Engine Misfire/Tick Noise. Malfunction Indicator Lamp (MIL) Illuminated with DTC P0300 Set – 2014-2018 Cadillac Chevrolet & GMC

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Service Bulletin Bulletin No.: 15-06-01-002K
Date: December, 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 from 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 update the Parts Information section.
Please discard Corporate Bulletin Number 15-06-01-002J.
Condition
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.
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.
Correction
Note: Inspect the camshaft for damage while the lifters
are removed from the engine. If damage is found,
replace the camshaft per SI.
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.
Page 2 December, 2020 Bulletin No.: 15-06-01-002K
Recommendation/Instructions
There are two approved processes for removing the
lifter when stuck in the bore.
4250109
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.
Parts Information
Note: Only select the parts the coincide with the repair
performed.
Causal
Part
Part Number Description Qty
N/A 12699740 MANIFOLD
ASM-VLV
LFTR OIL
(SERV KIT)
(L83, L86
or LT1)
1
N/A 12699793 MANIFOLD
ASM-VLV
LFTR OIL
(SERV
KIT) (LT4)
1
N/A 12659260 GASKETCYL
HD (6.2L)
1
N/A 12622325 GASKETCYL
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 12657093 GASKETEXH
MANIF
1
N/A 12626354 GASKETINT
MANIF
8
N/A Refer to EPC SEAL,
EXH SYS
1
N/A 12619787 GASKETVLV
RKR
ARM CVR
1
N/A 12623308 GASKET-F/
PMP BRKT
1
N/A 12668553 SEAL KIT-F/
INJR
(O RING)
2
Bulletin No.: 15-06-01-002K December, 2020 Page 3
Warranty Information
For vehicles repaired under the base Emission
warranty coverage (Code E), use the following labor
operation. Reference the Applicable Warranties section
of Investigate Vehicle History (IVH) for coverage
information.
Labor
Operation
Description Labor Time
4080978*
Valve Lifter Oil
Manifold and Valve
Lifter Left Side
Replacement
9.4 hrs (Silverado,
Sierra)
14.8 hrs (CTS-V)
9.2 hrs (Escalade,
Suburban, Tahoe,
Yukon)
11.7 hrs
(Corvette)
7.0 hrs (Camaro)
4080988*
Valve Lifter Oil
Manifold and Valve
Lifter Right Side
Replacement
10.9 hrs
(Silverado, Sierra)
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.

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