Most Replaced Parts on the T1 GMC Sierra 1500 (2019-2023)

The Sierra 1500 T1 ran from 2019-2023 and is MultiPro tailgate, available CarbonPro bed. After enough of these come across the parts counter you start to see the same short list of components over and over. Here is what owners of this generation actually end up buying, and what to know before you order.

Brakes

The usual tell is a grinding noise, which means the friction material is already gone. Heat is the accelerant on this one, which is why it shows up faster here than up north.

Common parts in this group: brake pads, brake rotors, brake calipers, brake hoses, wheel speed sensors.

Worth knowing: GM friction material is matched to the specific rotor metallurgy and the ABS calibration on your vehicle.

Drivetrain and Transfer Case

The usual tell is vibration that appears above 55 mph and grows with speed. Owners who do mostly short trips see this sooner than the mileage suggests.

Common parts in this group: transfer case encoder motors, front differential actuators, u-joints, CV axles, driveshaft center bearings.

Worth knowing: Wheel bearings on modern GM trucks carry the wheel speed sensor in the same assembly, and sensor tolerance affects ABS and stability control.

Ignition and Engine Management

The usual tell is a misfire code that follows the coil when you swap it to another cylinder. How the vehicle gets used moves this interval more than the odometer does.

Common parts in this group: spark plugs, ignition coils, camshaft position sensors, crankshaft position sensors, oxygen sensors.

Worth knowing: Plug gap, heat range and electrode material are specified per engine, and GM’s Active Fuel Management and Dynamic Fuel Management engines are sensitive to it.

Electrical and Charging

The usual tell is the auto stop-start feature quietly deactivating itself. Worth checking at the same time you rotate tires, since the wheel is already off.

Common parts in this group: batteries, battery cables, alternators, starters, body control modules.

Worth knowing: Auxiliary and stop-start systems use AGM batteries, and dropping a flooded battery in is a short path to a repeat failure.

Exhaust and Emissions

The usual tell is a check engine light that appears after fueling and clears itself. Catch it early and it is a parts bill. Ignore it and it becomes a parts and labor bill.

Common parts in this group: catalytic converters, oxygen sensors, DEF injectors, diesel particulate filters, EVAP purge valves.

Worth knowing: EVAP components are leak-rate sensitive, and the monitor is comparing against a factory reference.

Sensors, Cameras and Driver Assistance

The usual tell is a TPMS light that will not clear after a tire rotation. Catch it early and it is a parts bill. Ignore it and it becomes a parts and labor bill.

Common parts in this group: park assist sensors, backup cameras, blind zone modules, front camera modules, radar sensors.

Worth knowing: These are calibrated devices, and the calibration lives in the module that expects a specific sensor.

Before You Order

Have the VIN ready. On a Sierra 1500 the same model year can carry two or three different engines and several suspension packages.
Check the SPID label in the glove box or console for your RPO codes.
Front and rear parts are rarely the same number, even when they look identical.
If the part is electrical, confirm the fit before you order. Electrical parts are not returnable at any GM dealer, including us.

We are a factory GM dealer, not a reseller, so what you order is the same part the service drive installs. Browse our GMC OEM parts catalog or search for Sierra 1500 parts.