20NA055
Service Bulletin Details
Public Details for: 20NA055
This technical bulletin provides a procedure to program the ecm to correct the customers concern.
Models from 2020
2020 CHEVROLET EXPRESS |
2020 GMC SAVANA |
Models from 2019
Models from 2018
2018 CHEVROLET SILVERADO 1500 |
2018 CHEVROLET SUBURBAN |
2018 CHEVROLET TAHOE |
2018 GMC SIERRA 1500 |
2018 GMC YUKON |
Service Bulletin Bulletin No.: 20-NA-055 Date: May, 2020 TECHNICAL Subject: IPC Gauges Inoperative, numerous DIC Error Messages, No Brake or Electric Power Steering Assist, Transmission in Default Gear, No Reverse and/or Back Up Lights, No DRL, No Cruise or Adaptive Cruise and/or No Trailer Brake Lights Attention: This bulletin is ONLY applicable to the Models, Model Years, equipped with the RPO’s noted in the table below. Brand: Model: Cadillac Escalade Chevrolet Model Year: from to 2WD/4WD: Engine: Transmission: 2018 2019 All L86 All 2018 2018 2WD L83, L86, LV3 All Silverado 2018 2018 4WD L83, LV3 MYC 2018 2018 4WD L86 M5U Silverado LD 2019 2019 All L83, LV3 All Suburban 2018 2019 All L83, L86 All Tahoe 2018 2019 All L83, L86 All 2018 2018 2WD L83, L86, LV3 All 2018 2018 4WD L83, LV3 MYC Sierra 2018 2018 4WD L86 M5U Sierra Limited 2019 2019 All L83, LV3 All Yukon 2018 2019 All L83, L86 All GMC Involved Region or Country North America, Middle East, Israel, Chile, Columbia, Ecuador, Paraguay, Peru, Uruguay and Thailand. Condition Some customers may comment on one or more of the following two fault conditions: 1. Aborted Crank: – Vehicle begins to crank, stops cranking and then has a successful start 2. CAN Lockup: • IPC gauges inoperative • Numerous DIC error messages • Oil pressure gauge reads zero • Coolant temperature gauge reads zero • Speedometer gauge reads zero • Tachometer gauge reads zero • Engine appears to be operating in a reduce power mode • No brake assist • Possible no electric power steering assist • Transmission in default gear • No reverse gear and/or no back-up lights • Fuel and battery gauges are correct • No reverse gear and/or no back-up lights • DRL inoperative Copyright 2020 General Motors LLC. All Rights Reserved. Page 2 May, 2020 Bulletin No.: 20-NA-055 • Numerous DIC error messages displayed Note: Headlights can be manually turned On. • • • • Auto headlights inoperative The parking lights and LED strip are On The center-stack and radio will be operational When the engine is stopped and the HSLAN bus goes to sleep, fault condition is cleared. Some customers may also comment that the vehicle begins to crank, stops cranking and then has a successful start. Note: U0100 alone is not a good indication of this issue. A better indication of the condition are the symptoms listed above. If vehicle is left in this condition for an extended period, some technicians may find U0100 (Lost Communication With Engine Control Module) set. Some technicians may also find when the engine is stopped and the HSLAN bus goes to sleep, the fault condition is cleared. Cause This condition may be caused by a software anomaly. Correction If you encounter a vehicle with any of the above conditions, reprogram the Engine Control Module (ECM) with the latest available software. Service Procedure Caution: Before downloading the update files, be sure the computer is connected to the internet through a network cable (hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming, programming failure or control module damage may occur. Important: Carefully read and follow the instructions below. • Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur. • Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to www.gmdesolutions.com for further information. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger. • Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights (including daytime running lights), HVAC, radio, etc. • Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/ Maintenance (I/M) system status indicators to NO. Bulletin No.: 20-NA-055 May, 2020 Page 3 5431207 Important: TIS2WEB screen shown. Techline Connect screen is similar and will be included soon. Important: If the Same Calibration/Software Warning is noted on the SPS screen, select OK and follow screen instructions. After a successful programming event, the WCC is located in the Service Programming System dialogue box of the SPS Summary screen. No further action is required. Refer to the Warranty section of the bulletin. 1. Reprogram the ECM module. Refer to K20 Engine Control Module: Programming and Setup in SI. Modify as required (e.g., select x module from the controller screen. Then provide step-by-step instructions or refer to SI procedure. Page 4 May, 2020 Bulletin No.: 20-NA-055 5431209 Important: TIS2WEB screen shown. Techline Connect screen is similar and will be included soon. Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the SPS Warranty Claim Code (WCC) screen on the job card. Refer to callout 1 above for the location of the WCC on the SPS screen 2. Record SPS Warranty Claim Code on job card for warranty transaction submission. Bulletin No.: 20-NA-055 May, 2020 Page 5 Parts Information No parts are required for this repair. Warranty Information 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 2886718* Engine Control Module Reprogramming with SPS for Loss of Communication to ECM 0.5 hr *This is a unique Labor Operation for Bulletin use only. Important: **To avoid warranty transaction rejections, carefully read and follow the instructions below: • The SPS Warranty Claim Code must be accurately entered in the “SPS Warranty Claim Code” field of the transaction. • When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the “SPS Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by SPS. Warranty Claim Code Information Retrieval If the SPS Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows: 1. Open TIS on the computer used to program the vehicle. 2. Select and start SPS. 3. Select Settings. 4. Select the Warranty Claim Code tab. The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code field. Version 1 Modified Released May 04, 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION