NHTSA ID Number: 10183197
Manufacturer Communication Number: 20NA195
Summary
This technical bulletin provides a procedure to replace the NOx2 sensor if found the cause of the customers concern.
Parts Information
| Causal Part | Description | Part Number | Qty |
| X | SENSOR, NOX (POSN 2) | 12695882 | 1 |
SEOCONTENT-START
– 2020 – CRC – 10/26/20
Copyright 2020 General Motors
LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 20-NA-195
Date: October, 2020
TECHNICAL
Subject: Malfunction Indicator Lamp (MIL) Illuminated – DTC P0421, P0422, P0480, P119E,
P11D0, P11DB, P11DC, P11FC, P20EE, P220B, P22A0, , P22A2, P22A3 and/or P24A0 Set
Attention: This bulletin only applies to cab chassis 1003 and 1403.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Silverado 2500HD/
3500HD
2020 2020 L5P
GMC Sierra 2500 HD/
3500HD
Involved Region or Country North America, Middle East, Israel, Palestine
Condition
Some customers may comment that the MIL is illuminated.
Some technicians may find one or more of the following DTCs set in the Engine Control
Module (ECM):
• P0421: Catalyst 1 Low Efficiency
• P0422: Catalyst 2 Efficiency Below Threshold Bank 1
• P0480: Cooling Fan Speed Output Circuit
• P119E: NOx Sensor 2 Signal Circuit Low
• P11DB: NOx Sensor 1 Current Performance
• P11DC: NOx Sensor 2 Current Performance
• P11D0: O2 Signal Circuit (NOx Sensor 2)
• P11FC: O2 Low Reference Circuit (NOx Sensor 2)
• P22A3: NOx Sensor 2 Heater Control Circuit
• P20EE: NOx Catalyst Efficiency Below Threshold
• P220B: NOx Sensor 2 Supply Voltage Circuit
• P24A0: NOx Sensor 2 Circuit Low Voltage
– 2020 – CRC – 10/26/20
Page 2 October, 2020 Bulletin No.: 20-NA-195
Cause
5651968
This condition may be caused by a damaged NOx2 sensor, as shown in the graphic
above.
Correction If the sensor is found to be damaged, replace the NOx 2 sensor
Service Procedure
Refer to Nitrogen Oxides Sensor Replacement – Position 2 in SI.
Parts Information
Causal
Part
Description Part
Number
Qty
X SENSOR, NOX
(POSN 2)
12695882 1
– 2020 – CRC – 10/26/20
Bulletin No.: 20-NA-195 October, 2020 Page 3
Warranty Information
For vehicles repaired under the Emission coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation Description Labor Time
4087568* Nitrogen Oxides Sensor Replacement – Position 2 for
DTCs Set
0.7 hrs
*This is a unique Labor Operation for Bulletin use only.
Version 1
Modified Released October 23, 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
SEOCONTENT-END
2 Affected Products
Vehicles
1 Associated Document
Manufacturer Communications
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