# Service bulletin PIP5621A 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: 10168978 - Published by NHTSA: 2019\-12\-09 - Manufacturer's number: PIP5621A - Manufacturer's date: 2019\-11\-22 - NHTSA component: 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/2019/MC-10168978-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10168978-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Transmission and driveline ## Vehicles listed - 2016 to 2018 BUICK CASCADA - 2015 to 2018 BUICK ENCLAVE - 2015 to 2018 BUICK ENCORE - 2016 to 2018 BUICK ENVISION - 2015 to 2018 BUICK LACROSSE - 2015 to 2018 BUICK REGAL - 2015 to 2017 BUICK VERANO - 2015 to 2018 CADILLAC ATS - 2016 to 2018 CADILLAC CT6 - 2015 to 2018 CADILLAC CTS - 2015 to 2017 CADILLAC ELR - 2015 to 2018 CADILLAC ESCALADE - 2015 to 2016 CADILLAC ESCALADE ESV - 2017 to 2018 CADILLAC ESCALADE ESV - 2015 to 2016 CADILLAC SRX - 2017 to 2018 CADILLAC XT5 - 2015 to 2018 CADILLAC XTS - 2016 CHEVROLET 3500 - 2015 to 2018 CHEVROLET AVEO - 2017 to 2018 CHEVROLET BOLT EV - 2015 to 2018 CHEVROLET CAMARO - 2015 to 2017 CHEVROLET CAPRICE - 2015 to 2018 CHEVROLET CAPTIVA - 2015 to 2017 CHEVROLET CHEVEROLET SS - 2017 CHEVROLET CHEYENNE - 2015 to 2016 CHEVROLET CITY EXPRESS - 2015 to 2018 CHEVROLET COLORADO - 2015 to 2018 CHEVROLET CORVETTE - 2015 to 2018 CHEVROLET CRUZE - 2015 to 2018 CHEVROLET EQUINOX - 2015 to 2018 CHEVROLET EXPRESS - 2015 to 2018 CHEVROLET IMPALA - 2017 to 2018 CHEVROLET LOW CAB FORWARD 4500 - 2017 to 2018 CHEVROLET LOW CAB FORWARD 5500 - 2015 to 2018 CHEVROLET MALIBU - 2015 to 2016 CHEVROLET N300 - 2018 CHEVROLET N300 - 2017 CHEVROLET N300 MAX - 2017 CHEVROLET ORLANDO - 2016 to 2018 CHEVROLET S10 - 2017 CHEVROLET SILVERADO - 2018 CHEVROLET SILVERADO 1500 - 2015 to 2016 CHEVROLET SILVERADO 2500 - 2018 CHEVROLET SILVERADO 2500 - 2017 CHEVROLET SILVERADO 3500 - 2015 to 2018 CHEVROLET SONIC - 2015 to 2018 CHEVROLET SPARK - 2015 to 2017 CHEVROLET SPARK EV - 2015 to 2018 CHEVROLET SUBURBAN - 2015 to 2018 CHEVROLET TAHOE - 2017 to 2018 CHEVROLET TRAILBLAZER - 2015 to 2018 CHEVROLET TRAVERSE - 2015 to 2018 CHEVROLET TRAX - 2015 to 2018 CHEVROLET VOLT - 2015 to 2018 GMC ACADIA - 2015 to 2018 GMC CANYON - 2015 to 2018 GMC SAVANA - 2017 GMC SIERRA - 2015 to 2016 GMC SIERRA 2500 - 2018 GMC SIERRA 2500 - 2015 to 2016 GMC SIERRA DENALI - 2018 GMC SIERRA DENALI - 2015 to 2018 GMC TERRAIN - 2015 to 2018 GMC YUKON - 2015 to 2018 GMC YUKON XL ## Recalls for the same vehicles and component - [26V289000](/recalls/nhtsa/26V289000.md), 2026-05-07: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\) - [2020520](/recalls/tc/2020520.md), 2020-10-29: Powertrain - [20V668000](/recalls/nhtsa/20V668000.md), 2020-10-29: POWER TRAIN:AUTOMATIC TRANSMISSION - [2020020](/recalls/tc/2020020.md), 2020-01-23: Powertrain - [20V038000](/recalls/nhtsa/20V038000.md), 2020-01-23: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT - [17V516000](/recalls/nhtsa/17V516000.md), 2017-08-22: POWER TRAIN:DRIVELINE:DRIVESHAFT - [16V502000](/recalls/nhtsa/16V502000.md), 2016-07-05: ELECTRICAL SYSTEM:IGNITION; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\) - [2016341](/recalls/tc/2016341.md), 2016-06-30: Powertrain - [14V819000](/recalls/nhtsa/14V819000.md), 2014-12-24: POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT - [2014589](/recalls/tc/2014589.md), 2014-12-22: Powertrain ## Other bulletins for the same vehicles and component - [PI0281L](/bulletins/11019516.md), 2025-06-12, Service bulletin: STEERING; POWER TRAIN; SUSPENSION. This preliminary informational \(PI\) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers. - [PIP5966A](/bulletins/11014622.md), 2025-03-02, Service bulletin: POWER TRAIN. This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement - [PIP5966A](/bulletins/11014621.md), 2025-03-02, Service bulletin: POWER TRAIN. This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement - [16\-NA\-019](/bulletins/11014353.md), 2025-02-19, Service bulletin: POWER TRAIN. This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares. - [PIP5175F](/bulletins/11014044.md), 2025-02-10, Service bulletin: POWER TRAIN. This Preliminary Information communication provides information to the technician about vehicles that may have a delayed engagement into drive, shudder at a launch, or the transmission is slipping when shifting into 1st, 2nd, 3rd or 4th gears. This may be due to loose stator support to pump cover bolts causing a leak at the stator support to pump cover gasket. Technician will check for the bolts to be loose. If any of the bolts are loose or the gasket is misaligned or leaking, the transmission pump cover must be replaced and the 1234 clutch plates should be inspected for being distressed and repaired as needed. - [09\-06\-04\-026Z](/bulletins/11013069.md), 2025-01-23, Service bulletin: ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides information on identifying Non\-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2. - [PIC6454A](/bulletins/11012951.md), 2025-01-20, Service bulletin: POWER TRAIN. This Preliminary Information communicates additional information to the customer on the "No Lift Shift" feature found on all Manual Transmission equipped Camaros. - [08\-07\-30\-035I](/bulletins/11011989.md), 2024-12-19, Service bulletin: POWER TRAIN. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid. - [21\-NA\-181](/bulletins/11011904.md), 2024-12-18, Service bulletin: POWER TRAIN. This service bulletin provides 9th gear operation information to respond to customers that may comment on transmission shift operation. - [PIP6014](/bulletins/11011436.md), 2024-12-05, Service bulletin: POWER TRAIN. This Preliminary information communicates for Technicians installing a Service Replacement Transmission Assembly to contact Technical Assistance to make sure unit is not suspect of a snap ring concern prior to installation. 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