Technical Service Bulletins (TSB)

BUICK — ACADIA, BLAZER, CT4, CT5, CT6, ENCORE GX, ENVISION, SIERRA 1500, SIERRA 2500, SILVERADO 1500, SILVERADO 2500, TRAILBLAZER, XT4, XT5, XT6 (2019–2021) — 26 vehicle combinations

061700 ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR

This Preliminary information communicates to the technician a service Diagnostic / Repair tip to avoid causing the crankshaft sprocket to disengage from the crankshaft during crankshaft balancer removal.

BUICK — ACADIA, ATS, BLAZER, CAMARO, CANYON, COLORADO, CT5, CT6, CTS, LACROSSE, REGAL, XT5, XT6 (2016–2021) — 104 vehicle combinations

060000 ENGINE (PWS)

This Preliminary information communicates additional diagnostic information for DTC's P0016 and P0018.

BUICK — ENCORE GX, TRAILBLAZER (2020–2021) — 2 vehicle combinations

350000 EQUIPMENT

This service bulletin provides repair information to correct a customer concern of Volume Level Difference When Switching Between FM and Sirius XM Audio Sources.

BUICK — 3500, 4500HD, 4500XD, 5500HD, ACADIA, ATS, AVALANCHE, AVEO, BLAZER, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CITY EXPRESS, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DTS, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, HHR, IMPALA, LACROSSE, LOW CAB FORWARD 6500, LUCERNE, MALIBU, N300, N300 MAX, REGAL, S10, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SONIC, SPARK, SPARK EV, SRX, SS, STS, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VOLT, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2011–2021) — 454 vehicle combinations

350000 EQUIPMENT

This informational bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before sold (prepping) to the customer.

BUICK — ACADIA, BLAZER, ENCLAVE, TRAVERSE, XT5, XT6 (2021) — 6 vehicle combinations

280000 BACK OVER PREVENTION

This Preliminary information communicates that a dealer may encounter a vehicle that is making a grinding or growling noise on the first few brake applications after the vehicle has been sitting overnight. The dealer is instructed to perfor

BUICK — ENVISION (2021) — 2 vehicle combinations

100000 POWER TRAIN

This preliminary information addresses a potential issue where the battery may become discharged if vehicle battery is disconnected before the Transmission Module has gone to sleep.

BUICK — ACADIA, BLAZER, ENCLAVE, TRAVERSE, XT5, XT6 (2017–2021) — 23 vehicle combinations

280000 BACK OVER PREVENTION

This Preliminary information communicates noise condition that has been identified and the repair that is in process. A special Labor Operation was added for tracking purposes only. All models associated with the in process repair have bee

BUICK — CORVETTE, CT4, CT5, ENVISION, ESCALADE ESV, SUBURBAN, TAHOE, YUKON XL (2020–2021) — 11 vehicle combinations

110000 ELECTRICAL SYSTEM

This Preliminary information communicates and issue with a SES MIL and the BCM keeping the ignition main relay on after the vehicle is turned off. Dealers are to replace the BCM.

BUICK — ACADIA, ENCLAVE, SIERRA 1500, SILVERADO 1500, TRAVERSE (2020–2021) — 10 vehicle combinations

110000 ELECTRICAL SYSTEM

This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Loss of Power, Instrument Panel Cluster (IPC) Gauges are Inoperative and/or Fluctu

BUICK — ENVISION (2021)

110000 ELECTRICAL SYSTEM

This preliminary information is to explain a condition where a low battery or battery disconnect may cause an false SES MIL.

BUICK — ENCORE GX, EQUINOX, ESCALADE, MALIBU, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, YUKON (2020–2021) — 12 vehicle combinations

100000 POWER TRAIN

This Preliminary information communicates Possible Crank no start or extended crank with DTC p12A6 set current or history. Under Investigation

BUICK — ENCORE GX (2021) — 3 vehicle combinations

100000 POWER TRAIN

Service Update. On certain vehicles equipped with automatic transmissions, the clutch spring retaining ring may not be fully seated. Vehicles with this condition may set DTC Code P0747 and the MIL light (malfunction indicator light) will

BUICK — CORVETTE, CT4, CT5, ENVISION, ESCALADE, SUBURBAN, TAHOE, YUKON (2020–2021) — 22 vehicle combinations

110000 ELECTRICAL SYSTEM

This Preliminary information communicates a parts restriction is in place for the Body Control Module on 2020 Cadillac CT4, CT5, Chevrolet Corvette, Suburban, Tahoe and GMC Yukon.

BUICK — ENCLAVE, TRAVERSE (2021) — 2 vehicle combinations

351420 EQUIPMENT:RECREATIONAL VEHICLE/TRAILER:MATERIALS:FLOORING

Customer Satisfaction Program - Certain 2021 model year Buick Enclave and Chevrolet Traverse vehicles were delivered without floor mats. Dealers will install standard floor mats.

BUICK — ENCLAVE, TRAVERSE (2021) — 2 vehicle combinations

160000 STRUCTURE

Customer Satisfaction - Certain 2021 model year Buick Enclave and Chevrolet Traverse vehicles do not have the accessory all-weather floor mats that were invoiced for the vehicle. Dealer will install floor mats.

BUICK — 3500, 4500HD, 5500HD, 9-3, 9-5, 9-7X, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BLAZER, BOLT EV, C SERIES, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DTS, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, ENVOY, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G VAN BUS, G3, G5, G6, G8, GRAND PRIX, GTO, H2, H3, HHR, IMPALA, ION, LACROSSE, LOW CAB 4500, LOW CAB 5500, LOW CAB FORWARD 6500, LUCERNE, MALIBU, MONTANA, MONTE CARLO, N300, N300 MAX, ORLANDO, OUTLOOK, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SKY, SOLSTICE, SONIC, SPARK, SPARK EV, SRX, SS, STS, SUBURBAN, T SERIES, TAHOE, TERRAIN, TERRAZA, TOPKICK, TORRENT, TRAILBLAZER, TRAVERSE, TRAX, UPLANDER, VERANO, VIBE, VOLT, VUE, W-SERIES, XLR, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2007–2021) — 2097 vehicle combinations

021300 SUSPENSION:FRONT:SHOCK ABSORBER

This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.

BUICK — ACADIA, ATS, AVALANCHE, AVEO, BLAZER, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CHEYENNE, CITY EXPRESS, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, IMPALA, LACROSSE, LUCERNE, MALIBU, N300, N300 MAX, ORLANDO, REGAL, S10, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 4500HD, SONIC, SPARK, SPARK EV, SRX, SS, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VOLT, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2012–2021) — 1287 vehicle combinations

160000 STRUCTURE

This service bulletin provides information for dealers/technicians on accessory all-weather floor liners and flat mats warped or misshapen.

BUICK — ACADIA, BLAZER, BOLT EV, CAMARO, COLORADO, CORVETTE, CT4, CT5, CT6, ENCLAVE, EQUINOX, MALIBU, SIERRA 1500, SIERRA 2500, SILVERADO 1500, SILVERADO 2500, SPARK, TERRAIN, TRAVERSE, XT4, XT5, XT6 (2020) — 44 vehicle combinations

110000 ELECTRICAL SYSTEM

This service bulletin announces that the Part Restriction and Ordering Process Information for OnStar? Vehicle Communication Interface Modules (VCIM) (GMNA Only) has ended.

BUICK — ENCORE GX, TRAILBLAZER (2020–2021) — 8 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This technical bulletin provides a procedure to relocate the ground wire from the G58 Emission Purge Pump to the engine block directly to correct the customers concern.

BUICK — ENCORE GX, TRAILBLAZER (2020–2021) — 4 vehicle combinations

030000 BRAKES (PWS)

This engineering information (EI) Lite is requesting technicians follow the steps in this EI and submit a Field Product Report with the requested information and Submit in regards to a front brake noise Condition.

BUICK — ACADIA, BLAZER, ENCLAVE, EQUINOX, TERRAIN (2019–2020) — 30 vehicle combinations

110000 ELECTRICAL SYSTEM

This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to multiple DTC?s set after a battery discharge, jump start and/or battery repl

BUICK — ACADIA, BLAZER, ENCLAVE, TRAVERSE, XT5, XT6 (2017–2021) — 63 vehicle combinations

110000 ELECTRICAL SYSTEM

This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service AWD Lamp illuminated on the Driver Information Center (DIC) and

BUICK — ENCORE GX, MALIBU, TRAILBLAZER (2019–2021) — 12 vehicle combinations

100000 POWER TRAIN

This service bulletin provides information explaining possible normal CVT automatic transmission performance.

BUICK — ENCORE GX (2021) — 2 vehicle combinations

120000 EXTERIOR LIGHTING

Service Update. On certain vehicles equipped with automatic transmissions, the clutch spring retaining ring may not be fully seated. Vehicles with this condition may set DTC Code P0747 and the MIL light (malfunction indicator light) will i

BUICK — ACADIA, BLAZER, ENCLAVE, TRAVERSE, XT5, XT6 (2017–2021) — 63 vehicle combinations

110000 ELECTRICAL SYSTEM

This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service AWD Lamp illuminated on the Driver Information Center (DIC) and