GMC Truck Service and Maintenance
Professional Grade
GMC has distinguished itself as GMC's premium truck and SUV division since 1912, offering "professional grade" vehicles that blend capability with upscale refinement.
OUR EXPERIENCE WITH GMC VEHICLES
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At Westco Automotive, we see GMC owners who appreciate the premium touches but need the same rugged capability as their Chevrolet counterparts. Our technicians understand that beneath the Denali trim and polished grille, these are GM trucks with familiar engineering—and familiar issues. We've performed countless AFM lifter replacements on Yukons and Sierras, instrument cluster repairs, and 4WD system service. Whether it's a Sierra HD with Duramax power or a Terrain with timing chain concerns, we treat every GMC with the professional grade attention it deserves.
Some common repairs for GMC Vehicles:
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AFM (Active Fuel Management) lifter failure repairs
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Instrument cluster stepper motor replacement
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4WD transfer case encoder motor replacement
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Brake line corrosion replacement
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Transmission torque converter shudder
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Magnetic ride suspension diagnostics and repair
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Door check strap replacement
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FM/DOD lifter failure (2007-2013 models)
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Instrument cluster repair (pixel loss, stepper motor failure)
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4WD transfer case encoder motor replacement
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Brake line corrosion replacement
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Duramax CP4 fuel pump prevention and replacement
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Transmission torque converter shudder
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Diesel exhaust fluid (DEF) system repairs
Some known Issues by model:
GMC Sierra 1500 (2007-2013): AFM lifter failure, instrument panel cluster pixel loss, brake line corrosion, transmission torque converter shudder
GMC Yukon (2007-2014): AFM issues, magnetic ride compressor failure, rear main seal leaks, dash pixel loss, liftgate strut failure
GMC Acadia (2007-2016): Timing chain wear, transmission shudder, air conditioning evaporator failures, power steering issues
GMC Sierra 2500/3500 (2011-2016): CP4 fuel pump failures (Duramax), DEF system issues, front suspension wear, transfer case pump rub
GMC Terrain (2010-2017): Excessive oil consumption (2.4L engine), timing chain stretch, water pump failures, transmission issues
GMC Sierra 1500 (1999-2006): Instrument cluster stepper motor failure, intermediate steering shaft clunk, fuel pump failures, 4WD encoder motor issues
GMC Sierra 1500 (2007-2013): AFM lifter failure, transmission torque converter shudder, brake line corrosion, heated seat failures
GMC Sierra 2500/3500 (2001-2007): Front end wear (ball joints, pitman/idler arms), injector issues (LB7/LLY), transfer case pump rub
GMC Sierra 2500/3500 (2011-2016): CP4 fuel pump failures (LML Duramax), DEF system issues, front suspension wear, turbo failures
GMC Sierra 3500 HD (2017-present): CP4 pump concerns, DEF system issues, rear axle fluid leak (some models)
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Interesting Information
GMC's Denali trim, introduced in 1999 on the Yukon, has become so successful that it now accounts for over 25% of GMC sales and has spawned its own sub-brand of accessories and even a Denali version of the GMC Acadia. The name comes from Denali, the highest peak in North America and The GMC Syclone of 1991 was a technological marvel—a turbocharged V6 AWD pickup that could accelerate from 0-60 in 4.3 seconds, faster than a Ferrari 348 of the same year. Only 2,995 were produced, making them highly collectible today.