# Service bulletin PIP5621C A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned. - Type: Service bulletin - NHTSA id: 10224285 - Published by NHTSA: 2022\-10\-17 - Manufacturer's number: PIP5621C - Manufacturer's date: 2022\-09\-14 - NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN ## NHTSA's summary This Preliminary information communicates to the dealer technician that TAC recommends the utilization of the GDS2 software to aid in diagnosing automatic transmission concerns. TAC is requesting the GDS2 session logs be sent in before the dealer contacts TAC. ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10224285-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10224285-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Transmission and driveline, Automatic transmission, Transmission control module ## Vehicles listed - 2016 to 2019 BUICK CASCADA - 2015 to 2022 BUICK ENCLAVE - 2015 to 2022 BUICK ENCORE - 2016 to 2022 BUICK ENVISION - 2015 to 2019 BUICK LACROSSE - 2015 to 2020 BUICK REGAL - 2015 to 2017 BUICK VERANO - 2015 to 2019 CADILLAC ATS - 2020 to 2022 CADILLAC CT4 - 2020 to 2022 CADILLAC CT5 - 2016 to 2020 CADILLAC CT6 - 2015 to 2019 CADILLAC CTS - 2015 to 2016 CADILLAC ELR - 2015 to 2020 CADILLAC ESCALADE - 2022 CADILLAC ESCALADE - 2016 CADILLAC ESCALADE ESV - 2018 to 2019 CADILLAC ESCALADE ESV - 2021 CADILLAC ESCALADE NA - 2015 to 2016 CADILLAC SRX - 2019 to 2022 CADILLAC XT4 - 2017 to 2022 CADILLAC XT5 - 2020 to 2022 CADILLAC XT6 - 2015 to 2019 CADILLAC XTS - 2019 to 2022 CHEVROLET BLAZER - 2017 to 2022 CHEVROLET BOLT EV - 2015 to 2022 CHEVROLET CAMARO - 2015 CHEVROLET CAPRICE - 2015 CHEVROLET CAPTIVA - 2015 to 2017 CHEVROLET CHEVEROLET SS - 2015 CHEVROLET CITY EXPRESS - 2015 to 2022 CHEVROLET COLORADO - 2015 to 2020 CHEVROLET CORVETTE - 2015 to 2019 CHEVROLET CRUZE - 2015 to 2022 CHEVROLET EQUINOX - 2015 to 2021 CHEVROLET EXPRESS - 2016 CHEVROLET EXPRESS 4500 - 2015 to 2020 CHEVROLET IMPALA - 2015 to 2022 CHEVROLET MALIBU - 2015 to 2022 CHEVROLET SILVERADO 1500 - 2015 to 2022 CHEVROLET SILVERADO 2500 - 2015 to 2022 CHEVROLET SILVERADO 3500 - 2015 to 2020 CHEVROLET SONIC - 2015 to 2021 CHEVROLET SPARK - 2015 to 2022 CHEVROLET SUBURBAN - 2015 to 2022 CHEVROLET TAHOE - 2019 CHEVROLET TRAILBLAZER - 2021 to 2022 CHEVROLET TRAILBLAZER - 2015 to 2022 CHEVROLET TRAVERSE - 2015 to 2022 CHEVROLET TRAX - 2015 to 2019 CHEVROLET VOLT - 2015 to 2022 GMC ACADIA - 2015 to 2022 GMC CANYON - 2015 to 2022 GMC SAVANA - 2015 to 2022 GMC SIERRA 1500 - 2015 to 2022 GMC SIERRA 2500 - 2015 to 2022 GMC SIERRA 3500 - 2015 to 2021 GMC TERRAIN - 2022 GMC TERRAIN NA - 2015 to 2022 GMC YUKON ## Recalls for the same vehicles and component - [26V085000](/recalls/nhtsa/26V085000.md), 2026-02-13: POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE - [26V083000](/recalls/nhtsa/26V083000.md), 2026-02-12: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY - [25V148000](/recalls/nhtsa/25V148000.md), 2025-03-06: POWER TRAIN:AUTOMATIC TRANSMISSION - [24V839000](/recalls/nhtsa/24V839000.md), 2024-11-07: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE - [24V797000](/recalls/nhtsa/24V797000.md), 2024-10-24: POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:VALVES/VALVE BODY; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE - [21V817000](/recalls/nhtsa/21V817000.md), 2021-10-18: POWER TRAIN:AUTOMATIC TRANSMISSION - [20V668000](/recalls/nhtsa/20V668000.md), 2020-10-29: POWER TRAIN:AUTOMATIC TRANSMISSION - [16V502000](/recalls/nhtsa/16V502000.md), 2016-07-05: ELECTRICAL SYSTEM:IGNITION; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\) - [14V152000](/recalls/nhtsa/14V152000.md), 2014-03-31: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES ## Other bulletins for the same vehicles and component - [PI0690B](/bulletins/10253608.md), 2024-04-29, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. MIL Illuminated. - [21\-NA\-245](/bulletins/10252775.md), 2024-04-05, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:PARK PAWL; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:WARNING; POWER TRAIN. This service bulletin provides repair information to correct a customer concern of seeing a Shift to Park Message Displayed in DIC. - [PIP5781A](/bulletins/10249958.md), 2024-02-12, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; COMMUNICATION; UNKNOWN OR OTHER. This Preliminary information communicates that characterizing certain parts is no longer required, the service instruction was changed but technicians are still trying to perform the function causing further confusion. - [14204](/bulletins/10248739.md), 2024-01-16, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER. Inner Tie Rod Torque - [14876](/bulletins/10247240.md), 2023-12-18, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:FLOOR SHIFT. 8\-speed Transmission Harsh Shift - [15NA045](/bulletins/10246520.md), 2023-12-11, Service bulletin: ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION. Rattle Noise Heard From Engine Bell Housing - [140730001B](/bulletins/10246502.md), 2023-12-11, Service bulletin: POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CLUTCHES/BANDS:ACTUATORS/SOLENOIDS; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts - [140730001](/bulletins/10246501.md), 2023-12-11, Service bulletin: UNKNOWN OR OTHER; POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CLUTCHES/BANDS:ACTUATORS/SOLENOIDS; VEHICLE SPEED CONTROL:THROTTLE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Information on Transmission Adaptive Functions - [PIP5944](/bulletins/10246022.md), 2023-12-04, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). This Preliminary Information communication advises the technician to determine if the incorrect part number TCM has been installed causing DTC P30D9 to set - [23\-NA\-102](/bulletins/10242125.md), 2023-09-09, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM:WIRING; ELECTRICAL SYSTEM; POWER TRAIN; ENGINE AND ENGINE COOLING. This service bulletin provides a procedure to repair wiring to correct customer concerns of Driveability, Hesitation, Transmission Shifting Rough/Harsh, Malfunction Indicator Lamp \(MIL\) Illuminated. 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