Technical Service Bulletins (TSB)

BUICK — ENCORE (2017–2018) — 2 vehicle combinations

110000 ELECTRICAL SYSTEM

This Preliminary information communicates to dealers that if a repair is preformed in which the instrument panel accessory bezel has to be removed to disconnect the electrical connectors from the switches in the bezel or damage/disconnect c

BUICK — ACADIA, ENCLAVE, TRAVERSE (2011–2017) — 21 vehicle combinations

353400 EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.

This Preliminary information communicates of a concern with XM Radio displaying Willies Roadhouse on all channels under the genre section.

BUICK — 3500, 9-5, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CHEYENNE, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT6, CTS, DTS, ELR, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G VAN BUS, G3, G5, G6, G8, H2, H3, HHR, I-290, IMPALA, LACROSSE, LOW CAB 4500, LOW CAB 5500, LUCERNE, MALIBU, N300, N300 MAX, ORLANDO, OUTLOOK, REGAL, S10, SAVANA, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILVERADO, 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, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2010–2018) — 446 vehicle combinations

020000 SUSPENSION

This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer?s vehicles that exhibit vibration conditions without utilizing the

BUICK — 3500, ACADIA, ATS, AVALANCHE, AVEO, BOLT EV, CAMARO, CANYON, CAPRICE, CAPTIVA, CASCADA, CHEYENNE, CITY EXPRESS, COLORADO, CORVETTE, CRUZE, CT6, CTS, ELR, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, IMPALA, LACROSSE, LOW CAB 4500, LOW CAB 5500, MALIBU, N300, N300 MAX, ORLANDO, REGAL, S10, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILVERADO, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SONIC, SPARK, SPARK EV, SRX, SS, SUBURBAN, TAHOE, TERRAIN, TRAILBLAZER, TRAVERSE, TRAX, VERANO, VOLT, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2013–2018) — 293 vehicle combinations

353000 EQUIPMENT:ELECTRICAL

This Preliminary Information communication provides information to the technician about the Media Oriented Systems Transport Bus Diagnostic Tool Kit (EL-51578) has been released to help diagnose any of the Media Oriented Systems Transport b

BUICK — ACADIA, ATS, AVALANCHE, BOLT EV, CAMARO, CANYON, CASCADA, COLORADO, CORVETTE, CRUZE, CT6, CTS, DTS, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE ESV, LACROSSE, MALIBU, OUTLOOK, REGAL, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SONIC, SRX, STS, SUBURBAN, TAHOE, TERRAIN, TRAVERSE, TRAX, VERANO, VOLT, XT5, XTS, YUKON DENALI, YUKON XL (2005–2019) — 377 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble

BUICK — 3500, 9-5, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BLAZER, BOLT EV, CAMARO, CANYON, CAPRICE, CASCADA, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT6, CTS, DTS, ELR, ENCLAVE, ENCORE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G3, G5, G6, G8, H2, H3, HHR, IMPALA, LACROSSE, LOW CAB FORWARD 4500, LOW CAB FORWARD 5500, LOW CAB FORWARD 6500, LUCERNE, MALIBU, N300, OUTLOOK, REGAL, SAVANA, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SILVERADO 5500HD, SKY, SOLSTICE, SONIC, SPARK, SPARK EV, SRX, SS, STS, SUBURBAN, TAHOE, TERRAIN, TRAVERSE, TRAX, VERANO, VIBE, VOLT, VUE, XT4, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2010–2019) — 834 vehicle combinations

100000 POWER TRAIN

This warranty administration bulletin provide policy information for automatic transmission Oil Cooler Flush and flow test.

BUICK — ENVISION, EQUINOX, TERRAIN (2018–2021) — 22 vehicle combinations

357100 EQUIPMENT:APPLIANCE:AIR CONDITIONER

This technical bulletin provides a procedure air conditioning refrigerant desiccant replacement due to refrigerant loss.

BUICK — BLAZER, CT6, ENCLAVE, ENVISION, EQUINOX, ESCALADE, ESCALADE ESV, SUBURBAN, TAHOE, TERRAIN, TRAVERSE, XT5, YUKON, YUKON XL (2015–2019) — 196 vehicle combinations

160000 STRUCTURE

This informational bulletin provides information and operating tips for the hands free lift gate.

BUICK — 3500, 4500 SERIES, 9-3, 9-5, 9-7X, ACADIA, ALERO, ALERO EXPORT, ASTRA, ASTRO, ATS, AURA, AURORA, AVALANCHE, AVEO, AZTEK, B7, B7 MEDIUM DUTY, BLAZER, BOLT EV, BONNEVILLE, BRAVADA, C SERIES, CAMARO, CANYON, CAPRICE, CAPRICE POLICE PURSUIT, CAPTIVA, CAPTIVA SPORT, CASCADA, CATERA, CAVALIER, CENTURY, CHEVY VAN, CHEYENNE, CITY EXPRESS, CLASSIC, COBALT, COLORADO, CORVETTE, CRUZE, CT6, CTS, DEVILLE, DTS, ELDORADO, ELR, ENCLAVE, ENCORE, ENVISION, ENVOY, ENVOY XL, ENVOY XUV, EPICA, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, F SERIES, FIREBIRD, G SERIES, G VAN BUS, G3, G5, G6, G8, GM, GRAND AM, GRAND PRIX, GTO, H SERIES, H2, H3, HHR, IMPALA, INTRIGUE, ION, JIMMY, JIMMY CLASSIC, L200, L300, LACROSSE, LESABRE, LOW CAB 4500, LOW CAB 5500, LOW CAB FORWARD 6500, 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, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILHOUETTE, SILVERADO, SILVERADO 1500, SILVERADO 1500 HD, SILVERADO 2500, SILVERADO 2500 HD, SILVERADO 3500, SILVERADO 3500 HD, SILVERADO 4500HD, SILVERADO 5500HD, SILVERADO 6500HD, 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, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2000–2019) — 1112 vehicle combinations

120000 EXTERIOR LIGHTING

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

BUICK — 3500, 9-3, 9-5, 9-7X, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BOLT EV, C SERIES, CAMARO, CANYON, CAPRICE POLICE PURSUIT, CAPTIVA SPORT, CASCADA, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT6, CTS, DTS, ELR, ENCLAVE, ENCORE, ENVISION, ENVOY, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G VAN BUS, G3, G5, G6, G8, H2, H3, HHR, IMPALA, LACROSSE, LOW CAB 4500, LUCERNE, MALIBU, MONTANA, OUTLOOK, PURSUIT, REGAL, SAVANA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILVERADO 1500, SKY, SOLSTICE, SONIC, SPARK, SPARK EV, SRX, SS, STS, SUBURBAN, T SERIES, TAHOE, TERRAIN, TOPKICK, TORRENT, TRAILBLAZER, TRAVERSE, TRAX, UPLANDER, VERANO, VIBE, VOLT, VUE, W-SERIES, XT4, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2009–2019) — 455 vehicle combinations

350000 EQUIPMENT

This informational bulletin provides information for dealers/technicians on Use of Dealer Case Management (DCM) and Being Prepared for Contacting U.S. Technical Assistance (TAC).

BUICK — ATS, CTS, REGAL, TERRAIN, XTS (2018–2019) — 10 vehicle combinations

353000 EQUIPMENT:ELECTRICAL

This Preliminary information communicates information on 3 IPC Speedlimit concerns. Displayed speed limit is stuck on a value, not updating as the roadway speed limit changes. 2. Speed limit displays no value or is blank. 3. The speed

BUICK — ACADIA, ATS, BOLT EV, CAMARO, CANYON, COLORADO, CRUZE, CT6, CTS, ELR, EQUINOX, ESCALADE, ESCALADE ESV, IMPALA, LACROSSE, MALIBU, REGAL, SIERRA 1500, SILVERADO 1500, SUBURBAN, TAHOE, VOLT, XT5, XTS, YUKON, YUKON XL (2015–2018) — 95 vehicle combinations

110000 ELECTRICAL SYSTEM

This technical bulletin provides a procedure to replace the GEN I charging system with a GEN II charging system only if vehicles apply within the settings.

BUICK — CRUZE, ENCORE, EQUINOX, MALIBU, SPARK, TERRAIN (2016–2019) — 20 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This Preliminary information communicates the possibility of a crank no start or extended crank condition due to exhaust cam reluctor being out of position.

BUICK — ACADIA, ATS, CAMARO, CANYON, COLORADO, CT6, CTS, LACROSSE, XT5 (2016–2019) — 31 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This Preliminary information communicates a possible noise from the water pump causing a DTC and the diagnostics for the repair.

BUICK — ACADIA, CANYON, COLORADO, ENCLAVE, SIERRA 1500, SILVERADO 1500, SUBURBAN, TAHOE, TRAVERSE, XT4, XT5, YUKON, YUKON XL (2018–2019) — 72 vehicle combinations

123000 EXTERIOR LIGHTING:TAIL LIGHTS

This engineering informational bulletin is requesting information on product issue with the door weather strip, door body fit, and/or rear tail lamp moisture.

BUICK — ACADIA, ATS, CAMARO, CT6, CTS, LACROSSE, REGAL, XT5 (2016–2018) — 95 vehicle combinations

030000 BRAKES (PWS)

This service bulletin provides a procedure for replacing the oil pump, power brake booster and power brake booster vacuum hose to eliminate a hard brake pedal and/or air type noise heard upon brake apply due to oil in the brake booster.

BUICK — 3500, 4500 SERIES, 9-3, 9-5, 9-7X, ACADIA, ALERO, ALERO EXPORT, ASCENDER, ASTRA, ASTRO, ATS, AURA, AURORA, AVALANCHE, AVALANCHE 1500, AVALANCHE 2500, AVEO, AZTEK, B7, B7 MEDIUM DUTY, BLAZER, 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, CT6, CTS, DEVILLE, DTS, ELDORADO, ELR, ENCLAVE, ENCORE, ENVISION, ENVOY, ENVOY XL, ENVOY XUV, EPICA, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, ESCALADE EXT 1500, EXPRESS, F SERIES, F-SERIES, FIREBIRD, G SERIES, G VAN BUS, G3, G5, G6, G8, GM, GRAND AM, GRAND PRIX, GTO, H SERIES, H-SERIES, H2, H3, HHR, I-290, I-350, IMPALA, INTRIGUE, ION, JIMMY, JIMMY CLASSIC, L SERIES, L200, L300, LACROSSE, LESABRE, LOW CAB 4500, LOW CAB 5500, LUCERNE, LUMINA, LW200, M SERIES, M VAN, M/L VAN, MALIBU, METRO, MONTANA, MONTANA EXT, MONTE CARLO, N-SERIES, N300, N300 MAX, OPTRA, ORLANDO, OUTLOOK, P SERIES, PARK AVENUE, PRIZM, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, RIVIERA, S10, SAFARI, SAFARI (GMC), SAVANA, SEVILLE, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA 3500, SIERRA DENALI, SILHOUETTE, SILVERADO, SILVERADO 1500, SILVERADO 1500 HD, SILVERADO 2500, SILVERADO 2500 HD, SILVERADO 3500, SILVERADO 3500 HD, 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, XL7, XLR, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2000–2018) — 1182 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the ice to melt so that it can be drained from the related component

BUICK — REGAL, VERANO (2011–2016) — 7 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This Preliminary information communicates to the dealer an issue where the vehicle may exhibit a Service Engine soon light, inoperative tachometer, crank no start or extended crank condition. Dealers are directed to inspect the crankshaft r

BUICK — 3500, 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, CT6, CTS, DTS, ELR, ENCLAVE, ENCORE, 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, OUTLOOK, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, SAVANA, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, SILVERADO 4500HD, SILVERADO 5500HD, 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, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2007–2019) — 1174 vehicle combinations

220000 SEATS

This informational bulletin provides information for information on passenger presence sensing system (PPS or PSS) concerns with custom upholstery, accessory seat heaters or other comfort enhancing devices.

BUICK — 9-7X, ACADIA, ALERO, ASTRA, ASTRO, ATS, AURA, AVALANCHE, AVALANCHE 1500, AVEO, AZTEK, BLAZER, BOLT EV, BONNEVILLE, BRAVADA, C SERIES, CAMARO, CANYON, CAPRICE, CAPTIVA, CAPTIVA SPORT, CASCADA, CAVALIER, CENTURY, CHEYENNE, CITY EXPRESS, CLASSIC, COBALT, COLORADO, CORVETTE, CRUZE, CT6, CTS, DEVILLE, DTS, ELR, ENCLAVE, ENCORE, ENVISION, ENVOY, ENVOY XL, ENVOY XUV, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G3, G5, G6, G8, GRAND AM, GRAND PRIX, GTO, H2, H3, HHR, IMPALA, ION, JIMMY, JIMMY CLASSIC, L200, L300, LACROSSE, LESABRE, LUCERNE, MALIBU, MONTANA, MONTANA EXT, MONTE CARLO, N300, N300 MAX, ORLANDO, OUTLOOK, PARK AVENUE, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, S10, SAFARI, SAVANA, SEVILLE, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILHOUETTE, SILVERADO, SILVERADO 1500, SILVERADO 1500 HD, SILVERADO 2500, SILVERADO 2500 HD, SILVERADO 3500, SILVERADO 4500HD, SKY, SOLSTICE, SONIC, SONOMA, SPARK, SPARK EV, SRX, SS, SSR, STS, SUBURBAN, SUNFIRE, TAHOE, TERRAIN, TERRAZA, TOPKICK, TORRENT, TRACKER, TRAILBLAZER, TRAVERSE, TRAX, UPLANDER, VENTURE, VERANO, VIBE, VOLT, VUE, XLR, XT4, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2004–2019) — 786 vehicle combinations

110000 ELECTRICAL SYSTEM

This bulletin explains the labor operation numbers used for submitting warranty claims for module reprogramming and not when replacing a module.

BUICK — 9-3, 9-5, 9-7X, ACADIA, ASTRA, ATS, AURA, AVALANCHE, AVEO, BLAZER, BOLT EV, C SERIES, CAMARO, CANYON, CAPRICE POLICE PURSUIT, CAPTIVA, CASCADA, CITY EXPRESS, COBALT, COLORADO, CORVETTE, CRUZE, CT6, CTS, DTS, ELR, ENCLAVE, ENCORE, ENVISION, ENVOY, EQUINOX, ESCALADE, ESCALADE ESV, ESCALADE EXT, EXPRESS, G3, G5, G6, G8, GRAND PRIX, GTO, H2, H3, HHR, IMPALA, ION, LACROSSE, LUCERNE, MALIBU, MONTANA, MONTE CARLO, N300 MAX, OUTLOOK, PURSUIT, RAINIER, REGAL, RELAY, RENDEZVOUS, SAVANA, SIERRA, SIERRA 1500, SIERRA 2500, SIERRA DENALI, SILVERADO 1500, SILVERADO 2500, SILVERADO 3500, 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, XLR, XT4, XT5, XTS, YUKON, YUKON DENALI, YUKON DENALI XL, YUKON XL (2007–2019) — 587 vehicle combinations

190000 TIRES

This warranty administration bulletin provides information on The tires supplied with a new vehicle are covered by General Motors against defects in material or workmanship under the Bumper-to-Bumper New Vehicle Limited Warranty.

BUICK — ACADIA, ATS, CAMARO, CANYON, COLORADO, CRUZE, CT6, CTS, EQUINOX, LACROSSE, MALIBU, TERRAIN, VOLT (2018) — 52 vehicle combinations

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

Emissions Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain vehicles, equipped with 4-cylinder engines (RPO LHN, LEX, L3A, LYX, LKN, LE2, LCV or LTG). On some vehicles, an electrical connection in

BUICK — LACROSSE (2018–2019) — 2 vehicle combinations

160000 STRUCTURE

This Preliminary information communicates that a vehicle may come to the dealer with a complaint of a no start or a stall condition. The dealer technician is directed to inspect for the ground cable to G103 either not properly installed or

BUICK — ACADIA, ATS, CAMARO, CANYON, COLORADO, CRUZE, CT6, CTS, EQUINOX, LACROSSE, MALIBU, TERRAIN, VOLT (2018) — 26 vehicle combinations

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

Emissions Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain vehicles, equipped with 4-cylinder engines (RPO LHN, LEX, L3A, LYX, LKN, LE2, LCV or LTG). On some vehicles, an electrical connection in

BUICK — CRUZE, ENCORE, SONIC, TRAX (2011–2019) — 28 vehicle combinations

060000 ENGINE AND ENGINE COOLING

This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that have excessive oil consumption, blue smoke from the exhaust, or a Malfunction Indicator Lamp. Technician sho