Bulletin No.: PIE0811

Service Bulletin

Date: January, 2025

ENGINEERING INFORMATION
Engineering Information - Service Engine Soon, Service Emission System,
and/or Service Exhaust Fluid System Message on Driver Information Center
(DIC), DTCs P249C, P20E8 Set

Subject:

Attention:

Brand:

Proceed with this EI ONLY if the customer has commented about this
concern AND the PIE number is listed in the Global Warranty
Management / Investigate History link (GWM/IVH). If the customer has not
commented about this condition or the EI does not show in GWM/IVH,
disregard the PIE, and proceed with diagnostics found in published
service information. THIS IS NOT A RECALL refer to Service Bulletin
04-00-89-053 for more details on the use of Engineering Information
bulletins.
Model:

Chevrolet

Silverado 1500

GMC

Sierra 1500

Involved Region or Country

Model Year:

Breakpoint:

from

to

from

to

2024

2025

—

—

Engine:

Transmission
:

Equipped with 3.0L
(RPO LZ0)

—

U.S. Dealers ONLY
Some customers may comment on having one or more of the following messages
showing on the Driver Information Center (DIC).
• Service Engine Soon
• Service Emission System

Condition

• Service Exhaust Fluid System
Technicians may fine one or both DTCs set.
• P249C - Excessive Time to Enter Closed Loop Reductant Injection Control
• P20E8 - Reductant Low Pressure
GM Engineering is attempting to determine the root cause of the above condition.
Engineering has a need to gather information on vehicles PRIOR to repair that may
exhibit this condition. As a result, this information will be used to "root cause" the
customer's concern and develop/validate a field fix.

Cause

Correction
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.
If you encounter a vehicle with the above concern, perform the following steps and contact the engineer listed below:
1. Perform a Reductant System Leak Test. Does the test pass?
1.1.

If yes, refer to SI for the diagnostic procedure for DTC P249C and/or P20E8.

Copyright 2025 General Motors. All Rights Reserved.

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January, 2025

Bulletin No.: PIE0811

6793855

1.2.

If no, is there a leak at the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe, or at one of
the two connections to the Reductant Fluid Injector, or the Emission Reduction Fluid Pump Outlet Port, as
shown in the picture above.

Note: If possible, take a clear close-up picture of the connection interface, as shown in the picture above.
1.3.

If no, refer to SI for the diagnostic procedure for DTC P249C and/or P20E8.

1.4.

If yes, is the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe or the connector
damaged in any way?

1.5.

If yes, replace the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe, perform a
Reductant System Tamper Warning Service Bay Test, and release the vehicle back to the customer.

1.6.

If no, contact the engineer listed below first, then follow the Cleaning Procedure outlined below, perform a
Reductant System Tamper Warning Service Bay Test, and release the vehicle back to the customer.

Cleaning Procedure

6793858

Bulletin No.: PIE0811

January, 2025

Page 3

6793862

The Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe may be contaminated with crystallized
DEF in or around the connector, as shown in the pictures above. This procedure outlines the correct cleaning
procedure before attempting to re-connect the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe to
the Reductant Fluid Injector or the Emission Reduction Fluid Pump Outlet Port.

6793865

Note: This procedure cannot be performed if the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe
connector is contaminated with other forms of contaminants such as frame wax or dirt inside the connector, as
shown in the picture above. If this is the case, DO NOT perform the cleaning procedure as the Emission Reduction
Fluid Exhaust Front Pipe Injector Supply Pipe will need to be replaced.
1. Fill a clean container with fresh DEF.
2. Remove or pull back the heat protecting hood from the Emission Reduction Fluid Exhaust Front Pipe Injector
Supply Pipe connector end if present.
3. Fully disconnect the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe connector from the
Reductant Fluid Injector or the Emission Reduction Fluid Pump Outlet Port by following the Removal Procedure
outlined below (detach any clips or liners as needed for access). Wipe off any dust or dirt present on the outside
of the connector.

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January, 2025

Bulletin No.: PIE0811

6793867

4. Submerge the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe connector end into the
container filled with DEF, ensuring the open end of the connector is facing up, as shown in the picture above,
and hold for 1 min. Swash around the connector while it is submerged in DEF for another minute to dislodge
any crystals embedded inside the connector
5. Which side is the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe disconnected?
5.1.

For the Reductant Fluid Injector side: To clear any contamination within the connector interface command
the Control Function: Reductant Pump at 50% duty cycle, while the connector is still in the container, for a
time span of 5 to 10 seconds.

5.2. For the Emission Reduction Fluid Pump Outlet Port side: Proceed to the next step.
6. Inspect the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe connector end for any remaining
crystallization and repeat the steps above if needed.
7. With a clean rag, wipe off any crystallized DEF on the male pin of the Reductant Fluid Injector or the Emission
Reduction Fluid Pump Outlet Port.
8. Re-connect the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe connector to the Reductant
Fluid Injector or the Emission Reduction Fluid Pump Outlet Port as per the installation procedure outlined below
immediately to avoid re-crystallization. Re-install heat protecting hood if applicable.

Bulletin No.: PIE0811

January, 2025

Page 5

Removal Procedure

6793870

Depress the tab (3) while pushing the female side (1) towards male connector (2) and pull female side (1) straight
out to disconnect, as shown in the picture above.

Installation Procedure

6793888

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January, 2025

Bulletin No.: PIE0811

Push the Female Side (1) towards the male connector (2) all the way in, until an audible click is heard (if no audible
click is heard, pull on the female connector (1) outward to ensure retention). Some connectors may have a locking
tab that pops up, activate the locking tab by pressing down on the tab (3) (while keeping pressure towards the male
connector (2)). Once latched, pull on the female connector (1) outward to ensure connection is made, as shown in
the picture above.

Contact Information

The Contact Information has been redacted.
Please include the following information if leaving a message:
-

Technician name

-

Dealer name and phone number

-

Complete VIN and repair order (R.O) number

On the repair order, document the date and time the call was placed (even if the engineer was not reached).
If engineering is unable to return the call within one hour, proceed with diagnosis and repair based on information
found in SI.

Warranty Information
If an engineer was contacted or required information was provided, use:
Labor Operation

Description

Labor Time

4089408*

Engineering Information - Service Engine Soon, Service
Emission System, Service Exhaust Fluid System Message on
(DIC), DTCs Set

1.0 Hrs.

*This is a unique Labor Operation for bulletin use only.

Version

1

Modified

Released January 08, 2025

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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