20NA110

Service Bulletin
Bulletin No.:
20-NA-110
Date:
June, 2020
INFORMATION
Subject:
Brand:
Information on Diesel Exhaust Fluid Pump is Unable to Build Pressure After
Replacement
Model:
Colorado
Chevrolet
GMC
Model Year:
from
to
2017
2020
VIN:
from
to
Engine:
Transmission:
LWN
Cruze
2017
2020
LH7
Express
2017
2020
LWN
Equinox
2018
2019
LH7
Silverado
2017
2018
L5P
Silverado 1500 (New
Model–12th VIN=7)
2019
2019
LM2
Silverado 1500
2020
2020
LM2
Silverado 2500/3500
2019
2020
L5P
Silverado 4500HD/
5500HD/6500HD
2019
2020
Silverado LD
2019
2019
LM2
Canyon
2017
2020
LWN
Savanna
2017
2019
LWN
-
-
L5D
Sierra
2017
2018
L5P
Sierra 1500
2020
2020
LM2
Sierra 2500/3500
2019
2020
L5P
Sierra Limited
2019
2019
LM2
Terrain
2018
2019
LH7
-
Involved Region or Country
North America
Condition
Some technicians may comment that after replacing the DEF pump, the pump won't build
pressure and one or more of the following DTCs may set:
• P20E8: Reductant Low Pressure
• P249C: Excessive Time To Enter Closed Loop Reductant Injection Control
Information
If it has been determined that after replacing the DEF pump and confirmed proper
operating that the system is unable to build pressure. Inspect for any leaks, loose
connections or kinks in the supply line.
After performing an initial leak test three times. If low pressure is present, this may be
because the DEF pump filter has dried out.
Allow the vehicle to sit overnight with the new pump and DEF fluid, to re-saturate the DEF
pump filter. In the morning, perform the leak test three additional times. The pump should
now be able to build pressure.
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
June, 2020
Bulletin No.: 20-NA-110
Parts Information
No parts are required for this repair.
Warranty Information
Important: Only apply the additional labor time if the
vehicle requires overnight soak time and re-test.
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
4087458*
Perform DEF Pump Pressure Test.
0.4 hr
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
Released June 11, 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.
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