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Old 09-09-2009, 01:55 PM   #1 (permalink)
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Dealer replaced just one glow plug

Number 8 glow plug went out on my truck and I took it back to the dealer early this week to have them replace it under warranty. Since I knew the code was for a glow plug I asked that they replace all 8 since I'd heard that's what GM's book said. They called today and said it was ready to pick up. I asked if they replaced all 8 and the response was the tech said the others looked fine. I'm no mechanic, but can you tell if a glow plug "looks" fine? Where specifically can I tell them to look (GM repair manual, memo, or whatever) where it says to replace them all? I really don't want to be dropping my truck off throughout the winter to have one glow plug at a time replaced. Thanks for the help.
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Old 09-09-2009, 03:30 PM   #2 (permalink)
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I think that would be the normal policy.They're not going to replace it unless it's bad.
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Old 09-09-2009, 03:34 PM   #3 (permalink)
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Ive heard GM policy is to replace ALL glow plugs even if one fails.
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Old 09-09-2009, 04:22 PM   #4 (permalink)
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Heard the same thing which is why I'm asking. Someone on here before mentioned it's in GM's manual or something to replace them all.
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Old 09-09-2009, 07:27 PM   #5 (permalink)
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I've never heard that..they should only replace what is bad..which your 06 will have codes for the faulty ones.
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Old 09-10-2009, 02:53 AM   #6 (permalink)
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yep I tried very hard, and argued with them about changing the rest.
They will only change the one thats faulty.
Just said when the others go bad, bring it back.
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Old 09-11-2009, 04:15 PM   #7 (permalink)
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A friend of mine just took her 06 in yesterday because the check engine light was on. They said 1 of the glow plugs was bad and they didn't have all of them in stock. They said they had to replace all 8 because they got a bulletin from GM that said if they need to replace 1 glow plug they have to replace all 8 at the same time.
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Old 09-11-2009, 04:41 PM   #8 (permalink)
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Had one go out in July.
Chevy only replaced the bad plug, and when I pressed them to fix all 8 based on new bulletin, they said dealer has option to replace all 8 or one at a time.
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Old 09-11-2009, 04:51 PM   #9 (permalink)
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Have seen a decent amount lately coming in for glow plug related dtc's. This bulletin describes some of your questions

#PIP3586F: Diesel Engine Glow Plug Trouble Codes - keywords 6.6 6.6L calibration circuit glowplug hard indicator LBZ LLY LMM module multiple P064C P0671 P0672 P0673 P0674 P0675 P0676 P0677 P0678 program - (Aug 6, 2009)

Subject:Diesel Engine Glow Plug Trouble Codes

Models:2006-2009 Chevrolet Express
2006-2009 Chevrolet Kodiak
2006-2007 Silverado Classic
2006-2009 GMC Savana
2006-2007 GMC Sierra Classic
2006-2009 GMC Topkick

This PI was superseded to change NOTE to include DTCs and not to replace GPCM. Please discard PIP3586E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
<A href="">Condition/Concern:

A dealer may encounter a customer concern of the SES light on, a Glow Plug Control Module (GPCM) DTC, or individual cylinder glow plug DTCs. A loose battery feed connection at the battery, starter, alternator, or the Glow Plug Control Module (GPCM) may induce glow plug concerns.
This PI will describe and assist with concerns related to GPCM and/or Glow Plug DTCs.
<A href="">Recommendation/Instructions:

The first portion of this PI will discuss GPCM diagnostics and repairs.
If a vehicle has been brought in with GPCM concerns or DTC P064C the GPCM battery positive cable will need to be inspected. Inspect for loose connections at the GPCM Connector (squeeze type terminal number C1 or X1) and at the power source/mega fuse. If the squeeze type terminal is damaged, the complete cable would need replaced. If the GPCM terminal is damaged, the GPCM would need replaced. Retorque loose mega fuse/power source connections using current SI specifications.
Note: The source or main power feed to the GPCM differs depending on the vehicle being serviced. Use the current SI power feed distribution schematics for power feed location.
If a 2007-2008 GMT900 C/K truck has DTC P064C, and both ends of the main power feed terminal have been inspected it's possible to have a cable crimping concern. The crimp may not make a positive connection, and will not be easily detected. If necessary replace the GPCM Battery Positive Cable on 2007-2008 GMT900 C/K trucks.
Evaluate DTC P064C after connections are inspected and repaired. Complete the following steps twice to see if P064C resets.
Start engine; let the engine run for at least 2 minutes, ignition off for at least 2 minutes, restart engine to verify P064C has not returned. If P064C resets after all connections have been repaired (GPCM has NOT been replaced yet) replace the GPCM.
This section of the PI discusses Glow Plug diagnostics and repairs.
Glow plug DTCs P0671-P0678 may be caused by internal opens in the glow plugs. There are two different descriptions for an open in a glow plug. A fast open glow plug is a plug with an internal open circuitry, with 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.
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 must be removed from the cylinder. When the tip of a glow plug enters the cylinder, engine damage may occur. Make any engine mechanical repairs as needed.
There are certain electrical concerns that may induce the glow plug to go open. If the glow plug system senses a certain electrical "noise" on the power feed, it could induce glow plug concerns. This electrical "noise" may be induced by jump starting, loose connections, disconnecting the batteries with the ignition in the ON position, or a battery charger being used during a module reprogramming event.
Complete all electrical circuit inspections and engine repairs as described. On 2006 model year vehicles be sure the updated calibration was installed into the GPCM per Campaign 06522. After installing the new GPCM software, complete the Fuel Injector Flow Rate Programming following SI procedures.
Note: Do not replace the GPCM for any one or combination of the following internal open glow plug codes: P0671, P0672, P0673, P0674, P0675, P0676, P0677 or P0678 when not accompanied by GPCM Diagnostic Trouble Codes. GPCMs have been returned and inspected with no problem found.
Note: Aftermarket Add-on remote starter or alarm kits must be removed before any glow plugs 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.


Also every truck that has come in for with glow plug related dtc's and has been tested following the flow chart on SI has had all 8 glow plugs replaced. I copied this directly from SI it reads "Ignition OFF, and the affected glow plug disconnected, measure the resistance between the affected glow plug terminal and ground with a DMM for less than 1 ohm.
⇒If the resistance is greater than 1 ohm, replace all of the glow plugs."
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Old 09-14-2009, 04:20 PM   #10 (permalink)
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Also every truck that has come in for with glow plug related dtc's and has been tested following the flow chart on SI has had all 8 glow plugs replaced. I copied this directly from SI it reads "Ignition OFF, and the affected glow plug disconnected, measure the resistance between the affected glow plug terminal and ground with a DMM for less than 1 ohm.

⇒If the resistance is greater than 1 ohm, replace all of the glow plugs."

where does it say this? im taking mine in next week and i asked them about this. 100 dollars deductable everytime i bring it in adds up. i dont want to have to be back 6 more times.
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