20NA098

Service Bulletin
Bulletin No.:
20-NA-098
Date:
May, 2020
INFORMATION
Subject:
Information on Fuel Injector Replacement Guidelines During Service, Malfunction
Indicator Lamp (MIL) Illuminated - DTCs P0300-P0308, P050D, P0171, P0172, P0174,
P0175, P2099, P219A, and/or P219B Set
Attention: This bulletin applies to V6 and V8 Gasoline Engines ONLY.
Brand:
Cadillac
Chevrolet
GMC
Model:
GM
Passenger
Cars and
Trucks
Model Year:
from
2014
VIN:
to
2020
from
to
Engine:
Transmission:
LV1, LV3, L82,
L83, L84, L8B,
LT1, L86, L87,
LT2, LT4, LT5,
L8T, LTA
Involved Region or Country
North America, Europe, Uzbekistan, Russia, Middle East, Iraq, Israel, Palestine,
Argentina (Mercosur), Brazil (Mercosur), Bolivia (West), Chile (West), Colombia (West),
Ecuador (West), Paraguay (West), Peru (West), Uruguay (West), Venezuela (West),
Cadillac Korea (South Korea), GM Korea Company, China - SGM, Taiwan , Thailand
(ASEAN), Singapore, Phiippines
Information
During service of a vehicle that came in with an engine related DTC that required a fuel
injector replacement, we have seen cases of the incorrect fuel injector being installed in
the suspect cylinder. If this happens, it can lead to skewed Long Term Fuel Trims (LTFT)
and/or Short Term Fuel Trims (STFT) during engine operation. Some customers/
technicians may also notice that the vehicle has a MIL illuminated or possible rough idle
after an injector replacement.
Initial diagnosis may display any of these misfire and/or fuel trim related codes:
• P0300-P0308
• P050D
• P0171
• P0172
• P0174
• P0175
• P2099
• P219A
• P219B
Service Procedure
If during repair an injector replacement is required, it
will be necessary to refer to the parts catalog to ensure
the correct injector is ordered and installed in the
suspect cylinder. Refer to example below on how to
identify and order the correct injector.
• EXAMPLE:
– 2016 SILVERADO 1500 4WD CREW CAB
VIN# 3GCUKSECXGG251110
Engine RPO L83 – 5.3L
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
May, 2020
Bulletin No.: 20-NA-098
5595888
1. Identify which injector part number you have. The
8-digit injector part number can be found on the
injector body as shown.
2. Enter the VIN in the parts catalog and go to the fuel
injector rail parts section.
5595890
3. After the injector part number has been identified
on the body of the injector, in the description
column.
– For example, part number 12668390 highlighted
in the table.
– To the left is the part number that will need to be
order.
– In this example, that would be 12698484.
Bulletin No.: 20-NA-098
May, 2020
Page 3
5595894
Note: If for some reason the injector has been
removed, discarded or have all injectors on the bench
and are not sure which one goes where, then the best
thing to do is order the “NOM FLOW” injector part
number as shown above, in the quantity you need and
install them in the engine. In this case you would order
what is shown below.
When fuel rails are assembled at the supplier the
injector installed in the fuel rail can be nominal, low or
high flow injectors. This is done to try and get an even
balance or flow across the fuel rail for emission
requirements. Also, the replacement injector kits will be
a different part number than the injectors, and also that
a kit may contain one of several different injector part
numbers.
Version
1
Modified
Released May 05, 2020
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