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Old 05-17-2011, 05:54 PM   #1 (permalink)
dsandersonj
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Lbz. Check engine light

Go to start the truck. Ignition on check engine light flawed twice and beeps twice. Glow plug light won't go out. What's the next step?
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Old 05-17-2011, 06:40 PM   #2 (permalink)
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Not heard of it beeping twice but have you tried to read any codes yet? If not I would try that and post them if any.

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Old 05-17-2011, 06:52 PM   #3 (permalink)
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The LBZ engines had a glow plug problem. GM had a special Policy to replace the GPs and do a reflash of the ecm. Might check with a dealer. The GPs are about $25 each-??
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Old 05-17-2011, 09:03 PM   #4 (permalink)
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nope they wont replace any glows plugs it was just a buliten. good to autozone or a place to read the code. have u tryed to start it might take a bit it one or two plugs are bad.
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Old 05-17-2011, 09:40 PM   #5 (permalink)
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Scan it and post back, its a shot in the dark until then as to what the issue is
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Old 05-18-2011, 07:29 AM   #6 (permalink)
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It starts OK. In fact I don't notice a difference in the way it starts whatsoever. I will try to scan it today.
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Old 05-18-2011, 10:30 AM   #7 (permalink)
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Quote:
Originally Posted by JC1843 View Post
The LBZ engines had a glow plug problem. GM had a special Policy to replace the GPs and do a reflash of the ecm. Might check with a dealer. The GPs are about $25 each-??
I believe they are covered under the emission warranty-- look in the owner's manual-!
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Old 05-18-2011, 04:08 PM   #8 (permalink)
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Quote:
Originally Posted by liftlawssuck View Post
nope they wont replace any glows plugs it was just a buliten. good to autozone or a place to read the code. have u tryed to start it might take a bit it one or two plugs are bad.

They will replace the plugs if you are under 100k miles, my dealer did and so have many others. This was a known issue with LBZ's. Do not let them only replace one plug, they should replace all 8


#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)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

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.

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 2006modelyearvehicles 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 remotestarter 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.
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Old 05-18-2011, 06:44 PM   #9 (permalink)
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Quote:
Originally Posted by subman1980 View Post
They will replace the plugs if you are under 100k miles, my dealer did and so have many others. This was a known issue with LBZ's. Do not let them only replace one plug, they should replace all 8


#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)~~~~
Not true, there is a new PIP, see Dealer replaced just one glow plug
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Old 05-18-2011, 07:19 PM   #10 (permalink)
subman1980
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Originally Posted by navybuff View Post
Not true, there is a new PIP, see Dealer replaced just one glow plug
Good to know,

Per that new PIP they will replace all 8 if the tip of the faulty plug is damaged. Mine were ALL eroded like the photo and would have qualified for replacement even under the new PIP. I was just happy not to have a tip missing and require engine teardown. I do not trust my dealer any farther than I could throw them and requested to see my old plugs, and ended up watching the tech remove them.
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Cognito UCA's, PSC Pump and remote mount reservoir, Red Head steering gear, Fox reservoir shocks front and rear, sulastic shackles, Thanks NORCAL Truck... More to come!

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Last edited by subman1980; 05-18-2011 at 07:20 PM.
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