Subject:

Engineering Information - Disconnected Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe, DTCs
P249C, P20E8 Set

Attention:

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.

This EI has been revised to update information under the Correction. Please discard PIE0665.
Brand:

Model:

Chevrolet

GMC

Model Year:

VIN:

from

to

from

to

Silverado 1500

2020

2021

-

-

Silverado 1500 (New Model)

2022

2022

Silverado 2500HD/3500HD

2020

Sierra 1500

2020

2021

Sierra 1500 (New Model)

2022

2022

Sierra 2500HD/3500HD

2020

Engine:

Transmission
:

Equipped with 3.0L
(RPO LM2)

-

Equipped with 6.6L
(RPO L5P)
Equipped with 3.0L
(RPO LM2)

Equipped with 6.6L
(RPOs L5P)

Involved Region or Country

North America

Condition

Important: If the customer did not bring their vehicle in for this concern, DO NOT proceed with this EI.
Customers may comment on Service Engine Soon (SES) Lamp illuminated and/or “Service Emissions System”
message on the Driver Information Center (DIC).
Technicians may find the following DTCs set.

•

DTC P249C - Excessive Time To Enter Closed Loop Reductant Injection Control

•

DTC P20E8 - Reductant Low Pressure

Note: If DTC P249C and/or P20E8 have set during the Tamper Service Bay Test, after installing a new Emission
Reduction Fluid Pump/Tank, please refer to bulletin 20-NA-110.
This condition may be related to a disconnected Emission Reduction Fluid Exhaust Front Pipe Injector Supply
Pipe.

Cause

Correction
If you encounter a vehicle set with DTC P249C and/or P20E8 currently active (displaying the “Service Emission System” message and SES Lamp illuminated) or in
history (SES Lamp illuminated or not illuminated), contact the engineers listed BEFORE proceeding with the following steps:
1.

Perform a Reductant System Leak Test. Does the test pass?
1.1.

If yes, contact the engineer listed below for the next steps.

1.2.

If no, is there a leak at the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe or at the connection to the Reductant Fluid Injector or the
Emission Reduction Fluid Pump Outlet Port?

Note: Please submit a Field Product Report, capturing a picture of the DEF crystallization buildup at the connection interface. (Canadian dealers please send
picture via email to (email redacted) and please include the following information shown below if leaving a message).
– Technician name

1

– Dealer name and phone number
– Complete VIN and repair order (R.O) number
– Vehicle mileage
1.2.1. If no, contact the engineer listed below for the next steps.

1.2.2. If yes, is the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe or the connector damaged in any
way, as shown in the pictures above.
1.2.3. If yes, replace the Emission Reduction Fluid Exhaust Front Pipe Injector Supply Pipe, perform a Reductant System Tamper
Service Bay Test and release the vehicle back to the customer.
1.2.4. If no, follow the Cleaning Procedure outlined below and perform a Reductant System Tamper Service Bay Test, does the test
pass?
1.2.5. If yes, release the vehicle back to the customer.
1.2.6. If no, contact the engineer listed below.

Cleaning Procedure

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.

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 pictures 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.

2

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.

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.

5.2.

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.

Removal Procedure

Depress the tab (3) while pushing the female side (1) towards male connector (2) and pull female side (1) straight out to disconnect.

Installation Procedure

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.

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

–

Vehicle Mileage

On the repair order, document the date and time the call was placed (even if the engineer was not reached).

3

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 engineer was contacted or required information was provided, use:
Labor Operation

Description

Labor Time

4088238*

Engineering Information - Disconnected Emission Reduction Fluid Exhaust
Front Pipe Injector Supply Pipe, DTCs P249C, P20E8 Set

1.0 hr

Version

2

Modified

Released October 25, 2021
Revised June 02, 2022 – Revised to update information under the Correction.

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