Clicking Type Noise Heard Near Brake Pedal and/or I-Booster Under the Hood – 2017-2020 Chevrolet Bolt EV

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  Service Bulletin Bulletin No.: 20-NA-170 Date: May, 2021 TECHNICAL Subject: Clicking Type Noise Heard Near Brake Pedal and/or I-Booster Under the Hood Brand: Model: Model Year: Breakpoint: Engine: Transmission: from to from to Chevrolet Bolt EV 2017 2020 — — — — Involved Region or Country North America, Europe, GM Korea Company Condition Some customers may comment on a clicking noise heard near the brake pedal and/or I-booster under the hood. Cause The cause of this condition may be that the I-booster valves are at an idle position and making a rattle noise. Correction DO NOT replace the I-booster assembly. Update the Brake Booster Control Module with the latest software. Refer to Brake Booster Control Module: Programming and Setup in SI. 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. Note: 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 12V jumper or booster pack disconnected from the AC voltage supply. DO NOTconnect a battery charger. • Follow the on-screen prompts regarding ignition power mode, but ensure that anything that drains excessive power (exterior lights, HVAC blower motor, etc) is off. • Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/ Maintenance (I/M) system status indicators to NO. Caution: Be sure the VIN selected in the drop down menu (1) is the same as the vehicle connected (2) before beginning programming. Page 2 May, 2021 Bulletin No.: 20-NA-170 5743643 5644477 Bulletin No.: 20-NA-170 May, 2021 Page 3 5431207 Important: Techline Connect and TIS2WEB screens shown above. Important: If the same calibration/software warning is noted on the TLC or SPS Summary 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 Information section of this bulletin. Important: When programming a module in GM’s new Vehicle Intelligence Platform, or VIP, the power mode (ignition) needs to be off or errors may occur. This involves the 2020 Chevrolet Corvette, Cadillac CT5 and CT4, as well as the upcoming full-size Chevrolet, GMC, Cadillac SUVs and Buick Envision. Serial Data Message Authentication also needs to have the ignition off. 1. Reprogram the Brake Booster Control Module. Refer to K177 Brake Booster Control Module: Programming and Setup in SI. Page 4 May, 2021 Bulletin No.: 20-NA-170 5644478 5431209 Bulletin No.: 20-NA-170 May, 2021 Page 5 Note: The screenshots above are an example of module programming and may not be indicative of the specific module that is being programmed. Module selection and VIN information have been blacked out. Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the SPS Warranty Claim Code (WCC) screen shown above on the job card. Refer to callout 1 above for the location of the WCC on the SPS screen. 2. Record the SPS Warranty Claim Code on the job card for warranty transaction submission. Parts Information No parts are required for this repair. Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time 2811015 Brake Booster Control Module Reprogramming with SPS Use Published Labor Operation Time 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/SPS2. 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 TLC/TIS on the computer used to program the vehicle. 2. Select and start SPS/SPS2. 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 4 Modified Released August 28, 2020 September 02, 2020 – Updated the Correction, step 1 of the Service Procedure and Warranty Information. December 11, 2020 – Added the 2017-2018 Model Years and updated the Correction and Service Procedure. May 03, 2021 – Updated the Correction section and programming Service Procedure.
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