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2017 Denali, at 62k injector 7 failed. at 72k injector 4 failed. With the milage I am well out of warranty so its being repaired again at the local diesel shop. I am on the road hauling with the truck 40+k a year. My confidence in my next haul is very ow. Is this something I am going to be nervous about every trip I make. We are looking at the wire connections today as well as that has been noted as possible part of the issue. Do I trade it in?
 

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Did you get some bad diesel? It happened to me and I had to drop the tank to clean it. Luckily it was on my 2000 7.3, and no damage to the injectors.
 

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There's an issue with the actual wiring going to the injectors that is the actual cause of the failure, I believe. The dealers incorrectly diagnose it as an injector failure.

I'm pretty sure that @M.A.M. had this almost exact problem on his l5p dually. I think he ended up replacing the injector wiring harness himself, and that resolved the problem.
 

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Dealer diagnosed my injectors as being bad a few times, and replaced them under warranty. The third time we diagnosed ourselves and discovered poor conductivity at the electrical connectors. Replaced all the connectors with gold plated LBZ connectors, and haven’t had a single injector issues in 200k miles.


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2017 Denali, at 62k injector 7 failed. at 72k injector 4 failed. With the milage I am well out of warranty so its being repaired again at the local diesel shop. I am on the road hauling with the truck 40+k a year. My confidence in my next haul is very ow. Is this something I am going to be nervous about every trip I make. We are looking at the wire connections today as well as that has been noted as possible part of the issue. Do I trade it in?
Isn't that covered under the power train warranty (100k miles)? My truck eats glow plugs and those repairs have been covered well beyond the 36k bumper to bumper warranty.
 

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L5p power train warranty is only 36k miles now.

Pretty pathetic for a basically $10k option
 

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L5p power train warranty is only 36k miles now.
Not exactly correct...there are exclusions though.

GMC said:
COVERED FOR 5 YEARS/60,000 MILES†

POWERTRAIN COVERAGE

All 2020 GMC vehicles come with a fully transferable, no-deductible, 5-year/60,000-mile (whichever comes first) Powertrain Limited Warranty. The 1500 Series Light-Duty (LD) pickups equipped with a 3.0L Duramax Turbo-Diesel and the 2500 and 3500 Series Heavy Duty (HD) pickups equipped with a 6.6L Duramax® Turbo Diesel Engine are covered for 5-years or 100,000 miles, whichever comes first. See dealer for details.
And here's the kicker....:|

Exclusions: Excluded from the powertrain coverage are sensors, wiring, connectors, engine radiator, coolant hoses, coolant, and heater core. Coverage on the engine cooling system begins at the inlet to the water pump and ends with the thermostat housing and/or outlet that attaches to the return hose. Also excluded is the starter motor, entire pressurized fuel system (in-tank fuel pump, pressure lines, fuel rail(s), regulator, injectors, and return line) as well as the Engine/Powertrain Control Module and/or module programming.
So, @70k, no bueno.
 

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And for more confusion -- what the website says is covered:

TODAY, on GMC website:

https://www.gmc.com/owners/warranty-details

POWERTRAIN COVERAGE

All 2020 GMC vehicles come with a fully transferable, no-deductible, 5-year/60,000-mile (whichever comes first) Powertrain Limited Warranty. The 1500 Series Light-Duty (LD) pickups equipped with a 3.0L Duramax Turbo-Diesel and the 2500 and 3500 Series Heavy Duty (HD) pickups equipped with a 6.6L Duramax® Turbo Diesel Engine are covered for 5-years or 100,000 miles, whichever comes first. See dealer for details.

The Powertrain Warranty covers repairs due to defects in materials and/or workmanship for components listed below:

ENGINE
All internally lubricated parts, engine oil, cooling hoses and lines. Also included are all actuators and electrical components internal to the engine, cylinder head, block, timing gears, timing chain, timing cover, oil pump/oil pump housing, OHC carriers, valve covers, oil pan, seals, gaskets, turbocharger, supercharger and all internal lubricated parts as well as manifolds, flywheel, water pump, harmonic balancer and engine mount. Timing belts are covered until the first scheduled maintenance interval. Exclusions: Excluded from the powertrain coverage are sensors, wiring, connectors, engine radiator, coolant hoses, coolant, and heater core. Coverage on the engine cooling system begins at the inlet to the water pump and ends with the thermostat housing and/or outlet that attaches to the return hose. Also excluded is the starter motor, entire pressurized fuel system (in-tank fuel pump, pressure lines, fuel rail(s), regulator, injectors, and return line) as well as the Engine/Powertrain Control Module and/or module programming.

TRANSMISSION/TRANSAXLE
All internally lubricated parts, case, torque converter, mounts, seals, and gaskets as well as any electrical components internal to the transmission/transaxle. Also covered are the actuators directly connected to the transmission (slave cylinder, etc.). Exclusions: Excluded from the powertrain coverage are transmission cooling lines, hoses, radiator, sensors, wiring, and electrical connectors. Also excluded are the clutch and pressure plate as well as any Transmission Control Module and/or Module programming.

TRANSFER CASE
All internally lubricated parts, case, mounts, seals, and gaskets as well as any electrical components internal to the transfer case. Also covered are any actuators directly connected to the transfer case as well as the encoder motor. Exclusions: Excluded from the powertrain coverage are transfer case cooling lines, hoses, radiator, sensors, wiring, and electrical connectors as well as the transfer case control module and/or module programming.

DRIVE SYSTEMS
All internally lubricated parts, final-drive housings, axle shafts and bearings, constant velocity joints, propeller shafts and universal joints. All mounts, supports, seals and gaskets as well as any electrical components internal to the drive axle. Also covered are any actuators directly connected to the drive axle (i.e., front differential actuator, etc.). Exclusions: Excluded from the powertrain coverage are all wheel bearings, drive wheel front and rear hub bearings, locking hubs, drive system cooling, lines, hoses, radiator, sensors, wiring and electrical connectors related to drive systems as well as any drive system control module and/or module programming.

COURTESY TRANSPORTATION PROGRAM
During the warranty coverage period, GMC provides alternate transportation and/or reimbursement of certain transportation expenses under the Courtesy Transportation Program if your vehicle requires warranty repairs. Several transportation options are available. Refer to your Owner’s Manual or consult your GMC dealer for more details.

ROADSIDE ASSISTANCE†
GMC is proud to offer the response, security, and convenience of the 24-hour Roadside Assistance Program for a period of 5 years/60,000 miles, whichever comes first. Refer to your Owner’s Manual for details, or consult your dealer/retailer. The Roadside Assistance contact information is listed in the Customer Assistance Offices section of the Warranty and Owner Assistance Information booklet.

WHAT IS NOT COVERED
All the above items are not covered for damage due to accident, misuse, alteration, insufficient or improper maintenance, contaminated or poor quality fuel, damage or corrosion due to chemical treatments or Aftermarket Products, impact, use or environment. For complete details, refer to your Warranty and Owner Assistance Information booklet. Other coverages are not extended or altered due to this supplement.





The 2019 warranty booklet is the most current one that can be downloaded.
(Gas and diesel info is intertwined)

Excerpts from it say:

Powertrain Coverage

. Coverage is provided for 5 years or 60,000 miles, whichever comes first

. 2500 and 3500 Series Heavy Duty (HD) Pickups equipped with a 6.6L Duramax Turbo-Diesel Engine are covered for 5 years or 100,000 miles whichever comes first.

. Certain commercial fleet and/or government fleet vehicles purchased under a qualifying fleet account number are covered for 5 years or 100,000 miles, whichever comes first.

Engine Coverage includes: All internally lubricated parts, engine oil cooling hoses and lines. Also included are all actuators and electrical components internal to the engine (e.g., Active Fuel Management Valve Lifter Oil Manifold) cylinder head, block, timing gears, timing chain, timing cover, oil pump/oil pump housing, OHC carriers, valve covers, oil pan, seals, gaskets, manifolds, flywheel, water pump, harmonic balancer, engine mount, turbocharger, and supercharger. Timing belts, and other associated components required in the timing belt service replacement procedure are covered until the first scheduled maintenance interval.


Diesel Components Coverage includes:
Cylinder block and heads and all internal parts, intake and exhaust manifolds, timing gears, timing gear chain or belt and cover, flywheel, harmonic balancer, valve covers, oil pan, oil pump, water pump, fuel pump, engine mounts, seals, and gaskets. Parts of the Emissions Reduction System such as the emissions reduction fluid tank, injectors, sensors including NOX and exhaust, and the Exhaust Particulate Filter.

Glow Plug Control System: Control/glow plug assembly, glow plugs, cold advance relay, and engine control module.
The fuel injection control module, integral oil cooler, transmission adapter plate, common fuel rails, fuel filter assembly, fuel
temperature sensor, and function block.



Important: Some of these components may also be covered by the Emissions Warranty. See Emission Warranty Parts List pg 23

Exclusions:
Excluded from the powertrain coverage are sensors, wiring, connectors, engine radiator, coolant hoses, coolant, and heater core.
Coverage on the engine cooling system begins at the inlet to the water pump and ends with the thermostat housing and/or outlet that attaches to the return hose.

Also excluded is the starter motor, entire pressurized fuel system (in-tank fuel pump, pressure lines, fuel rail(s), regulator, injectors, and return line) as well as the Engine/ Powertrain Control Module and/or module programming.





In the booklet gas and diesel are intertwined.
It may be that the 'exclusions' list at the end is intended for the gasoline engines

The diesel coverage paragraphs specifically say ' fuel injection control module, integral oil cooler, transmission adapter plate, common fuel rails, fuel filter assembly, fuel temperature sensor, and function block' -- even though the exclusions list includes fuel rails/regulators/injectors/return lines.




They could eliminate a lot of confusion both with customer and dealer by cleaning this up.
It's not a new problem.

I first had problems with it in early 'teens with my '11 LML.
Dealer denied coverage. Was pretty sure there was coverage under diesel portion of warranty, but was busy so paid under protest and went on my way.

It was later reversed.
Bill repaid.
Apologies from both GM and the dealer, and of course a credit for future use.
 

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To add to everybody’s bewilderment, my injectors that were replaced (about 5 total) were between 90-100k miles.


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