sensors again?
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Customer reply replied 2 years ago
Boss thinks that is what's causing the problem, and can't argue with him. Just gotta do it lol
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
YUp. Did you replace the glow plug module?
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Customer reply replied 2 years ago
Was told not to mess with it as it was just changed
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, I think we need to deal with that.
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Customer reply replied 2 years ago
Ok, I'll let him know and will get back to you as soon as I get an answer. Tho he can be pretty stubborn at times
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
LOL, I won't comment.
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Customer reply replied 2 years ago
Lol it's all good
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Is there more I can get you?
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Customer reply replied 2 years ago
I remember you asked earlier as to what the Balancing rates were for the engine, is that the same thing as cylinder contribution? If so our scanner doesn't give us that information
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
I Am not sure what others call it. This tells me how much fuel each cylinder is adding to keep it idling smooth.
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Customer reply replied 2 years ago
I don't see that info on there
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, IT would range from -4 to +4 normally.
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Customer reply replied 2 years ago
Thank you, ***** ***** back to you in a bit
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Sure thing. How am I doing so far? We have been working through this for a bit. I like to know if I am on track as far as ratings go.
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Customer reply replied 2 years ago
Doing great so far, looks like my boss is gonna get the glow plug control module. If after replacing that it still doesn't start, what should I check?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
After that we follow the codes. right now it starts hard when cold, I am 99% sure the module will fix it. Just wanted to mention that the rating you provide is how I get paid. No rating means I don't get paid.
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Customer reply replied 2 years ago
It's a crank no start
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
ok, did we check return rates yet?
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Customer reply replied 2 years ago
No
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Find the 2 fuel lines on the rear drivers side valve cover. Take the smaller one off and attach your hose to the metal pipe coming from the engine. Put the other end into the container and run the engine to fill that line. Then shut it off and remove the IGN 1 relay from beside the starter relay. If the engine will not start at that time, crank it ti fill the line, then empty out the container and keep the line full. Crank the engine for 15 seconds fully and measure the amount of fuel that comes out of that line. More than 24cc means the injectors have failed.
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Customer reply replied 2 years ago
And this can be done even if it will not start at first?
Customer reply replied 2 years ago
* should say at all
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Yes, I really need to edit that post. You can crank it to get the fuel lines full.
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Customer reply replied 2 years ago
When looking at the scanner, in the fuel data display, with ignition clicked to on(not start), it says: fuel rate(mm3).....-1
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
What does that say when you do get that running?
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Customer reply replied 2 years ago
Can't get the truck running to check
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Ok, do the return test when its not starting and lets see where this goes.
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Customer reply replied 2 years ago
Ok, I'll have to reconnect the cam position sensor, so might have to get back to you tomorrow for that
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, sounds good.
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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, sounds good.
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Customer reply replied 2 years ago
If I remember right this is a free week trial right, I want to make sure that there is plenty of time left on it. Does it show how much time is left?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
In this thread, the timer has been removed so its not relevant.
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Customer reply replied 2 years ago
Hey sorry for the long wait in getting back to you, been side tracked on a few emergency jobs at the shop. Starting to get it out back together to do the return rate test
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
No problem. I am not online full time this weekend anyway. I will try to reply as quick as I can.
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Customer reply replied 2 years ago
No worries, gonna begin the return rate test now. What should I be ge as a reading
Customer reply replied 2 years ago
The fuel lines that I check are the ones right in front of the glow plug control module correct?
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
Yes to the location of the lines and we want to see low numbers. Over 24cc total is bad.
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Customer reply replied 2 years ago
There has also been a lift pump installed on it, and I know it's gett fuel to the filter and we haven't lost any prime. How do I check if the fuel is getting to the fuel rail? Can't really do the return rate test because the truck will not start. It's still a crank no start
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
The return rate test only requires crankibg. I would ask to run the engine to fill the line so we get an accurate measurement so just crank till the line is full then start the test.
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Customer reply replied 2 years ago
Will give that a shot
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, sounds good.
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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, sounds good.
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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, sounds good.
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GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
OK, sounds good.
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Customer reply replied 2 years ago
So we its disconnect the feed line for the fuel and put it back on. Went to start it after a bit. Started right up, ran cherry for a bit and shut it off. Went to start it again and started right up. Then it started dropping fuel pressure and died. Primed it up a bit, ( tho primer was still a bit soft,) and it started up, but died again due to dropping fuel pressure.
Customer reply replied 2 years ago
The feed line was the one coming from the filter
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
I dont suppose you have the means to check the vacuum on the system at the vacuum port?
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Customer reply replied 2 years ago
Possibly, tho can't say for sure. Could it be a faulty fuel pressure relief valve?
Customer reply replied 2 years ago
No I do not have the ability to check the vacuum
GMC Mechanic: Gm Tech (Cam), GMC Mechanic replied 2 years ago
It's not likely the relief valve or it would not run if you kept pumping the plunger.
Is there a way you can borrow a vacuum gauge and attach it to the hose into the bottom of that test port and measure the vacuum with it cranking.
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Customer reply replied 2 years ago
Will find out
Customer reply replied 2 years ago
I do have a vacuum gauge available, how do we test it with the gauge? And how do I test the regulator?
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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
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