2021 Chevrolet Express 3500 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

18 Alternator / Generator parts are listed for the 2021 Chevrolet Express 3500, from GM GENUINE, PURE ENERGY, TERREPOWER and 6 other brands. GM GENUINE 13563314 carries the "Popular" badge.

In the New grade, GM GENUINE, WAI GLOBAL and SKP supply 6 parts: brand-new units rather than rebuilt ones. A representative part number is GM GENUINE 13563314.

In the Remanufactured grade, PURE ENERGY, TERREPOWER, FVP and 3 other brands supply 12 parts: factory-rebuilt units with new wear components. A representative part number is ACDELCO 3343200A.

This table covers the Alternator / Generator bolts. Read more

This group shows a single part: 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

This group shows a single part: LITENS 920112A.

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

2 Anti-Theft Control Module parts for the 2021 Chevrolet Express 3500 come from GM GENUINE.

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

This group shows a single part: GM GENUINE 13498957.

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

This group shows a single part: 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 for the 2021 Chevrolet Express 3500 come from 4 brands — DEKA, ACDELCO, FVP and 1 other brand. The "Popular" part is DEKA 9A78DT.

In the AGM (Extended Life) grade, DEKA, ACDELCO and FVP supply 4 parts: grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. A representative part number is DEKA 9A78DT.

In the Performance AGM (Extended Life + Increased Power) grade, FULLRIVER supplies 1 part: grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. A representative part number is FULLRIVER FT82578.

Part numbers include DEKA 9A78DT, ACDELCO 78XAGM and DEKA 9A78, among others listed 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 3 Battery Cable parts for the 2021 Chevrolet Express 3500.

Listed part numbers: GM GENUINE 22777054, GM GENUINE 85534595 and GM GENUINE 85597825.

This table covers the Battery Terminal Bolt nuts. Read more

GM GENUINE supplies the 3 Battery Terminal Bolt / Nut parts for the 2021 Chevrolet Express 3500.

This group includes GM GENUINE 19115561, GM GENUINE 11570961 and GM GENUINE 11609585.

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

This group shows a single part: GM GENUINE 12010050.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 3500.

Listed part numbers: 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

One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 23231327.

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

One part is listed for the 2021 Chevrolet Express 3500 — 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

One part is listed for the 2021 Chevrolet Express 3500 — 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

This group shows a single part: BUSSMANN ATM2.

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

One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 15151221.

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

This group shows a single part: GM GENUINE 84594590.

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

This group shows a single part: GM GENUINE 25889495.

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

One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 20863945.

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

6 Keyless Entry Remote parts are listed for the 2021 Chevrolet Express 3500, from GM GENUINE and DORMAN. DORMAN 99162 carries the "Popular" badge.

Listed part numbers: DORMAN 99162, GM GENUINE 22936098 and GM GENUINE 22849638, 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

This group shows a single part: 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

6 Parking Aid Sensor parts are listed for the 2021 Chevrolet Express 3500, from BOSCH, STANDARD MOTOR PRODUCTS, GM GENUINE and 3 other brands. BOSCH 0263043551 carries the "Popular" badge.

Part numbers include BOSCH 0263043551, STANDARD MOTOR PRODUCTS PPS44 and GM GENUINE 15239247, 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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 3500.

Listed part numbers: 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

This group shows a single part: 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

One part is listed for the 2021 Chevrolet Express 3500 — 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

2 Speed Sensor parts for the 2021 Chevrolet Express 3500 come from 2 brands — HOLSTEIN and DELPHI.

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, DELPHI supplies 1 part: built to original-equipment specification. A representative part number is DELPHI SS12245.

This group includes HOLSTEIN 2VSS0527 and DELPHI SS12245.

This table covers the Starter bolts. Read more

3 Starter Bolt parts are listed for the 2021 Chevrolet Express 3500, from GM GENUINE and DORMAN.

This group includes 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

9 Starter Motor parts are listed for the 2021 Chevrolet Express 3500, from BOSCH, GM GENUINE, TYC and 5 other brands. GM GENUINE 12740951 carries the "Popular" badge.

New: 4 parts, from GM GENUINE, TYC, BOSCH and 1 other brand. A representative part number is GM GENUINE 12740951.

Remanufactured: 5 parts, from BOSCH, FVP, PURE ENERGY and 2 other brands. A representative part number is BOSCH SR8596X.

Part numbers include GM GENUINE 12740951, TYC 116029 and BOSCH SR8596N, among others listed above.

This table covers the Wiring Harness clips. Read more

One part is listed for the 2021 Chevrolet Express 3500 — 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

This group shows a single part: GM GENUINE 87845214.