Technical Service Bulletins (TSB)

BUICK — ENCORE GX, TRAILBLAZER (2021) — 6 vehicle combinations

060000 ENGINE (PWS)

Service Update. Certain vehicles equipped with a 1.3L gasoline engine (RPO L3T), have cylinder head outer bolts which were not tightened. Dealers are to retighten the cylinder head outer bolts.

BUICK — CAMARO, ENCORE GX, MALIBU, TRAILBLAZER (2019–2021) — 21 vehicle combinations

061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

Service Update. Certain vehicles may have engine control module software that leads to erroneous additional fuel enrichment under rare driving conditions. Dealers are to reprogram the engine control module.

BUICK — ACADIA, ATS, BLAZER, CAMARO, CANYON, CAPRICE POLICE PURSUIT, CAPTIVA, CAPTIVA SPORT, COLORADO, CT5, CT6, CTS, CTS-V, ENCLAVE, EQUINOX, IMPALA, LACROSSE, REGAL, SRX, TERRAIN, TRAVERSE, XT5, XT6, XTS (2010–2022) — 656 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This service bulletin provides a repair procedure to correct a customer concern of Coolant and/or Oil Leak, Malfunction Indicator Lamp (MIL) Illuminated?.

BUICK — 4500 SERIES, 9-3, 9-5, 9-7X, ACADIA, ALERO, ALERO EXPORT, ASTRA, ASTRO, ATS, AURA, AURORA, AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, AVEO, AZTEK, B7, B7 MEDIUM DUTY, BLAZER, BOLT EUV, BOLT EV, BONNEVILLE, BRAVADA, C SERIES, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CATERA, CAVALIER, CENTURY, CHEVY VAN, CHEYENNE, CITY EXPRESS, CLASSIC, COBALT, COLORADO, CONVENTIONAL, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DEVILLE, DTS, ELDORADO, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, ENVOY, ENVOY XL, ENVOY XUV, EPICA, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, ESCALADE EXT 1500, EXPRESS, F SERIES, FIREBIRD, G SERIES, G VAN BUS, G3, G5, G6, G8, GM, GRAND AM, GRAND PRIX, GTO, H SERIES, H2, H3, HHR, HUMMER EV, IMPALA, INTRIGUE, ION, JIMMY, JIMMY CLASSIC, L SERIES, L200, L300, LACROSSE, LESABRE, LUCERNE, LUMINA, LW200, M SERIES, M VAN, M/L VAN, MALIBU, METRO, MONTANA, MONTANA EXT, MONTE CARLO, N300, N300 MAX, OPTRA, ORLANDO, OUTLOOK, P SERIES, PARK AVENUE, PRIZM, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, RIVIERA, S10, SAFARI, SAFARI (GMC), SAVANA, SEVILLE, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILHOUETTE, SILVERADO 1500, SILVERADO 1500 HD, SILVERADO 2500, SILVERADO 2500 HD, SILVERADO 3500 HD, SILVERADO 4500HD, SKY, SL, SOLSTICE, SONIC, SONOMA, SPARK, SPARK EV, SRX, SS, SSR, STS, SUBURBAN, SUNFIRE, T SERIES, TAHOE, TERRAIN, TERRAZA, TOPKICK, TORRENT, TRACKER, TRAILBLAZER, TRANS SPORT, TRAVERSE, TRAX, UPLANDER, V SERIES, VENTURE, VERANO, VIBE, VOLT, VUE, W SERIES, W-SERIES, XLR, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2000–2022) — 3693 vehicle combinations

120000 EXTERIOR LIGHTING

This service bulletin provides information for dealers/technicians on Exterior Lamp Condensation and Water Leaks and Replacement Guidelines.

BUICK — ACADIA, BLAZER, CAMARO, CT6, ENCLAVE, ENCORE GX, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, TRAILBLAZER, TRAVERSE, XT4, XT5, XT6 (2020–2021) — 57 vehicle combinations

118000 ELECTRICAL SYSTEM:SOFTWARE

This service bulletin provides U157 software update information to correct customer concerns of radio Software related issues.

BUICK — ACADIA, BLAZER, CRUZE, CT6, ENCLAVE, EQUINOX, LACROSSE, MALIBU, REGAL, SIERRA 1500, SILVERADO 1500, TERRAIN, TRAVERSE, XT4, XT5, XT6 (2017–2021) — 114 vehicle combinations

061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set.

BUICK — ACADIA, BLAZER, BOLT EV, CT6, ENCLAVE, ENCORE GX, EQUINOX, LACROSSE, SIERRA 1500, SILVERADO 1500, TERRAIN, TRAVERSE, XT4, XT5, XT6 (2019–2021) — 36 vehicle combinations

110000 ELECTRICAL SYSTEM

This Preliminary information communicates a condition where the Video Processing Control Module is not able to be programmed to the vehicle. This PI offeres a couple workarounds while Engineering evaluates the concern.

BUICK — ENVISION (2021) — 3 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 Malfunction Indicator Lamp (MIL) Illuminated on Driver Information Center (DIC), D

BUICK — ACADIA, BLAZER, CAMARO, ENCORE GX, MALIBU, SIERRA 1500, SILVERADO 1500, TRAILBLAZER, XT4, XT5, XT6 (2021) — 11 vehicle combinations

353610 EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE

Service Update - Radio Software Update (OTA) - Certain 2021 model year vehicles listed above, with an infotainment system, may have a condition where the infotainment system screen will appear black with no audio and no chime at key on duri

BUICK — 3500, 4500, 4500HD, 5500HD, 9-5, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BLAZER, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CHEYENNE, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DTS, ELR, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, EXPRESS 1500, EXPRESS 2500, EXPRESS 3500, EXPRESS 4500, G VAN BUS, G3, G5, G6, G8, H2, H3, HHR, IMPALA, LACROSSE, LUCERNE, MALIBU, N300, N300 MAX, ORLANDO, OUTLOOK, REGAL, S10, SAVANA, SAVANA 2500, SAVANA 3500, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SKY, SOLSTICE, SONIC, SPARK, SPARK EV, SRX, SS, STS, SUBURBAN, T SERIES, TAHOE, TERRAIN, TOPKICK, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VIBE, VOLT, VUE, W-SERIES, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2010–2021) — 858 vehicle combinations

130000 VISIBILITY

This Preliminary Information communication provides information to the technician about vehicles with tire sidewall irregularities. This is a visual condition that will not affect durability, reliability or performance of the tires. Dealer

BUICK — ACADIA, ATS, AURA, AVALANCHE, BLAZER, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, DTS, ELR, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, EXPRESS, EXPRESS 1500, EXPRESS 2500, EXPRESS 3500, EXPRESS 4500, G5, G6, H3, HHR, IMPALA, LACROSSE, LUCERNE, MALIBU, OUTLOOK, REGAL, SAVANA, SAVANA 2500, SAVANA 3500, SIERRA 1500, SIERRA 2500, SIERRA 3500, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SKY, SOLSTICE, SONIC, SPARK, SRX, SS, STS, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VIBE, VOLT, VUE, XT4, XT5, XT6, XTS, YUKON (2010–2021) — 439 vehicle combinations

353710 EQUIPMENT:ELECTRICAL:ACCESSORY GENERATOR:CONTROLS

This Preliminary Information communication provides information to the technician that General Motors Technical Assistance Center may ask for Global Diagnostic System 2 Session Log. Technician will need use Global Diagnostic System 2 to sen

BUICK — 3500, 4500, 4500HD, 5500HD, 9-5, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BLAZER, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CHEYENNE, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DTS, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G VAN BUS, G3, G5, G6, G8, H2, H3, HHR, IMPALA, LACROSSE, LOW CAB FORWARD 6500, LUCERNE, MALIBU, N300, N300 MAX, ORLANDO, OUTLOOK, REGAL, S10, 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, TOPKICK, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VIBE, VOLT, VUE, W-SERIES, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2010–2021) — 1629 vehicle combinations

102000 POWER TRAIN:MANUAL TRANSMISSION

This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.

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

185000 VEHICLE SPEED CONTROL:CRUISE CONTROL

This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Lane Keep Assist and/or Adaptive Cruise Control being Inoperative.

BUICK — ENVISION, EQUINOX, TERRAIN (2016–2021) — 65 vehicle combinations

030000 BRAKES (PWS)

This technical bulletin provides repair information to correct a customer concern of the Service Engine Soon Lamp Illuminated and/or Service Brake Assist Message Displayed, with DTC P0557 Stored.

BUICK — ATS, CTS, REGAL, TERRAIN, XTS (2018–2020) — 20 vehicle combinations

274300 LANE DEPARTURE:LANE KEEP:NAVIGATION SYSTEM/SOFTWARE

This Preliminary information communicates steps to perform to determine if the concern relates to a Navigation loading concern that is under engineering investigation.

BUICK — ACADIA, ATS, BLAZER, BOLT EUV, BOLT EV, CAMARO, CANYON, CASCADA, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, ENCLAVE, ENCORE, ENCORE GX, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, EXPRESS, HUMMER EV, IMPALA, LACROSSE, MALIBU, REGAL, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SONIC, SPARK, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, TRAVERSE, TRAX, VOLT, XT4, XT5, XT6, XTS, YUKON, YUKON XL (2019–2022) — 276 vehicle combinations

345000 COMMUNICATION: VEHICLE TO INFRASTRUCTURE

This service bulletin provides information to inform dealership personnel about Law Enforcement and Government vehicles that request to disable or enable content.

BUICK — ENCLAVE, TRAVERSE (2020–2021) — 4 vehicle combinations

060000 ENGINE (PWS)

This Preliminary information communicates a noise from the purge hose heard in the vehicle and the repair preliminary instructions to dampen this noise. PI was modified to add a special labor operation for this PI.

BUICK — 3500, 4500, 4500HD, 5500HD, 9-7X, ACADIA, ASTRA, ASTRO, ATS, AURA, AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, AVEO, AZTEK, BLAZER, BOLT EV, BONNEVILLE, C SERIES, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CAVALIER, CENTURY, CITY EXPRESS, CLASSIC, COBALT, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DEVILLE, DTS, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, ENVOY, ENVOY XL, ENVOY XUV, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, ESCALADE EXT 1500, EXPRESS, G VAN BUS, G3, G5, G6, G8, GRAND AM, GRAND PRIX, GTO, H2, H3, HHR, IMPALA, ION, JIMMY CLASSIC, L200, L300, LACROSSE, LESABRE, LOW CAB FORWARD 6500, LUCERNE, MALIBU, MONTANA, MONTE CARLO, N300 MAX, OUTLOOK, PARK AVENUE, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, SAFARI, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 1500 HD, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SKY, SOLSTICE, SONIC, SPARK, SPARK EV, SRX, SS, SSR, STS, SUBURBAN, SUNFIRE, T SERIES, TAHOE, TERRAIN, TERRAZA, TOPKICK, TORRENT, TRAILBLAZER, TRAVERSE, TRAX, UPLANDER, VENTURE, VERANO, VIBE, VOLT, VUE, W-SERIES, XLR, XT4, XT5, XT6, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2005–2021) — 2478 vehicle combinations

100000 POWER TRAIN

This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.

BUICK — ACADIA, ATS, AVEO, BLAZER, BOLT EUV, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CASCADA, CHEYENNE, CITY EXPRESS, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, EXPRESS, HUMMER EV, IMPALA, LACROSSE, 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 XL (2015–2022) — 672 vehicle combinations

350000 EQUIPMENT

This service bulletin provides information on GM Accessories ? Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.

BUICK — CORVETTE, CT4, CT5, ENVISION, ESCALADE, ESCALADE ESV, SUBURBAN, TAHOE, YUKON, YUKON XL (2020–2021) — 52 vehicle combinations

110000 ELECTRICAL SYSTEM

This service bulletin provides repair information to correct a customer concern of Memory Seat Module Does Not Adjust.

BUICK — CORVETTE, CT4, CT5, ENVISION, ESCALADE, ESCALADE ESV, SUBURBAN, TAHOE, YUKON, YUKON XL (2020–2021) — 26 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 the Malfunction Indicator Lamp (MIL) illuminated on Driver Information Center (DIC

BUICK — 3500, 4500, 4500HD, 4500XD, 5500HD, 5500XD, 9-7X, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, AVEO, BLAZER, BOLT EV, C SERIES, CAMARO, CANYON, CAPRICE, CAPTIVA, CASCADA, CITY EXPRESS, CLASSIC, COBALT, COLORADO, CORVETTE, CRUZE, CT4, CT5, CT6, CTS, CTS-V, DTS, ELR, ENCLAVE, ENCORE, ENCORE GX, ENVISION, ENVOY, ENVOY XL, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, ESCALADE EXT 1500, EXPRESS, G VAN BUS, G3, G5, G6, G8, GRAND PRIX, GTO, H2, H3, HHR, IMPALA, ION, LACROSSE, LESABRE, LUCERNE, MALIBU, MONTANA, MONTE CARLO, N300, OUTLOOK, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SILVERADO 5500HD, SILVERADO 6500HD, SKY, SOLSTICE, SONIC, SPARK, SPARK EV, SRX, SS, SSR, 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 (2006–2021) — 779 vehicle combinations

350000 EQUIPMENT

This warranty administration bulletin provides policy information for GM courtesy transportation and roadside assistance programs.

BUICK — 3500, 4500HD, 5500HD, ACADIA, ATS, AVEO, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CASCADA, CHEYENNE, CITY EXPRESS, COLORADO, CORVETTE, CRUZE, CT6, CTS, ELR, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, EXPRESS, IMPALA, LACROSSE, MALIBU, N300, N300 MAX, ORLANDO, REGAL, S10, SAVANA, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SONIC, SPARK, SPARK EV, SRX, SS, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VOLT, XT5, XTS, YUKON, YUKON XL (2015–2018) — 192 vehicle combinations

100000 POWER TRAIN

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

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

030000 BRAKES (PWS)

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 — CRUZE, ENCORE, SONIC, TRAX (2011–2020) — 31 vehicle combinations

120000 EXTERIOR LIGHTING

This Preliminary Information communication provides information to the technician about vehicles that may have a Malfunction Indicator Lamp on. The technician may find Diagnostic Trouble Codes P0299 or P0234 set. The technician is provided