2021 GMC Sierra 2500 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

6 Alternator / Generator parts are listed for the 2021 GMC Sierra 2500, from GM GENUINE, FVP, PURE ENERGY and 1 other brand. GM GENUINE 85671415 carries the "Popular" badge.

In the New grade, GM GENUINE supplies 2 parts: brand-new units rather than rebuilt ones. A representative part number is GM GENUINE 85671415.

In the Remanufactured grade, FVP, PURE ENERGY and TERREPOWER supply 4 parts: factory-rebuilt units with new wear components. A representative part number is FVP 10394.

This group includes GM GENUINE 85671415, GM GENUINE 13563314 and FVP 10394 and the remaining parts above.

This table covers the brackets that mount the Alternator / Generator. 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

One part is listed for the 2021 GMC Sierra 2500 — GM GENUINE 97356246.

This table covers the Alternator / Generator bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles. Read more

GM GENUINE supplies both parts for the 2021 GMC Sierra 2500.

This group includes GM GENUINE 12624586 and GM GENUINE 12623219.

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

3 Alternator / Generator Pulley parts for the 2021 GMC Sierra 2500 come from 2 brands — LITENS and CONTINENTAL.

Listed part numbers: CONTINENTAL 49903, LITENS 920112A and LITENS 920111A.

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

2 Anti-Theft Control Module parts for the 2021 GMC Sierra 2500 come from GM GENUINE.

Listed part numbers: 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

7 Battery parts for the 2021 GMC Sierra 2500 come from 6 brands — FVP, DEKA, LUCAS and 3 other brands. The "Popular" part is DEKA 9A48.

Listed part numbers: DEKA 9A48, LUCAS LBAGM004A and ACDELCO 48AGM, plus the other parts above.

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

GM GENUINE supplies the 5 Battery Cable parts for the 2021 GMC Sierra 2500. GM GENUINE 84794790 carries the "Popular" badge.

Listed part numbers: GM GENUINE 84794790, GM GENUINE 87866332 and GM GENUINE 84772924, plus the other parts above.

This table covers the Battery Cable Terminal ends. Read more

This group shows a single part: GM GENUINE 84335255.

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

One part is listed for the 2021 GMC Sierra 2500 — STANDARD MOTOR PRODUCTS SBC111.

This table covers the Battery Terminal Bolt nuts. Read more

One part is listed for the 2021 GMC Sierra 2500 — 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

HELLA supplies both parts for the 2021 GMC Sierra 2500.

Part numbers include HELLA 013068241 and HELLA 013068041.

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

GM GENUINE supplies both parts for the 2021 GMC Sierra 2500.

This group includes GM GENUINE 13531840 and GM GENUINE 84652297.

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

2 Circuit Breaker parts for the 2021 GMC Sierra 2500 come from STANDARD MOTOR PRODUCTS.

Listed part numbers: STANDARD MOTOR PRODUCTS FH58 and STANDARD MOTOR PRODUCTS FH59.

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

One part is listed for the 2021 GMC Sierra 2500 — GM GENUINE 12720006.

This table covers the replacement fuses for this vehicle's fuse boxes. Typical signs include one circuit dead while its neighbor still works, or a fuse that blows again as soon as you replace it. Match amperage and fuse type. A repeat blow means a short — find it before the next fuse. Read more

43 Fuse parts for the 2021 GMC Sierra 2500 come from 3 brands — GM GENUINE, BUSSMANN and ACDELCO. The "Popular" part is GM GENUINE 15305191. 10 Amp, 100 Amp, 125 Amp, 15 Amp, 150 Amp, 175 Amp, 2 Amp, 20 Amp, 225 Amp, 25 Amp, 250 Amp, 3 Amp, 30 Amp, 300 Amp, 350 Amp, 4 Amp, 40 Amp, 450 Amp, 5 Amp, 50 Amp, 60 Amp, 7.5 Amp and 70 Amp are all represented, and 25 Amp alone accounts for 5 parts.

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

This group shows a single part: GM GENUINE 85130076.

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

GM GENUINE supplies both parts for the 2021 GMC Sierra 2500.

Listed part numbers: GM GENUINE 84655051 and GM GENUINE 84735810.

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

GM GENUINE supplies both parts for the 2021 GMC Sierra 2500.

This group includes GM GENUINE 13523298 and GM GENUINE 13558725.

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

8 Keyless Entry Remote parts are listed for the 2021 GMC Sierra 2500, from GM GENUINE and DORMAN. GM GENUINE 22881479 carries the "Popular" badge.

Part numbers include GM GENUINE 22881479, GM GENUINE 84209236 and DORMAN 99444ST, among others listed above.

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

One part is listed for the 2021 GMC Sierra 2500 — 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

This group shows a single part: 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

4 Parking Aid Sensor parts are listed for the 2021 GMC Sierra 2500, from BOSCH, GM GENUINE, STANDARD MOTOR PRODUCTS and 1 other brand.

Part numbers include BOSCH F00E270754, GM GENUINE 84586217 and STANDARD MOTOR PRODUCTS PPS159, among others listed above.

This table covers the brackets that mount the Parking Aid Sensor. 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

11 Parking Aid Sensor Bracket parts are listed for the 2021 GMC Sierra 2500, from GM GENUINE, TECHPRO and VARIOUS MFR. GM GENUINE 84695397 carries the "Popular" badge.

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

2 Power Supply Module (TIPM) parts for the 2021 GMC Sierra 2500 come from GM GENUINE.

Part numbers include GM GENUINE 84379747 and GM GENUINE 84601806.

This table covers the Power Take Off (PTO) control modules. Read more

One part is listed for the 2021 GMC Sierra 2500 — GM GENUINE 84741097.

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

One part is listed for the 2021 GMC Sierra 2500 — 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

GM GENUINE supplies both parts for the 2021 GMC Sierra 2500.

This group includes GM GENUINE 84729106 and GM GENUINE 84729107.

This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor. Read more

9 Speed Sensor parts for the 2021 GMC Sierra 2500 come from 4 brands — STANDARD MOTOR PRODUCTS, GM GENUINE, HOLSTEIN and 1 other brand. The "Popular" part is HOLSTEIN 2VSS0527.

The Economy section lists 1 option from HOLSTEIN — the catalog's value-priced group. HOLSTEIN 2VSS0527 is listed in this group.

In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, GM GENUINE and DELPHI supply 8 parts: built to original-equipment specification. A representative part number is DELPHI SS12245.

Part numbers include HOLSTEIN 2VSS0527, DELPHI SS12245 and GM GENUINE 24052278, among others listed above.

This table covers the Starter bolts. Read more

3 Starter Bolt parts are listed for the 2021 GMC Sierra 2500, from GM GENUINE and DORMAN.

Part numbers include DORMAN 72004, GM GENUINE 97329632 and GM GENUINE 11610633.

This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

5 Starter Motor parts are listed for the 2021 GMC Sierra 2500, from GM GENUINE, WAI GLOBAL, FVP and 2 other brands. GM GENUINE 12721714 carries the "Popular" badge.

New: 2 parts, from GM GENUINE and WAI GLOBAL. A representative part number is GM GENUINE 12721714.

Remanufactured: 3 parts, from FVP, PURE ENERGY and TERREPOWER. A representative part number is FVP 12872.

This group includes GM GENUINE 12721714, WAI GLOBAL 31010N and FVP 12872 and the remaining parts above.

This table covers the Video control modules. Read more

One part is listed for the 2021 GMC Sierra 2500 — GM GENUINE 84995709.

This table covers the Wiring Harness clips. Read more

One part is listed for the 2021 GMC Sierra 2500 — GM GENUINE 12337820.