Possible Crank No Start or Extended Crank with DTC P12A6 – 2019-2021 Buick Cadillac Chevrolet GMC

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Service Bulletin Bulletin No.: 20-NA-218 Date: May, 2021 TECHNICAL Subject: Possible Crank No Start or Extended Crank with DTC P12A6 Brand: Model: Model Year: Breakpoint Date: Engine: Transmission: from to from to Buick Encore GX 2020 2021 SOP March 6, 2021 1.2L (LIH) — Regal 2019 2020 — — 1.5L (LFV) Cadillac CT5 2020 2020 — — 3.0L (LGY) Escalade 2021 2021 SOP November 4, 2020 5.3L (L84), Escalade ESV 6.2L (L87) Chevrolet Camaro 2021 2021 SOP February 15, 2021 2.0L (LTG) Corvette 2020 2020 — — 6.2L (LT2) Equinox 2020 2021 SOP January 14, 2021 1.5L (LYX) Malibu 2019 2021 SOP January 15, 2021 1.5L (LFV) 2021 2.0L (LTG) Silverado 1500 (New Model) 2019 2019 — — LV3, L82, L84, L87. Silverado 1500 2020 2021 SOP February 11, 2021 4.3 (LV3) 5.3 (L82, L84) 6.2 (L87) Silverado 2500HD/3500HD 2020 2021 SOP February 11, 2021 6.6 (L8T) Suburban 2021 2021 SOP November 4, 2020 5.3L (L84), Tahoe 6.2L (L87) Trailblazer (VIN M) 2020 2021 SOP March 6, 2021 1.2L (LIH) GMC Sierra 1500 (New Model) 2019 2019 — — LV3, L82, L84, L87. Sierra 1500 2020 2021 SOP February 11, 2021 4.3 (LV3) 5.3 (L82, L84) 6.2 (L87) Sierra 2500HD/3500HD 2020 2021 SOP February 11, 2021 6.6 (L8T) Terrain 2020 2021 SOP January 14, 2021 1.5L (LYX) Yukon 2021 2021 SOP November 4, 2020 5.3L (L84), Yukon XL 6.2L (L87) Page 2 May, 2021 Bulletin No.: 20-NA-218 Involved Region or Country North America, Europe, Uzbekistan, Russia, Middle East, Palestine, Israel, Brazil, Chile, Paraguay, Colombia, Ecuador, Peru, Uruguay, Argentina, Japan, Thailand, GM Korea Company, Cadillac Korea (South Korea), Australia/New Zealand, Egypt, other Africa Condition Some customers may comment on a possible crank no start or extended crank. Technicians may find DTC P12A6 set current or in recent history. This could be accompanied with a crank no start or extended crank issue and additional DTCs P00C6, P00F4, P0098, P2199 and/or P0096. Cause The cause of the condition may be a software anomaly in the Engine Control Module (ECM). Correction Reprogram the ECM. 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. • 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. • Please verify that the radio time and date are set correctly before inserting USB drive into vehicle for programming, otherwise an error will result. • 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. Bulletin No.: 20-NA-218 May, 2021 Page 3 5743643 5644477 Page 4 May, 2021 Bulletin No.: 20-NA-218 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 Engine Control Module (ECM). Refer to K20 Engine Control Module: Programming and Setup in SI. Bulletin No.: 20-NA-218 May, 2021 Page 5 5644478 5431209 Page 6 May, 2021 Bulletin No.: 20-NA-218 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. Warranty Information Important: Warranty coverage code E2 applies for this module programming event. ECM reprogramming is covered for 8 years/80,000 miles (U.S.) or 8 years/ 130,000 km (Canada). 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 2887038* Engine Control Module Reprogramming for Crank No Start or Extended Crank Condition 0.3 hr Labor Operation Description Labor Time *This is a unique Labor Operation for bulletin use only. Important: To avoid warranty transaction rejections, carefully read and follow the instructions below: • The 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. Bulletin No.: 20-NA-218 May, 2021 Page 7 Version 10 Modified Released November 17, 2020 December 18, 2020 – Added 2020 Truck Models and updated programming information in the Service Procedure. January 15, 2021 – Added the 2020 Chevrolet Corvette and North America to the Involved Region or Country section. February 08, 2021 – Added 2020 Cadillac CT5, 2019 Chevrolet Silverado 1500 and GMC Sierra 1500 and engine RPOs. February 23, 2021 – Added the 2021 Model Year to Chevrolet Silverado 1500, 2500HD/ 3500HD and GMC Sierra 1500, 2500HD/3500HD with Breakpoint dates, updated the Condition section with additional DTCs and updated the Involved Region or Country section. March 08, 2021 – Added 2021 Buick Encore GX and Chevrolet Trailblazer (VIN M) with breakpoints. March 19, 2021 – Added 2020 Buick Encore GX and Chevrolet Trailblazer (VIN M) and updated the programming template. April 05, 2021 – Added 2020 and 2021 Chevrolet Equinox and GMC Terrain and added Brazil to Involved Region or Country section. April 23, 2021 – Added the Buick Regal and Chevrolet Malibu models, updated the Involved Region or Country section and updated the programming bullet points under Service Procedure. May 07, 2021 – Added the Chevrolet Camaro and the 2021 Malibu with LTG engine.
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