16NA241

File in Section:
Bulletin No.:
Service Bulletin
Date:
16-NA-241
August, 2016
TECHNICAL
Subject:
Brand:
Cadillac
Engine Misfire, Ticking/Knocking Noise, No Compression due to Piston Damage,
Malfunction Indicator Lamp (MIL) Illuminated
Model:
Escalade
CTS - V
Model Year:
VIN:
from
to
2007
2017
from
Engine:
Transmission:
LC8, L20, LH6,
L76, L77, L83,
L86, L92, L94,
L96, L9H, LC9,
LFA, LH6, LH8,
LH9, LMF,
LMG, LT1, LT4,
LV3, LY2, LY5,
LY6 or LZ1
-
to
Avalanche
Camaro
Colorado
Chevrolet
Corvette
2007
2017
Silverado
-
Suburban
Tahoe
Canyon
GMC
Sierra
2007
2017
2007
2010
-
Yukon
HUMMER
H2
Involved Region or Country
North America and N.A. Export Regions
Condition
Some customers may comment on the following conditions:
• Malfunction Indicator Light (MIL) illuminated.
• Engine misfire.
• Engine ticking/knocking noise.
The Technician may find no compression on the misfiring cylinder(s) with 100% leakage
into the crankcase.
Cause
This may be caused by an aftermarket ECM calibrations/components and detonation,
that lead to a melted piston.
Correction
If SI diagnosis isolates no compression on the misfiring
cylinder(s) with 100% leakage into the crankcase,
perform the following steps as necessary before
disassembling the engine:
1. If a lighted bore scope is available, inspect the top
of the related piston(s) through the spark plug hole
to determine if any of the pistons are melted as
shown below. These photos all show examples of
pistons that were damaged/melted due to
detonation that was induced from aftermarket
calibrations and/or components. If this type of
piston damage is noted, it is most likely the result
of aftermarket ECM calibrations and/or
components. Follow the remaining steps to
Copyright 2016 General Motors LLC. All Rights Reserved.
Page 2
August, 2016
Bulletin No.: 16-NA-241
determine if this is a warrantable repair. If this type
of piston damage is present and aftermarket items
are found during steps 2 or 3, this should not be
considered a warrantable repair.
2. Inspect for aftermarket components, such as an
exhaust, ignition, high performance air filter (K&N
style), or air intake system. Take photos and
document accordingly if anything is found.
3. Determine if factory ECM calibration numbers and
CVNs are present by following the latest version of
Bulletin 09-06-04-026.
2222090
2222086
2222092
2222088
Version
1
Modified
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION