2021 Chevrolet Express 4500 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

19 Alternator / Generator parts for the 2021 Chevrolet Express 4500 come from 10 brands — GM GENUINE, PURE ENERGY, TERREPOWER and 7 other brands. The "Popular" part is GM GENUINE 13563314.

The New section lists 5 options from GM GENUINE, SKP and WAI GLOBAL — brand-new units rather than rebuilt ones. GM GENUINE 13563314 is listed in this group.

The Remanufactured section lists 14 options from PURE ENERGY, TERREPOWER, BOSCH and 4 other brands — factory-rebuilt units with new wear components. ACDELCO 3343200A is listed in this group.

This table covers the Alternator / Generator bolts. Read more

One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 11611384.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Express 4500.

Listed part numbers: 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 4500 — GM GENUINE 13498957.

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

One part is listed for the 2021 Chevrolet Express 4500 — 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 4500, from DEKA, ACDELCO, FVP and 1 other brand. DEKA 9A78DT carries the "Popular" badge.

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.

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

3 Battery Cable parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

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

This table covers the Battery Terminal Bolt nuts. Read more

3 Battery Terminal Bolt / Nut parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

Part numbers include GM GENUINE 19115561, GM GENUINE 11570961 and GM GENUINE 11609585.

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

One part is listed for the 2021 Chevrolet Express 4500 — 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 4500 come from GM GENUINE.

Part numbers include 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

This group shows a single part: 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

This group shows a single part: 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 4500 — 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 4500 — GM GENUINE 84594590.

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

One part is listed for the 2021 Chevrolet Express 4500 — 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

3 Keyless Entry Remote parts for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and DORMAN.

This group includes DORMAN 99162, GM GENUINE 22936099 and GM GENUINE 22936098.

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 4500 — GM GENUINE 22743052.

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 4500 — GM GENUINE 84393460.

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

One part is listed for the 2021 Chevrolet Express 4500 — DELPHI SS12245.

This table covers the Starter bolts. Read more

2 Starter Bolt parts for the 2021 Chevrolet Express 4500 come from GM GENUINE.

Part numbers include 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

7 Starter Motor parts for the 2021 Chevrolet Express 4500 come from 7 brands — GM GENUINE, TYC, WAI GLOBAL and 4 other brands. The "Popular" part is GM GENUINE 12740951.

The New section: 3 options from GM GENUINE, TYC and WAI GLOBAL. GM GENUINE 12740951 is listed in this group.

The Remanufactured section: 4 options from FVP, PURE ENERGY, REMY and 1 other brand. FVP 12817 is listed in this group.

Listed part numbers: GM GENUINE 12740951, TYC 116029 and WAI GLOBAL 31010N, plus the other parts above.

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 4500 — GM GENUINE 87845214.