2021 GMC Sierra 1500 Electrical Parts

This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator. Read more

21 Alternator / Generator parts for the 2021 GMC Sierra 1500 come from 7 brands — PURE ENERGY, GM GENUINE, FVP and 4 other brands. The "Popular" part is GM GENUINE 13563315.

The New section lists 6 options from GM GENUINE, SKP and WAI GLOBAL — brand-new units rather than rebuilt ones. GM GENUINE 13563315 is listed in this group.

The Remanufactured section lists 15 options from PURE ENERGY, FVP, REMY and 1 other brand — factory-rebuilt units with new wear components. FVP 11818 is listed in this group.

This table covers the Alternator / Generator bolts. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 1500.

Part numbers include GM GENUINE 11611102 and GM GENUINE 11611384.

This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

5 Alternator / Generator Pulley parts are listed for the 2021 GMC Sierra 1500, from CONTINENTAL and LITENS.

Part numbers include CONTINENTAL 48700, CONTINENTAL 49910 and CONTINENTAL 49913, among others listed above.

This table covers the Anti-Theft control modules. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 1500.

This group includes GM GENUINE 13516351 and GM GENUINE 13516352.

This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery. Read more

20 Battery parts are listed for the 2021 GMC Sierra 1500, from ACDELCO, DEKA, LUCAS and 6 other brands. DEKA 9A48 carries the "Popular" badge.

The AGM (Extended Life) section lists 18 options from ACDELCO, DEKA, LUCAS and 5 other brands — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. DEKA 9A48 is listed in this group.

The Performance AGM (Extended Life + Increased Power) section lists 2 options from FULLRIVER — grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. FULLRIVER FT85094R is listed in this group.

This table covers the positive and ground cables that run from the battery. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early. Read more

8 Battery Cable parts for the 2021 GMC Sierra 1500 come from GM GENUINE. The "Popular" part is GM GENUINE 84794790.

Listed part numbers: GM GENUINE 84794790, GM GENUINE 84362745 and GM GENUINE 84602526, plus the other parts above.

This table covers the Battery Cable Terminal ends. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 84406836.

This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

4 Battery Current Sensor parts for the 2021 GMC Sierra 1500 come from 3 brands — STANDARD MOTOR PRODUCTS, HELLA and WELLS.

This group includes HELLA 012767491, STANDARD MOTOR PRODUCTS BSC150 and STANDARD MOTOR PRODUCTS BSC122 and the remaining parts above.

This table covers the Battery Terminal Bolt nuts. Read more

2 Battery Terminal Bolt / Nut parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 11546389 and GM GENUINE 11570961.

This table covers the Blind Spot Detection sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

2 Blind Spot Detection Sensor parts for the 2021 GMC Sierra 1500 come from HELLA.

This group includes HELLA 013068241 and HELLA 013068041.

This table covers the body-control modules that run lighting, locks and wipers. Read more

2 Body Control Module (BCM) parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 13531840 and GM GENUINE 84652297.

This table covers the resettable circuit breakers in this vehicle's electrical system. Read more

3 Circuit Breaker parts are listed for the 2021 GMC Sierra 1500, from STANDARD MOTOR PRODUCTS and GM GENUINE.

Listed part numbers: GM GENUINE 84215440, STANDARD MOTOR PRODUCTS FH58 and STANDARD MOTOR PRODUCTS FH59.

This table covers the engine-control modules that run fuel, spark and emissions. Read more

This group shows a single part: GM GENUINE 12725132.

This table covers the brackets that mount the Engine Control Module (ECM Computer). Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

3 Engine Control Module (ECM Computer) Bracket parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 85122981, GM GENUINE 85116412 and GM GENUINE 85167085.

This table covers the fuse blocks that hold this vehicle's fuses. Read more

2 Fuse Block parts for the 2021 GMC Sierra 1500 come from DORMAN.

Part numbers include DORMAN 956122 and DORMAN 956120.

This table covers the horns mounted in the front of the vehicle. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 85587715.

This table covers the Jumper cables. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early. Read more

This group shows a single part: GM GENUINE 85012025.

This table covers the receivers that pick up the key-fob unlock signal. Read more

5 Keyless Entry Module / Receiver parts for the 2021 GMC Sierra 1500 come from GM GENUINE. The "Popular" part is GM GENUINE 13523298.

Part numbers include GM GENUINE 13523298, GM GENUINE 13558725 and GM GENUINE 84441407, among others listed above.

This table covers the key fobs that lock, unlock and start the vehicle. Read more

7 Keyless Entry Remote parts for the 2021 GMC Sierra 1500 come from 2 brands — GM GENUINE and DORMAN. The "Popular" part is GM GENUINE 13547803.

Part numbers include GM GENUINE 13547803, GM GENUINE 84209236 and DORMAN 99444ST, among others listed above.

This table covers the replacement shells for the key fob. Read more

This group shows a single part: DORMAN 95642.

This table covers the Park Assist (PAS) Camera modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 84716060.

This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors. Read more

5 Parking Aid Sensor parts for the 2021 GMC Sierra 1500 come from 4 brands — TECHPRO, GM GENUINE, BOSCH and 1 other brand. The "Popular" part is GM GENUINE 84586217.

This group includes GM GENUINE 84586217, BOSCH F00E270754 and STANDARD MOTOR PRODUCTS PPS159 and the remaining parts above.

This table covers the totally-integrated power modules that distribute body electrical power. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

GM GENUINE supplies the 3 Power Supply Module (TIPM) parts for the 2021 GMC Sierra 1500.

Listed part numbers: GM GENUINE 84379747, GM GENUINE 13510484 and GM GENUINE 84601806.

This table covers the Serial Data Gateway modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

This group shows a single part: GM GENUINE 13533490.

This table covers the Side Object Sensor modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years. Read more

2 Side Object Sensor Module parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 84729106 and GM GENUINE 84729107.