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Old 03-31-2006, 11:22 AM   #41 (permalink)
carhauler
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I just saw one torn down , the head was on the bench with 2 GP out , I looked at the head/piston and cylinder as well as I could and saw no damage , it was a Brand new truck still had the stickers on it so I don't know the miles and the salesman did not either ,it was sooty on the piston and valves and no marks or anything in the soot so where ever the tips went it was not too ugly on that one, They were updating my new one as I was seeing this one , I sure hope the update is the end of this problem!
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Old 03-31-2006, 03:20 PM   #42 (permalink)
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NEW BULLETIN ! as of 03/28/06

Document ID# 1802153
2006 Chevrolet Chevy K Silverado - 4WD

Subject:Diesel Engine Glow Plug Trouble Codes - keywords calibration circuit glowplug GPCM hard indicator LBZ LLY module multiple P064C P0671 P0672 P0673 P0674 P0675 P0676 P0677 P0678 program programming SES #PIP3586C - (03/28/2006)


Models:2006 Chevrolet Express, Kodiak, Silverado
2006 GMC Savanna, Sierra, TopKick
Equipped with the 6.6 (RPO - LBZ or LLY) Duramax Diesel Engine


The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1802153&psdid=1233&evc=sm#ss1-1802153">Condition/Concern:

A vehicle may be brought into the dealer with the SES light on and multiple cylinder glow plug DTCs set. Multiple glow plug DTCs may be caused by internal opens in the glow plugs. There are two different descriptions for an internal open in a glow plug. A fast open glow plug is a plug with an internal open circuitry, but no visual damage to the tip of the plug. A slow open glow plug is a plug that has internal open circuitry, and the tip of the plug is missing or damaged.
<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1802153&psdid=1233&evc=sm#ss2-1802153">Recommendation/Instructions:

Complete the current SI diagnostics for any symptoms or DTCs found. If the diagnostics for P0671-P0678 led to a glow plug resistance of more than 1 ohm, replace all of the glow plugs. If any of the glow plug tips are missing, the cylinder head must be removed. All debris needs to be removed from the cylinder. When the tip of the glow plug enters the cylinder, engine damage may occur. Make any engine mechanical repairs as needed.
  1. <LI type=1>A loose battery feed connection at the starter, alternator, or the Glow Plug Control Module (GPCM) may induce glow plug concerns. When the starter, alternator, or GPCM battery feed circuit has a poor connection, the GPCM will sense a voltage fluctuation, and induce the GPCM to power up the glow plugs. Untimed GPCM cycling may cause glow plug concerns. Inspect the connections at the starter, alternator, and both ends of the battery feed cable to the GPCM. Connector C1 terminal 1 at the GPCM is a quick disconnect type of connector. Make sure terminal fit is clean and tight and the quick disconnect is seated properly. The source or main power feed location differs depending on the vehicle being serviced. On GMT800 C/K model trucks, the power feed stud is located in the Under Hood Bussed Electrical Center (UBEC). To access this power feed stud, the secondary UBEC cover has to be removed. On GMT610 "G" vans inspect the underhood junction block connection. On GMT560 4500/5500 trucks inspect the secondary fuse block connection. <LI type=1>There are other electrical scenarios that can induce glow plug concerns. If the glow plug system senses a certain electrical "noise" on the power feed, the glow plugs may also go open. This electrical "noise" may be induced by jump starting, disconnecting the batteries with the ignition in the ON position, or a battery charger being used during a module reprogramming event. <LI type=1>If the glowplug DTCs have set on a very low mileage vehicle (below 1000 miles) the glowplugs may have been damaged by the engine start up test conducted at the engine assembly plant. <LI type=1>Do not replace the GPCM for all 8 internal opened glow plugs. GPCMs have been returned and inspected with no problem found.
  2. Complete all electrical circuit inspections and engine repairs as described above. After necessary repairs are completed, update the calibration in the GPCM. (See campaign 06522) Install the new GPCM software, and complete Fuel Injector Flow Rate Programming following SI procedures.
Note: Add-on remote starter or alarm kits must be removed before any glowplugs are replaced. Interruptions to normal starting procedures may induce glowplug concerns.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
Copyright General Motors Corporation. All Rights Reserved.
Document ID# 1802153
2006 Chevrolet Chevy K Silverado - 4WD
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Old 03-31-2006, 03:45 PM   #43 (permalink)
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Looks like GM is blaming the failed glowplug problem on add-on (aftermarket) remote starter and alarm kits. It appears as if they are laying down the ground work to start denying warranty repairs if these kits are installed? I wonder what the response might be from these aftermarket companies.
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Old 03-31-2006, 05:05 PM   #44 (permalink)
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Quote:
Originally Posted by RayMich View Post
Looks like GM is blaming the failed glowplug problem on add-on (aftermarket) remote starter and alarm kits. It appears as if they are laying down the ground work to start denying warranty repairs if these kits are installed? I wonder what the response might be from these aftermarket companies.
You may be right. On the other hand, I wonder how many trucks with broken glow plugs didn't have any add-ons. Mine was bone stock. Time will tell...Carmine
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Old 03-31-2006, 05:19 PM   #45 (permalink)
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Thanks again to all you DP.com members for the latest and greatest news! Dealer told me my truck is on "the list" for the recall. Apt made....
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Old 03-31-2006, 06:42 PM   #46 (permalink)
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g.p.c.m

can someone tell me if the gpcm is also referred to as a power control module, thanks
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Old 03-31-2006, 06:59 PM   #47 (permalink)
BIGR
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Took my truck in this morning for the recall and the service advisor asked me if I had been having any problems with the glow plugs. I told him no but I wanted to get the reprogram done. On the work order he put customer request recall 06522, reprogram pcm per GM. At first I thought he was going to tell me if I wasn't having any problems that they would not do the recall. I told him that I didn't want to get out on my 6000 mile vacation trip and have my truck malfunction. He agreed and said that they would take care of it. They also replaced the front differential autuator. It had been leaking some fluid for months. I am glad to get that work done and it eases my mind. I would have to say that dealership so far has been extremely nice and easy to deal with.
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Old 03-31-2006, 07:22 PM   #48 (permalink)
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Quote:
Originally Posted by BIGR View Post
Took my truck in this morning for the recall and the service advisor asked me if I had been having any problems with the glow plugs. I told him no but I wanted to get the reprogram done. On the work order he put customer request recall 06522, reprogram pcm per GM. At first I thought he was going to tell me if I wasn't having any problems that they would not do the recall. I told him that I didn't want to get out on my 6000 mile vacation trip and have my truck malfunction. He agreed and said that they would take care of it. They also replaced the front differential autuator. It had been leaking some fluid for months. I am glad to get that work done and it eases my mind. I would have to say that dealership so far has been extremely nice and easy to deal with.
bigr, so it does say program power control module on your work performed copy.
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Old 03-31-2006, 07:42 PM   #49 (permalink)
BIGR
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Yes it said: CUSTOMER REQUEST RECALL 06522
REPROGRAM PCM PER GM

I forgot to mention earlier that the service manager asked me if I had got anything in the mail about the recall and I said no. I was afraid that he was going to turn me down. I told him that I had read alot on the internet about the recall and he acted impressed. I guess he thought this guy has been doing his homework, we better do something. As far as I know my truck was the first one to get reprogrammed at that dealership.

Once again guys thanks for the heads up on this glow plug issue. If I had not read it on this forum I would have not found later until GM sent out a recall notice. That might have been too late.
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Old 03-31-2006, 07:52 PM   #50 (permalink)
epd
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Quote:
Originally Posted by BIGR View Post
Yes it said: CUSTOMER REQUEST RECALL 06522
REPROGRAM PCM PER GM

I forgot to mention earlier that the service manager asked me if I had got anything in the mail about the recall and I said no. I was afraid that he was going to turn me down. I told him that I had read alot on the internet about the recall and he acted impressed. I guess he thought this guy has been doing his homework, we better do something. As far as I know my truck was the first one to get reprogrammed at that dealership.

Once again guys thanks for the heads up on this glow plug issue. If I had not read it on this forum I would have not found later until GM sent out a recall notice. That might have been too late.
Thanks bigr, im new to diesels and i had mine reprogramed today, i also had to educate the dealer on this hole recall deal- he was unaware of the recall but took care of me without having any notice from gm.
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