A New Way to Look at NOx Sensor Readings and Exhaust Temperature During a DPF Regeneration or a Reductant System Malfunction Warning Service Bay Test – 2016-2021 Chevrolet Colorado & GMC Canyon

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– 2016,2018,2017,2019,2020,2021 – CRC – 10/23/20
Copyright 2020 General Motors LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 16-NA-206
Date: October, 2020
INFORMATION
Subject: A New Way to Look at NOx Sensor Readings and Exhaust Temperature During a DPF
Regeneration or a Reductant System Malfunction Warning Service Bay Test
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Colorado
2016 2021 2.8L
GMC Canyon Diesel (LWN)
Involved Region or Country North America, Middle East, Israel, Palestine, GM Korea Company
Introduction
The following procedure is to aid in graphing NOx
sensor readings and temperature sensor readings
using the GDS2.
Information for the temperatures and NOx sensors can
be pulled from the DPF Service Regeneration and the
Reductant System Malfunction Warning Service Bay
Test from session files or stored data in GDS2.
Suggested Procedure for Graphing the
DPF Service Regeneration
Temperatures
Locate the DPF Service Regeneration in the
Stored Data:
1. Select the Review Tab.
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2. Select the Diagnostic Data Display tab.
3. Select the Exhaust Gas Temperature Sensor 1.
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Note: The LOCK PARAMETER BUTTONS must be
selected after each parameter has been selected to be
graphed.
4. Select the Lock Parameter button located at the
upper right side of display.
5. Repeat the steps above to add the Exhaust Gas
Temperature Sensor 2, 3, 4 and 5.
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6. Select the Line Graph tab.
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7. On the right side of the display, select the Show/
Hide Control arrow button.
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8. Select the Change Scale button.
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Note: When selecting the temperature values, the
parameters should be all on the same scale.
9. Under the Parameters Values, select the MIN and
MAX parameters for graphing out the readings.
10. Select OK.
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Bulletin No.: 16-NA-206 October, 2020 Page 5
Graph Results
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Graphed results of the exhaust temperatures during the
DPF Service Regeneration.
Recommended parameter values;
• Enter 400 under MIN.
• Enter 1200 under MAX.
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Note: NOx Sensor 2 may have higher readings than
the NOx sensor 1 during a regeneration.
Graphed results of the NOx sensors during the DPF
Service Regeneration.
Recommended parameter values;
• Enter 0 under MIN.
• Enter 200 under MAX.
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Bulletin No.: 16-NA-206 October, 2020 Page 7
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Graphed results of the exhaust temperature readings
during the Reductant System Malfunction Warning
Service Bay test.
Recommended parameter values;
• Enter 400 under MIN.
• Enter 620 under MAX.
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Graphed results of the NOx sensor readings during the
a Reductant System Malfunction Warning Service
Bay test.
Recommended parameter values;
• Enter 0 under MIN.
• Enter 360 under MAX.
Version 3
Modified
Released June 23, 2016
Revised September 05, 2017 — Updated Model Years.
Revised October 22, 2020 – Added 2019-2021 Model Years.
Additional Keywords 2.8, soot, fuel, NOx, Nitrogen
Oxide, O2, Regen, Regeneration, Fuel, SCR, LWN,
EGT, DOC, DPF, Exhaust, Particulate, Fluid, Quality,
Message, P2463, P20EE, P219D, P249E, P2BAA,
P2459, P144E, P144F
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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