Bulletin No.:

Service Bulletin

Date:

15-06-01-002J
May, 2020

TECHNICAL
Subject:

Engine Misfire/Tick Noise, Malfunction Indicator Lamp (MIL) Illuminated - DTC
P0300 Set

Models:

2015-2019 Cadillac Escalade
2016-2019 Cadillac CTS-V
2014 Chevrolet Silverado 1500
2014-2019 Chevrolet Corvette
2015-2018 Chevrolet Silverado
2015-2019 Chevrolet Suburban, Tahoe
2016-2019 Chevrolet Camaro
2019 Chevrolet Silverado LD
2014 GMC Sierra 1500
2015-2018 GMC Sierra
2015-2019 GMC Yukon, Yukon XL
2019 GMC Sierra Limited
Equipped with 5.3L Engine (RPOs L83, L8B) or 6.2L Engine (RPOs L86, LT1, LT4)

Attention: This bulletin also applies to any of the above models that may be sold/Exported to the
following Regions/Countries: North America, Europe, Uzbekistan, Russia, Middle East,
Iraq, Israel, Palestine, Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay,
Peru, Uruguay, Venezuela, Japan, Cadillac Korea (South Korea), GM Korea Company,
China, Taiwan, Thailand, Singapore, Philippines, Egypt, Other Africa, South Africa
This bulletin has been revised to add the Export regions to the Attention statement, add
Exhaust Manifold Bolt P/N 11546600 and change the Warranty coverage statement to include
both Powertrain and Emissions. Please discard Corporate Bulletin Number 15-06-01-002I.

Condition

Correction

Some customers may comment on a malfunction
indicator lamp (MIL) on and/or an engine misfire/tick
noise.
Technicians may find DTC P0300 set or in history.

Note: Inspect the camshaft for damage while the lifters
are removed from the engine. If damage is found,
replace the camshaft per SI.

Cause
This may be caused by one of the following conditions:
• Active fuel management (AFM) lifter that is
mechanically collapsed and/or stuck all of
the time.
• Internal locking pin damage in the lifter, due to oil
aeration.
• Lifter that has collapsed and is stuck in the
lifter bore.
• The engine may have a bent push rod.

Copyright 2020 General Motors LLC. All Rights Reserved.

If SI diagnosis does not isolate the cause of this
concern, technicians should inspect for valve operation.
If the valve(s) are not moving, replace the valve lifter oil
manifold and affected bank of AFM lifters. Refer to
Valve Lifter Oil Manifold Replacement and Valve Lifter
Replacement in SI.
If the lifter has spun the bore, the guides should also be
replaced.

Recommendation/Instructions
There are two approved processes for removing the
lifter when stuck in the bore.

Page 2

May, 2020

Bulletin No.: 15-06-01-002J

Parts Information
Note: Only select the parts the coincide with the repair
performed.

4250109

Causal
Part

Part
Number

N/A

Description

Qty

12660737

MANIFOLD ASM-VLV
LFTR OIL (SERV KIT)
(L83, L86, or LT1)

1

N/A

12660736

MANIFOLD ASM-VLV
LFTR OIL (SERV
KIT) (LT4)

1

N/A

12645725

LIFTER ASMVLV (AFM)

4
(per
Bank)

N/A

12659260

GASKET-CYL
HD (6.2L)

1

N/A

12622325

GASKET-CYL
HD (5.3L)

1

N/A

11546959

RIGHT SIDE
CYLINDER HEAD
BOLTS

10

N/A

11611976

LEFT SIDE CYLINDER
HEAD BOLT

1

N/A

11546959

LEFT SIDE CYLINDER
HEAD BOLTS

9

N/A

11546600

BOLT, EXH MANIF

5
(per
Bank)

N/A

12657093

GASKET-EXH MANIF

1

N/A

12626354

GASKET-INT MANIF

8

N/A

Refer
to EPC

SEAL, EXH SYS

N/A

12619787

GASKET-VLV RKR
ARM CVR

1

N/A

12623308

GASKET-F/PMP BRKT

1

N/A

12618336

PIPE ASM-FUEL
FEED INTER

1

N/A

12618337

PIPE ASM-FUEL
FEED INTER

1

N/A

12668553

SEAL KIT-F/INJR
(O RING)

2

1. Use vice grips with a slide hammer.

4921302

Note: Be sure NOT to pry on the sealing surface of the
block, as shown in the illustration above.
2. Use vice grips with a small pry bar.
Typically, one of the above approved processes will
remove the lifter that is stuck in the bore. If not, the
engine will need to be replaced.
With the lifter removed, be sure to inspect the bore for
any damage. Typically, the lifter bores will look good
with no indication of damage.

1

Bulletin No.: 15-06-01-002J

May, 2020

Warranty Information
Vehicles repaired are covered under Powertrain
warranty coverage and Emissions warranty coverage
(Code E). Use the following labor operations, and claim
should be submitted under the appropriate repair
coverage limits. Reference the Applicable warranties
section of Investigate Vehicle History (IVH) for
coverage information.

Page 3

Labor
Operation

Description

Labor Time
9.4 hrs (Silverado,
Sierra)

4080978*

Valve Lifter Oil
Manifold and Valve
Lifter Left Side
Replacement

14.8 hrs (CTS-V)
9.2 hrs (Escalade,
Suburban, Tahoe,
Yukon)
11.7 hrs (Corvette)
7.0 hrs (Camaro)
10.9 hrs (Silverado,
Sierra)

4080988*

Valve Lifter Oil
Manifold and Valve
Lifter Right Side
Replacement

15.5 hrs (CTS-V)
9.3 hrs (Escalade,
Suburban, Tahoe,
Yukon)
11.4 hrs (Corvette)
9.0 hrs (Camaro)

*This is a unique Labor Operation for bulletin use only.

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.

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