AUTO PARTS

PARTS FOR YOUR PROFESSIONAL GRADE VEHICLE

Your GMC Certified Service technician is trained to know every inch of your vehicle and can recommend GM Genuine Parts and ACDelco parts. GM Genuine Parts and ACDelco Original Equipment are the true OE parts installed during the production of GM vehicles like your Professional Grade GMC. Now these same quality parts used by our highly-skilled technicians are now available to you online. We have more than a century of design and engineering experience behind us and a future of certainty ahead with parts now available online. We have more than a century of design and engineering experience behind us and a future of certainty ahead with parts now available online for your expert technician or you.

Below you will find an overview of the major systems and auto parts within your vehicle and signs of significant wear and tear. When the time is right, or if you ever have concerns, take your vehicle back to your GMC dealer for any type of auto repair service - major or minor. Nobody knows your Professional Grade GMC better.

HVAC & ENGINE COOLING PARTS

Accumulator/Drier:
The accumulator in your vehicle gathers and stores liquid refrigerant until it’s converted into a gas refrigerant.

Sign of wear may include:
Lack of or insufficient cooling in cabin

Compressor:
The compressor compresses refrigerant. The compression leads to a change in the refrigerant’s boiling point, which helps create the cold air that is delivered through the HVAC system.

Signs of wear may include:
Lack of or insufficient cooling
Excessive clicking sounds or unusual noises during A/C operation

Water Pump:
The water pump is responsible for circulating engine coolant through the radiator and engine system to help maintain optimal engine operating temperatures.

Signs of wear:
Engine overheating
Leaking coolant

Condenser:
The condenser cools refrigerant gas back into a liquid state.

Sign of wear may include:
Reduced cooling capacity in vehicle cabin due to physical damage or debris

Compressor Clutch:
A critical component of your HVAC system, the compressor clutch engages and disengages your compressor.

Signs of wear may include:
Reduced cooling in vehicle interior
Noise when running A/C system
Rubbing/grinding noise when A/C is off

Blower Motor:
Your vehicle’s blower motor drives air through the HVAC system and into your cabin.

Signs of wear may include:
Lack of or diminished airflow through cabin vents
Unusual noises coming from blower motor

Engine Cooling Fan:
The engine cooling fan, located behind your radiator, draws cool outside air through the condenser and radiator at low-speed operation to cool the engine.

Signs of wear may include:
Engine overheats
Fan doesn’t turn on
Poor A/C performance

Expansion Valve:
The expansion valve restricts the flow of refrigerant, allowing it to change from a high-pressure liquid to a low-pressure gas, which provides the cooling effect of A/C.

Sign of wear may include:
Lack of cooling in cabin

Evaporator:
Warm air from inside your vehicle is delivered to your evaporator. Moisture and heat are then removed from the air and returned to your cabin.

Sign of wear may include:
Lack of cooling in cabin

Heater Core:
Hot engine coolant from the cooling system circulates through the heater core to provide warm air to the passenger compartment.

Signs of wear may include:
Sweet smell coming from vents
Insufficient heat from vents
Wet carpet on passenger side

Radiator:
Engine coolant flowing through the radiator is cooled by wind and the radiator fan, helping to keep the engine within proper operating temperatures.

Signs of wear may include:
Leaking (often a bright green color)
Engine overheats
Sweet smell

Thermostat:
The thermostat regulates the temperature of the engine coolant to maintain proper engine operating temperature.

Signs of wear may include:
Engine overheats
Reduced fuel economy
Insufficient heat in cabin

BATTERY & IGNITION PARTS

Alternator/Generator:
Your car’s alternator/generator provides power to electrical systems and charges the battery while the vehicle is running.

Signs of wear may include:
Engine won’t turn over
Loss of battery power
Some loss of electrical power
Alternator warning light illuminates
Dim headlamps

Ignition Coil:
The ignition coil increases electrical system voltage to help ignite the air/fuel mixture.

Signs of wear may include:
Engine won’t start
Engine misfiring
Visible cracks in coil body

Ignition Modules:
Later-model vehicles with a distributor and coil pack use an ignition module as a switch that, when engaged, supplies power to the coil, which in turn creates the spark that ignites the air/fuel mixture.

Signs of wear may include:
Engine won’t start
Engine misfiring

Ignition Wire Set: Limited Lifetime Parts Warranty Protection
This specialized wire set carries voltage from the ignition coil, electronic coil pack, or distributor to the spark plugs.

Signs of wear may include:
Difficult engine starting
Misfiring
Decreased fuel economy

Starting Motor & Solenoid:
When starting the engine, the solenoid is energized, which engages the starter pinion into the flywheel, while the starter motor drives the pinion to crank the engine.

Signs of wear may include:
Poor starting qualities, including repeated starting attempts
Grinding while cranking
Intermittent starter engagement while trying to start the engine

Battery: Learn More
Your vehicle’s battery supplies and stores electrical energy from the alternator when the vehicle’s engine is running. The vehicle’s battery provides energy to start the engine, plus supplies power to accessories when the engine is not running. For the best combination of longevity, power, and price, we proudly offer a wide range of ACDelco batteries.

Signs of wear may include:
Slow cranking
Weak/dim lights while cranking

Distributor Cap:
Vehicles equipped with a distributor use the distributor cap to act as a hub for spark plug and ignition coil wires.

Signs of wear may include:
Inability to start engine
Poor starting qualities
Misfiring
Decreased fuel economy

Spark Plugs:
Spark plugs provide the spark that ignites the air/fuel mixture within an engine’s cylinders.

Signs of wear may include:
Lack of power
Sluggish acceleration
Poor fuel economy

FUEL & ENGINE EMISSION PARTS

Modular Fuel Pump/Sender:
This two-part component delivers fuel from your tank to the fuel injectors while monitoring and sending fuel-level information to your fuel gauge.

Signs of wear may include:
Difficulty starting engine
Slow acceleration qualities
Intermittent power loss
Inaccurate fuel gauge reading

Engine Control Module (ECM):
This module monitors and synchronizes the operation of the ignition, emission, and fuel-injection systems. All sensors input information to the ECM to constantly adjust the air/fuel mixture for optimum emissions, drivability, and performance.

Signs of wear may include:
Engine won’t start
Reduced or loss of engine power
“Service Engine Soon” light illuminates

Exhaust Gas Recirculation (EGR) Valve:
The EGR valve recirculates some of the engine’s exhaust gas back into the intake manifold to be reburned, reducing emissions.

Signs of wear may include:
Rough-running engine
Engine hesitation or stalling
“Service Engine Soon” light illuminates

Fuel Injector:
The fuel injector sprays a fine mist of fuel into a vehicle’s intake manifold or cylinders a fraction of a second before the spark plug ignites it.

Signs of wear may include:
Sluggish engine performance
Poor acceleration
“Service Engine Soon” light illuminates

Mass Air Flow Sensor:
This sensor measures the amount of air entering the engine.

Signs of wear may include:
Engine hesitation
Stalling
Decline in engine performance
“Service Engine Soon” light illuminates

Oxygen Sensor:
The oxygen sensor measures the amount of leftover oxygen from the combustion process in the exhaust.

Signs of wear:
Rough-running engine
Poor fuel economy
“Service Engine Soon” light illuminates

Engine Coolant Temperature Sensor:
Constantly measures the engine’s coolant temperature.

Signs of wear may include:
Cooling fan(s) on high all the time
Poor fuel economy
“Service Engine Soon” light illuminates

Intake Air Temperature Sensor:
Constantly measures the temperature of the incoming air to the engine.

Signs of wear may include:
Rough-running engine
Poor fuel economy
“Service Engine Soon” light illuminates

Humidity Sensor:
Constantly measures the humidity of the incoming air to the engine.

Sign of wear may include:
“Service Engine Soon” light illuminates

Knock Sensor:
Constantly measures the spark knock from the engine so the ECM can adjust the ignition timing to reduce it.

Signs of wear may include:
Lack of power
“Service Engine Soon” light illuminates

Throttle Position Sensor (throttle body):
Constantly measures the opening of the throttle body as you depress the accelerator.

Signs of wear may include:
“Reduced Engine Power” light illuminates

Accelerator Pedal Position Sensor:
Constantly measures the amount the accelerator is depressed so the ECM can open the throttle proportionately to increase acceleration.

Signs of wear may include:
“Reduced Engine Power” light illuminates

Fuel Pressure Sensor:
Constantly measures the fuel pressure in the fuel rail so the ECM can maintain the pressure at optimum levels.

Signs of wear may include:
Ticking noise from engine
“Service Engine Soon” light illuminates

Fuel Composition Sensor:
On vehicles equipped to run on E85 ethanol, this sensor constantly measures the amount of ethanol in the fuel.

Signs of wear may include:
“Service Engine Soon” light illuminates

Positive Crankcase Ventilation (PCV) Valve:
Your vehicle’s PCV valve is designed to regulate unspent combustion gases so they can be burned in the engine.

Signs of wear may include:
Engine runs rough or unexpectedly stalls
“Service Engine Soon” light illuminates

Catalytic Converter(s):
The catalytic converter is an emission control device added to the engine exhaust system in order to help reduce hydrocarbons, carbon monoxide, and oxides of nitrogen pollutants from the exhaust gas.

Signs of wear may include:
Exhaust is louder
Rotten-egg smell

Resonator:
Some exhaust systems are equipped with a resonator. The resonator, located either before or after the muffler, allows the use of mufflers with less back pressure. Resonators are used when vehicle characteristics require specific exhaust tuning.

Signs of wear may include:
Exhaust is louder
Clunking noise in rear of vehicle

Muffler & Tailpipe:
The exhaust muffler reduces the noise levels of the engine exhaust by the use of tuning tubes. The tuning tubes create channels inside the exhaust muffler that lower the sound levels created by the combustion of the engine. The tailpipe carries the exhaust gases from the muffler to the rear of your vehicle.

Signs of wear may include:
Exhaust is louder
Clunking noise in rear of vehicle

DRIVELINE/POWERTRAIN PARTS

Wheel Bearing: Limited Lifetime Parts Warranty Protection
The wheel bearing is mounted on a wheel hub, which in turn is connected to the axle. The bearings help reduce friction and increase your control of the vehicle as the wheel turns over the surface of the road.

Signs of wear may include:
Grinding
Whining or squealing noises
Looseness or roughness felt in the steering wheel

CV Joint/Boot:
The CV boot protects the CV joint (in front-wheel-drive automatic transaxle vehicles) from harmful moisture, sand, dust, and other roadway debris. If the boot is worn or damaged, these particles can eat away at the CV joint, potentially causing the need to replace the CV joint or even a half axle.

Signs of wear may include:
Lubricant leak
Clicking sounds during turning
Clunks during acceleration
Front-end vibrations

Engine: Learn More
The engine is the heart of your vehicle. Most engines use combustion (igniting an air/fuel mixture to create mechanical energy) to create power that is delivered to the wheels, which in turn propels the vehicle.

Signs of wear may include:
Rough running
High oil or fuel consumption
Visible smoke while engine is running

Transmission/Transaxle: Learn More
The transmission/transaxle in your vehicle uses a combination of hydraulics and gears to transfer power from the engine to the wheels. Transmissions are utilized in rear-wheel-drive applications and transaxles on front-wheel-drive.

Signs of wear may include:
Noticeable transmission/transaxle slippage
Lack of acceleration
Transmission fluid emits a burning odor

Differential/Rear Axle:
The differential receives power from the drive shaft and delivers power to rear-drive wheels through a series of gears.

Signs of wear may include:
Clanking noise
Whining or humming noise at steady speed or during coast down

Flywheel:
This round, multi-toothed disc connects the engine, clutch system, and automatic transmission.

Signs of wear may include:
Noticeable transmission slippage
Lack of acceleration
Failure to engage
Erratic transmission operation

Clutch:
Manual vehicles use this combination of components to engage and disengage the engine to and from the transmission for changing gears.

Signs of wear may include:
Clutch slippage
Clutch engage failure

SUSPENSION PARTS

Shocks & Struts: Limited Lifetime Parts Warranty Protection
The ride and handling system supports your vehicle’s weight, helps keeps the wheels in contact with the road, and helps provide a comfortable ride.

Signs of wear may include:
Excessive ball joint play
Leaking oil along the shock body
Broken mounts or mounting hardware
Worn or missing bushings
Excessive vehicle bounce
Cupped tire wear

Shock Absorber: Limited Lifetime Parts Warranty Protection
The shock absorbers on your vehicle help minimize spring bounce, helping to keep wheels in contact with the road and providing a smoother ride.

Signs of wear may include:
Excessive vehicle bounce
Cupped tire wear

Strut Mount/Bearing:
The strut mount helps improve strut operation by absorbing energy and restoring smooth steering, while the bearing allows the strut to turn with the wheels while steering.

Signs of wear:
Suspension noise
Uneven tire wear
Steering wheel does not easily return to center position

Ball Joint:
The ball joint is a pivot point for the wheel assembly, allowing the wheels to turn and move up and down with the suspension.

Signs of wear may include:
Rough ride
Play in steering-wheel
Slow or stiff steering-wheel return
Excessive tire wear on one side

Coil Springs:
Your suspension system’s coil springs support the weight of your vehicle and maintain vehicle ride height.

Signs of wear may include:
Low vehicle ride height
Rough, unstable, or uncontrollable ride
Excessive tire wear on one side

Bushing:
The bushings attached to the suspension system provide a cushioned link between control arms and chassis.

Signs of wear may include:
Excessive steering-wheel play
Hard steering
Noise
Wobble
Irregular tire wear

Control Arm:
Control arms join wheel hubs to the vehicle frame, allowing for a full range of motion while maintaining proper wheel alignment.

Signs of wear may include:
Uneven tire wear
Suspension noise or misalignment
Steering-wheel wobble or vibration

STEERING PARTS

Power Steering:
The hydraulic power-steering pump is a constant displacement pump that provides hydraulic pressure and flow for the power-steering gear. The hydraulic power-steering pump is belt-driven off your engine.

Signs of wear may include:
Fluid leakage
Difficult low-speed steering
Whining noise while turning
Steering-wheel wobble
Pump housing leakage

Rack-and-Pinion
This steering assembly uses a long steel bar that is meshed with a pinion gear and connected to rods that turn the front wheels. The rack-and-pinion can be hydraulically assisted by a power-steering pump or electrically assisted.

Signs of wear may include:
Excessive play in steering wheel
Steering-wheel vibration
Unusual noises while turning the wheel

Idler Arm:
The idler arm in your vehicle acts as a pivot point to the steering linkage assembly.

Sign of wear may include:
Irregular tire wear, such as feathering or scrubbing

Pitman Arm:
On vehicles that utilize a steering gear, the pitman arm connects the steering gear and steering linkage.

Sign of wear may include:
“Wandering” and excessive steering with little directional change

Tie-Rod End:
The tie-rod end connects or ties the steering linkage to the wheel hub assembly, allowing for the transfer of motion to the wheel.

Signs of wear may include:
Rough or stuttered steering
Play in steering-wheel
Inner or outer tire edge wear

BELTS/HOSES/FILTERS

V-Ribbed Serpentine Belt:
This belt transfers power from the crankshaft to the alternator, water pump, air conditioning compressor, and power-steering pump (if applicable).

Signs of wear may include:
Slipping and/or squealing belt
Dimming headlights while driving
Loss of battery charging

Timing Chain/Belt:
Your vehicle’s timing chain/belt synchronizes the engine’s camshaft and crankshaft.

Signs of wear may include:
Engine stops
Engine backfires

Air Conditioning Hose:
Refrigerant stored under high pressure is transferred from your vehicle’s evaporator in the engine compartment to the condenser in front of the radiator.

Sign of wear may include:
A/C inoperative

Heater Hose:
The heater hose within your vehicle routes the hot engine coolant to the heater core to heat the cabin.

Signs of wear may include:
Coolant leak
Cracking/hardening/brittleness of hose

Radiator Hose:
The radiator hose moves coolant from the engine to the radiator to be cooled.

Signs of wear may include:
Leaking
Elevated engine temperature
Coolant leak
Cracking/hardening/brittleness of hose
“Check Engine” light illuminates

Engine Air Filters:
These filters prevent harmful debris from entering your engine.

Signs of wear may include:
Sluggish acceleration
Decreased fuel efficiency

Oil Filter:
Your vehicle’s oil filter filters engine oil to help reduce wear on the engine’s internal components.

Signs of wear may include:
Oil leaks
Burning oil smell

Automatic Transmission Filter:
This filter helps keep certain abrasive particles in the transmission fluid from reaching the transmission’s internal components.

Signs of wear may include:
Late shifts
Slipping in and out of gear

In-Line Fuel Filter:
This filter is designed to trap fuel contaminants before they enter the engine’s fuel-delivery system.

Signs of wear may include:
Lack of power
Vehicle will not start
Vehicle only runs in idle or low speeds

Cabin Air Filter:
Cabin air filters help prevent unwanted particulates from entering the cabin through the HVAC system.

Sign of wear may include:
Decreased climate-control (heating and A/C) airflow

SCHEDULE SERVICE

VIEW OFFERS

GMC PARTS AND LABOR WARRANTY

Your GMC was designed to be bold from the inside out. Make sure you have the correct warranty to keep it that way. Visit your local GMC dealership to see what warranty suits your needs based on your vehicle and its parts, so your GMC can continue making a bold statement. Read below to see information on each Parts and Labor Warranty.

24-MONTH/UNLIMITED-MILE LIMITED WARRANTY

Our most common Parts Warranty offers a coverage period on a majority of our Service Replacement Parts including, labor (GM Genuine Parts included), as long as the part was installed by a General Motors dealership. Please visit your local GM dealership to learn more about the warranty part details and qualifications. Warranty effective April 1, 2018. Parts that are covered include:

ACDelco GM Original Equipment Brakes
ACDelco GM Original Equipment Rotors
ACDelco GM Original Equipment Alternators and Starters
ACDelco Gold (Professional) Brakes
ACDelco Gold (Professional) Rotors
ACDelco Gold (Professional) Alternators and Starters

Visit your local GM dealership for more product details.

LIMITED LIFETIME WARRANTY

General Motors offers a Limited Lifetime Warranty on specific service parts sold by GM dealers. GM warrants to the purchaser that it will replace these specific GM Genuine Parts for all manufacturer defects, including 24 months of labor (see list below):

Chassis Parts
Fuel Pumps – Electronic
Ignition Wire Sets
Radiators
Shock Absorbers/Struts
Wheel Bearings – Hub Bearings

Effective Date: This Limited Lifetime Warranty is valid for parts purchased on or after April 1, 2014 and shall remain in effect for as long as the named purchaser owns the vehicle on which the part was installed.

Qualifications: It will be incumbent on the purchaser to retain the original sales receipt and/or job card, together with the properly completed warranty reimbursement form. A warranty reimbursement form is provided at time of purchase or can be downloaded from the internet at genuinegmparts.com

12-MONTH/UNLIMITED WARRANTY

Effective April 1, 2018, General Motors offers a 12-month/unlimited-mile coverage period on these select ACDelco Replacement Parts including labor as long as the part was installed by a General Motors dealership (see list below):

ACDelco Silver (Advantage) Wheel Bearings - Hub
ACDelco Silver (Advantage) Shocks and Struts
ACDelco Silver (Advantage) Brakes
ACDelco Silver (Advantage) Chassis Parts
Parts that include bolts, fasteners, grommets, spacers, shims, washers, and clips

EXCLUSIONS

The 24-Month/Unlimited-Mile Limited Warranty, the Limited Lifetime Warranty, and the 12-Month/Unlimited Warranty exclude the following:

Fluids or any additional parts necessary to complete the installation
Damage due to improper installation, alteration, or objects striking the part
Damage caused by the use of a coolant or coolant mixture not in accordance with the vehicle warranty
Improper application; use of part in a manner not specified by General Motors
Loss of time, inconvenience, loss of use, or other incidental or consequential damages

ORIGINAL PURCHASER’S OBLIGATION

This auto part warranty remains in effect for as long as the original purchaser owns the eligible vehicle on which the part(s) was originally installed. The original purchaser seeking a repair must return the vehicle to a GMC, Buick, Chevrolet, or Cadillac dealership. The original purchaser must provide a copy of the original auto repair order showing that a GMC, Buick, Chevrolet, or Cadillac dealership had earlier replaced the warranty-eligible part. The cost of the replacement auto part(s) will be covered; labor is covered up to 2 years of original purchased part. Locate a dealer near you to take advantage of this valuable warranty and the expertise of our technicians, who receive exclusive training on your specific vehicle.

Locate a dealer near you to take advantage of this valuable warranty and the expertise of our technicians who receive exclusive training on your specific vehicle.

GREAT OFFERS FROM GMC CERTIFIED SERVICE

VIEW CURRENT OFFERS

Certified Service Technician installing wiper blade

PROFESSIONAL GRADE GMC PARTS ONLINE

GM Genuine Parts and ACDelco parts are now available to purchase online through participating sellers. Click to search and purchase the only parts for your GMC that are backed by General Motors.

SHOP ONLINE

INTRODUCING THE ALL-NEW MY GMC REWARDS^†

Unlock a world of appreciation that’s focused on you and your GMC vehicle. It’s all about making sure your journey with us gets better with time — from us, to you.

HOW IT WORKS