Information on Manual Regeneration Displayed on Drivers Information Center (DIC) – 2018-2023 Chevrolet Silverado & GMC Sierra

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Copyright 2022 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 20-NA-203 Date: September, 2022 INFORMATION Subject: Information on Manual Regeneration Displayed on Drivers Information Center (DIC) Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Silverado 2018 2018 L5P Silverado 2500/3500 2019 2023 GMC Sierra 2018 2018 Sierra 2500/3500 2019 2023 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. Page 2 September, 2022 Bulletin No.: 20-NA-203 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 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 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 September, 2022 Page 3 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 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. 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 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: • 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). Page 4 September, 2022 Bulletin No.: 20-NA-203 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. Performing a Manual Regeneration: 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. 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. Bulletin No.: 20-NA-203 September, 2022 Page 5 5654762 After making sure all the safety conditions have been met, press the trip odometer reset stem or the Check-Mark 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. 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. Page 6 September, 2022 Bulletin No.: 20-NA-203 5654694 When manual regeneration begins, the engine speed increases, the engine cooling fan sound increases and the message in the graphic above will be display. 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. 5654688 For vehicles equipped with FPF and NOT ANM, the message in the graphic above will be display when the regeneration process is finished. The message will remain when cleaning is not necessary. Bulletin No.: 20-NA-203 September, 2022 Page 7 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. 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. Page 8 September, 2022 Bulletin No.: 20-NA-203 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. Version 4 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. 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

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