2021 Chevrolet Express 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

32 Alternator / Generator parts for the 2021 Chevrolet Express 2500 come from 9 brands — GM GENUINE, TERREPOWER, PURE ENERGY and 6 other brands. The "Popular" part is GM GENUINE 84331735. New and Remanufactured are all represented, and Remanufactured alone accounts for 20 parts.

This table covers the Alternator / Generator bolts. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 11611384.

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

This group shows a single part: GM GENUINE 12624586.

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

One part is listed for the 2021 Chevrolet Express 2500 — LITENS 920112A.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 2500. All of them fit every engine offered in the 2021 Express 2500.

This group includes GM GENUINE 20901252 and GM GENUINE 84209962.

This table covers the Automatic Headlamp 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 Chevrolet Express 2500 — GM GENUINE 13498957.

This table covers the backup alarms that sound in reverse. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 23239058.

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

5 Battery parts are listed for the 2021 Chevrolet Express 2500, from DEKA, ACDELCO, FVP and 1 other brand. DEKA 9A78DT carries the "Popular" badge. All of them fit every engine offered in the 2021 Express 2500.

The AGM (Extended Life) section lists 4 options from DEKA, ACDELCO and FVP — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. DEKA 9A78DT is listed in this group.

The Performance AGM (Extended Life + Increased Power) section lists 1 option from FULLRIVER — grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. FULLRIVER FT82578 is listed in this group.

This group includes DEKA 9A78DT, ACDELCO 78XAGM and DEKA 9A78 and the remaining 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

11 Battery Cable parts for the 2021 Chevrolet Express 2500 come from 2 brands — GM GENUINE and ACDELCO. The "Popular" part is GM GENUINE 84884431. 1 part fits every engine; the other 10 are engine-specific.

This table covers the Battery Terminal Bolt nuts. Read more

4 Battery Terminal Bolt / Nut parts for the 2021 Chevrolet Express 2500 come from GM GENUINE. 3 parts fit every engine; the other 1 is engine-specific.

This group includes GM GENUINE 19115561, GM GENUINE 11570961 and GM GENUINE 11609585 and the remaining parts above.

This table covers the covers that protect battery terminals. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 12010050.

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

2 Body Control Module (BCM) parts for the 2021 Chevrolet Express 2500 come from GM GENUINE. Every part fits all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8).

This group includes GM GENUINE 84922494 and GM GENUINE 22915542.

This table covers the brackets that mount the Body Control Module (BCM). 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

This group shows a single part: GM GENUINE 23231327.

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

2 Engine Control Module (ECM Computer) parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

Part numbers include GM GENUINE 12721353 and GM GENUINE 12725133.

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

2 Engine Control Module (ECM Computer) Bracket parts for the 2021 Chevrolet Express 2500 come from GM GENUINE.

Listed part numbers: GM GENUINE 84300054 and GM GENUINE 84461892.

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

One part is listed for the 2021 Chevrolet Express 2500 — BUSSMANN ATM2.

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

This group shows a single part: GM GENUINE 15151221.

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

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 84594590.

This table covers the horn contacts in the steering column. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 25889495.

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

This group shows a single part: GM GENUINE 20863945.

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

4 Keyless Entry Remote parts for the 2021 Chevrolet Express 2500 come from GM GENUINE. Every part fits all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8).

Listed part numbers: GM GENUINE 22849638, GM GENUINE 20877108 and GM GENUINE 22953234, plus the other parts above.

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 Chevrolet Express 2500 — GM GENUINE 22743052.

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 Chevrolet Express 2500 come from 5 brands — BOSCH, GM GENUINE, HELLA and 2 other brands. The "Popular" part is BOSCH 0263043551. Every part fits all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8).

This group includes BOSCH 0263043551, GM GENUINE 15239247 and HELLA 358141551 and the remaining parts 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

2 Parking Aid Sensor Bracket parts for the 2021 Chevrolet Express 2500 come from GM GENUINE. Every part fits all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8).

This group includes GM GENUINE 22801410 and GM GENUINE 22801411.

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

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 84393460.

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

This group shows a single part: GM GENUINE 84434829.

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

4 Speed Sensor parts are listed for the 2021 Chevrolet Express 2500, from HOLSTEIN, VEMO, DELPHI and 1 other brand.

In the Economy grade, HOLSTEIN and VEMO supply 2 parts: the catalog's value-priced group. A representative part number is HOLSTEIN 2VSS0527.

The Standard Replacement section lists 2 options from DELPHI and GM GENUINE — built to original-equipment specification. DELPHI SS12245 is listed in this group.

Part numbers include HOLSTEIN 2VSS0527, VEMO V51720313 and DELPHI SS12245, among others listed above.

This table covers the Starter bolts. Read more

3 Starter Bolt parts for the 2021 Chevrolet Express 2500 come from 2 brands — GM GENUINE and DORMAN. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: DORMAN 72004, GM GENUINE 11588740 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

23 Starter Motor parts for the 2021 Chevrolet Express 2500 come from 7 brands — WAI GLOBAL, REMY, TERREPOWER and 4 other brands. The "Popular" part is GM GENUINE 24588465.

The New section lists 10 options from GM GENUINE, WAI GLOBAL, TYC and 2 other brands — brand-new units rather than rebuilt ones. GM GENUINE 24588465 is listed in this group.

The Remanufactured section lists 13 options from TERREPOWER, FVP, PURE ENERGY and 2 other brands — factory-rebuilt units with new wear components. TERREPOWER 52108 is listed in this group.

This table covers the Starter Motor Heat shields. Typical signs include a bent shield rubbing a rotor, or rust-through that leaves the backing open. A rubbing shield will eat a new rotor. Straighten or replace it before the wheel goes back on. Read more

One part is listed for the 2021 Chevrolet Express 2500 — GM GENUINE 12633476.

This table covers the Wiring Harness clips. Read more

This group shows a single part: GM GENUINE 12337820.

This table covers the Yaw 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 Chevrolet Express 2500 — GM GENUINE 87845214.