24-NA-042

Bulletin No.:
Service Bulletin
Date:
24-NA-042
March, 2024
TECHNICAL
Subject:
Engine Misfire, Malfunction Indicator Lamp (MIL) Illuminated – DTCs P0300, P0030,
P0031, P0032, P0053, P0135, P0155, P0171 and/or P0172
Brand:
Model:
Chevrolet
Silverado
2500HD/3500HD
GMC
Sierra
2500HD/3500HD
Model Year:
from
to
2024
2024
VIN:
from
to
Engine:
Transmission:
6.6L (L8T)
Involved Region or Country
North America, Middle East, Israel, Palestine, Australia/New Zealand
Condition
Some customers may comment of one or more of the following conditions:
• Engine Misfire
• MIL Illuminated
Some technicians may find one or more of the following DTCs set in the Engine Control
Module (ECM):
• P0300: Engine Misfire Detected
• P0030: HO2S Heater Control Circuit Bank 1 Sensor 1
• P0031: HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
• P0032: HO2S Heater Control Circuit High Voltage Bank 1 Sensor 1
• P0053: HO2S Heater Resistance Bank 1 Sensor 1
• P0135: HO2S Heater Performance Bank 1 Sensor 1
• P0155: HO2S Heater Performance Bank 2 Sensor 1
• P0171: Fuel Trim System Lean
• P0172: Fuel Trim System Rich
Cause
This condition may be caused by the mis-routed Bank 1 Sensor 1 oxygen sensor wiring
harness, which is coming in contact with the exhaust pipe.
Correction
If you encounter a vehicle with the above concern, raise vehicle and inspect the oxygen
sensor wiring. If oxygen sensor wire is contacting the exhaust pipe or heat shield, it will
be necessary to replace the Bank 1 Sensor 1 oxygen sensor and ensure the sensor
wiring is routed away from the exhaust.
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Copyright 2024 General Motors LLC. All Rights Reserved.
Page 2
March, 2024
Bulletin No.: 24-NA-042
Service Procedure
6563511
Refer to Heated Oxygen Sensor Replacement - Bank 1
Sensor 1 in the Service Manual.
Parts Information
Note: Only select the parts that coincide with the repair
performed. Replace the part with the P/N outlined in the
Electronic Parts Catalog (EPC) in accordance with the
vehicle VIN.
Causal
Part
Description
SENSOR, HTD
OXY (PRECATALYST BANK
1 SEN 1)
X
Part
Number
Qty
12679885
1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
4025970
Heated Oxygen Sensor Replacement – Bank 1 Sensor 1
Use the Published Labor
Operations Time
Version
1
Modified
Released March 12, 2024
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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