20-NA-203 Service Bulletin/Repair Instructions

Bulletin No.: 20-NA-203
Service Bulletin
Date: July, 2024
INFORMATION

Subject:
Brand:
Information on Manual Regeneration Displayed on Drivers Information

Center (DIC)
Model:
from
to
2018
2018
Silverado 4500HD/

5500HD/6500HD
2019
2025
Sierra
2018
2018
Sierra 2500/3500
2019
2025
Silverado

Chevrolet
GMC
Model Year:
VIN:

from
Engine:
Transmission:
to
Silverado 2500/3500

L5P, L5D
Involved Region or Country
North America, Middle East, Israel, Palestine
Condition
Some customers may comment that messages on the Drivers Information Center (DIC)

are related to manual regeneration operation.
Additional Options (RPOs)
Manual regeneration (FPF)

Emergency vehicle calibration (ANM)
Cause
This condition may be caused by a vehicle with a DPF, requiring periodic regenerations.

- Due to the usage requirements of some fleet vehicles and emergency vehicles, it may

be difficult for the vehicle to perform an automatic regeneration.
Correction
The use of the Manual Regeneration function when prompted or on a regular basis will

reduce the chance of a vehicle having regeneration issues. This communication

describes how this function works.
Information

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.

Messages Displayed on DIC

• First Level - Message
Copyright 2024 General Motors. All Rights Reserved.
Page 2
July, 2024
5654544
At approximately 90% soot load in the DPF, one of the

messages in the graphic above will be displayed on the

DIC.

These messages indicate that Manual Regeneration is

available. No action is required; however, the operator

may choose to perform a manual regeneration. See

performing a manual regeneration below. If the

message is dismissed and the vehicle has not

performed a regeneration, this message will appear

again on the next key on cycle.

• Second Level - No Message

If the manual regeneration option was not performed

and the soot level climbs to 100%. there will be no

additional DIC message. However, the vehicle will try to

start an automatic regeneration. Once all conditions are

met for running the regeneration, the vehicle will start

the process. If this regeneration is interrupted or the

vehicle is turned off, on the next key cycle, the vehicle

will try to continue the regeneration once conditions

again become right. This will continue until the regeneration is complete.

• Third Level - Message
Bulletin No.: 20-NA-203
5654545
If the soot level climbs to a level near 110 - 115% in the

DPF while the vehicle is moving and the vehicle is still

not able to start an automatic regeneration, the

message in the graphic above will display.

If the message is displayed, continue driving safely at a

steady speed as close to the posted speed limit as

possible until the message turns off. This can take up

to 30 minutes.
Bulletin No.: 20-NA-203
July, 2024
Page 3
5654703
If the soot level climbs to a level near 130% in the DPF

while the vehicle is moving and the vehicle is still not

able to start a regeneration, the message in the graphic

above is displayed.
5654544
If the vehicle is shifted to park, one of the messages in

the graphic above will appear.

These messages indicate that Manual Regeneration is

available.

⇒
Refer to Performing a Manual Regeneration below.
• Fourth Level - Message
If the vehicle is placed into park, the above message

will not change and there will not be an opportunity to

perform a manual regeneration. The vehicle must be

driven to initiate an automatic regeneration. Continue

driving safely at a steady speed as close to the posted

speed limit as possible, until the message turns off.

This can take up to 30 minutes.

• Fifth Level - Message

When the soot level in the DPF reaches about 140%,

the vehicle will no longer attempt to perform a regeneration. The vehicle is put into reduced power and the

SES light is illuminated to give the driver as much

mileage as possible until the filter is completely

plugged. If the vehicle is driven in reduced power long

enough, the filter can become so plugged that the

engine will not be able to run anymore.

Requirements for Performing a Manual

Regeneration:

Warning: During DPF self-cleaning or during

extended idling in P (Park), the exhaust system and

exhaust gases are very hot. Things that burn could

touch hot exhaust parts under the vehicle and

ignite. You or others could be burned. Do not park,

or idle for an extended period of time, near or over

papers, leaves, dry grass, or other things that can

burn. Keep the exhaust area clear of material that

could ignite or burn.

Caution: Extended idle should be avoided because the

DPF system is not capable of self-cleaning at idle.

During extended idle operation, monitor the instrument
Page 4
July, 2024
cluster telltale lights and Driver Information Center for

messages and take appropriate indicated action.

Continued idling with the warning light/message on

could cause irreversible damage to the DPF requiring

repair and possible replacement that might not be

covered by the vehicle warranty.

Before starting the manual regeneration, make sure all

of the following safety conditions are met:
Bulletin No.: 20-NA-203
Performing a Manual Regeneration:
• The vehicle is parked on level ground, away from

any flammable materials.

• The vehicle is parked outdoors, away from any

walls or buildings.

• The vehicle is at least 3 m (10 ft) from any obstructions or materials that may combust or melt.

• The shift lever is in P (Park).

• The fuel tank is at least one-eighth full.

• All fluids are at the proper level.

• No diagnostic trouble codes have been set, and

the malfunction indicator lamp is not on.

• The engine coolant temperature is above 71 °C

(160 °F).

Note: If your truck is equipped with RPO PTO see

www.gmupfitter.com Bulletin 120 for additional detail.

After making sure all the safety conditions have been

met, press the trip odometer reset stem or √ on the

steering wheel control for at least one second to select

‘Start’ on the DIC.

5654593
If the vehicle is being driven and the message in the

graphic above is displayed, the operator may choose to

stop the vehicle to perform a manual regeneration.

⇒
Please be sure to note and locate the vehicle in

accordance with the warning and safety conditions

listed above.
Bulletin No.: 20-NA-203
July, 2024
Page 5
After making sure all the safety conditions have been

met, press the trip odometer reset stem or the

CheckMark on the steering wheel control for at least

one second to select Start on the DIC. The DIC will

display in the graphic above.

Follow the instructions in the DIC messages. Select

Yes or Accept to acknowledge that all the safety conditions have been met and to activate regeneration.

If the DIC returns to the previous screen, then one or

more of the necessary operating conditions has not

been met. If you cannot determine which condition has

not been met, refer to www.gmupfitter.com to contact

the GM Upfitter Integration Group for assistance.
5654712
When shifting to park, scroll through the DIC pages to

find the Exhaust Cleaning menu. Depending on

whether the vehicle has a base or up level cluster, it

may be under the Settings menu. The DIC will display a

reference to refer to the Owners Manual as shown in

the graphic above.
5654697
If all requirements for the manual regeneration are met,

the DIC will display to Press and Hold Exhaust Brake

Switch to Begin as shown in the graphic above.

Hold the exhaust brake switch on the center stack

below the climate controls for more than three seconds,

and then release it, to begin the regeneration process.

If the EXHAUST BRAKE ON message displays, then

the switch was released too soon. Press it again to turn

off the exhaust brake, then try again when the DIC

message prompts.

5654762
Page 6
July, 2024
Bulletin No.: 20-NA-203
5654694
5654688
When manual regeneration begins, the engine speed

increases, the engine cooling fan sound increases and

the message in the graphic above will be display.
For vehicles equipped with FPF and NOT ANM, the

message in the graphic above will be display when the

regeneration process is finished.
Warning: Do not leave the vehicle unattended

during the Manual Regeneration.

Cleaning could take up to 30 minutes. Upon

completion, the engine will return to normal idle, but

exhaust components will remain hot for

several minutes. Do not move the vehicle until the

exhaust has had time to cool. Manual regeneration can

be canceled at any time by pressing the brake pedal or

turning the engine off. Unusual noises may be heard if

regeneration is interrupted.
The message will remain when cleaning is not

necessary.
Bulletin No.: 20-NA-203
July, 2024
Page 7
It may be useful to develop a schedule to perform a

manual regeneration at a certain interval to reduce the

possibility of having a regeneration issue while the

vehicle is in use. If the vehicle is used in roughly the

same conditions each day, it may be useful to use the

table below to collect data to be able to develop an

interval for performing manual regenerations. Record

the information below whenever the First level

message (90% soot load) is displayed.

Date
Mileage
Total Engine

Hours
Comments

on the drive

(Extra idle

time, Drove

on long trip,

…)
Parts Information

No parts are required for this repair.
5654666
For vehicles equipped with FPF AND ANM, the

message in the graphic above will be display.

If a manual regen was just performed, the presence of

this message is not an indication that the vehicle needs

another regeneration. The DPF is clean. This is

displayed because manual regeneration can only be

initiated if the above message is displayed. Since a

vehicle with ANM is permitted to perform a regeneration at any soot level in the DPF, once the regeneration is complete, the above message needs to be

displayed. Provided that the engine idled up, the

exhaust sound changed and/or there was a different

smell from the exhaust, be assured that there is a very

low soot level in the DPF when this message

reappears.

Version
6
Modified
Released October 07, 2020

Revised January 05, 2021 - Added 2021 to Model Year.

Revised January 7, 2022 - Added 2022 to Model Year.

Revised September 12, 2022 - Added 2023 to Model Year and Important Statement.

Revised January 25, 2023 - Added 4500HD/5500HD, 6500HD and RPO L5D.

Revised July 16, 2024 - Added 2024 and 2025 to Model Year.
Additional Keywords: DPF, DEF, Diesel Particulate

Filter, Diesel Exhaust Fluid
Page 8
July, 2024
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.
Bulletin No.: 20-NA-203
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