2021 Chevrolet Blazer Electrical Parts

This table covers the Active Noise Cancellation 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 Active Noise Cancellation Module parts for the 2021 Chevrolet Blazer come from GM GENUINE.

Part numbers include GM GENUINE 85144752 and GM GENUINE 85144751.

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

29 Alternator / Generator parts are listed for the 2021 Chevrolet Blazer, from PURE ENERGY, GM GENUINE, REMY and 8 other brands. GM GENUINE 85759062 carries the "Popular" badge. They are grouped as New and Remanufactured, with Remanufactured the largest group at 17 parts from PURE ENERGY, REMY, TERREPOWER and 4 other brands.

This table covers the Alternator / Generator bolts. Read more

2 Alternator / Generator Bolt parts for the 2021 Chevrolet Blazer come from GM GENUINE. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include GM GENUINE 11611102 and GM GENUINE 11589253.

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

7 Alternator / Generator Pulley parts for the 2021 Chevrolet Blazer come from 3 brands — LITENS, CONTINENTAL and DORMAN. The "Popular" part is LITENS 920060A.

Part numbers include LITENS 920060A, CONTINENTAL 49966 and CONTINENTAL 49968, among others listed above.

This table covers the Antenna 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 85774230.

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

This group shows a single part: GM GENUINE 13540633.

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

10 Battery parts for the 2021 Chevrolet Blazer come from 8 brands — DEKA, ACDELCO, BOSCH and 5 other brands. The "Popular" part is DEKA 9A48. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

In the AGM (Extended Life) grade, DEKA, ACDELCO, BOSCH and 4 other brands supply 9 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 9A48.

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 FT85094R.

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 8 Battery Cable parts for the 2021 Chevrolet Blazer. 1 part fits every engine; the other 7 are engine-specific.

Part numbers include GM GENUINE 84681646, GM GENUINE 84690949 and GM GENUINE 85525336, among others listed above.

This table covers the Battery Cable Terminal ends. Read more

This group shows a single part: GM GENUINE 84710785.

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 Chevrolet Blazer — STANDARD MOTOR PRODUCTS BSC123.

This table covers the Battery 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 Blazer — GM GENUINE 84155667.

This table covers the Battery Terminal Bolt nuts. Read more

One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 11610091.

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 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.

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 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.

This group includes GM GENUINE 22940857 and GM GENUINE 13534192.

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

2 Circuit Breaker parts for the 2021 Chevrolet Blazer come from 2 brands — BUSSMANN and GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

Part numbers include BUSSMANN CB21220 and GM GENUINE 84098783.

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

3 Engine Control Module (ECM Computer) parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE and ACDELCO.

Part numbers include ACDELCO 12700116, GM GENUINE 12726508 and GM GENUINE 12725663.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Blazer.

Listed part numbers: GM GENUINE 84826760 and GM GENUINE 84672986.

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 Chevrolet Blazer 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 Hands Free Vehicle Access 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 Chevrolet Blazer.

This group includes GM GENUINE 85039379 and GM GENUINE 23275430.

This table covers the brackets that mount the Hands Free Vehicle Access Module. 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 Blazer — GM GENUINE 42485326.

This table covers the Hands Free Vehicle Access 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

GM GENUINE supplies the 3 Hands Free Vehicle Access Sensor parts for the 2021 Chevrolet Blazer.

This group includes GM GENUINE 23366531, GM GENUINE 23366530 and GM GENUINE 85523854.

This table covers the HID Lighting ballasts. Read more

2 HID Lighting Ballast parts are listed for the 2021 Chevrolet Blazer, from DORMAN and ULTRA-POWER. All of them fit every engine offered in the 2021 Blazer.

This group includes DORMAN 601066 and the remaining parts above.

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

This group shows a single part: GM GENUINE 84782549.

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

GM GENUINE supplies the 3 Keyless Entry Module / Receiver parts for the 2021 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.

Listed part numbers: GM GENUINE 13540045, GM GENUINE 13558723 and GM GENUINE 13558725.

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

5 Keyless Entry Remote parts are listed for the 2021 Chevrolet Blazer, from GM GENUINE and DORMAN. GM GENUINE 13530712 carries the "Popular" badge. All of them fit every engine offered in the 2021 Blazer.

Listed part numbers: GM GENUINE 13530712, DORMAN 99756ST and GM GENUINE 13547829, plus the other parts above.

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

7 Parking Aid Sensor parts are listed for the 2021 Chevrolet Blazer, from TECHPRO, BOSCH, GM GENUINE and 1 other brand. BOSCH F00E270754 carries the "Popular" badge. All of them fit every engine offered in the 2021 Blazer.

Part numbers include BOSCH F00E270754, GM GENUINE 84586217 and TECHPRO GM1175105, among others listed 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

4 Power Supply Module (TIPM) parts for the 2021 Chevrolet Blazer come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

Listed part numbers: GM GENUINE 13438997, GM GENUINE 13510484 and GM GENUINE 23158670, plus the other parts above.

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 Chevrolet Blazer — 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 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.

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

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 for the 2021 Chevrolet Blazer come from 3 brands — GM GENUINE, DELPHI and STANDARD MOTOR PRODUCTS. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

Part numbers include DELPHI SS12406, GM GENUINE 24295280 and GM GENUINE 24298199, among others listed above.

This table covers the Speed Sensor Reluctor rings. Read more

2 Speed Sensor Reluctor Ring parts for the 2021 Chevrolet Blazer come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

This group includes GM GENUINE 24230744 and GM GENUINE 24061032.

This table covers the Starter bolts. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Blazer. 1 part fits every engine; the other 1 is engine-specific.

Listed part numbers: GM GENUINE 11588726 and GM GENUINE 11588740.

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

18 Starter Motor parts are listed for the 2021 Chevrolet Blazer, from PURE ENERGY, FVP, GM GENUINE and 6 other brands. GM GENUINE 12667973 carries the "Popular" badge.

In the New grade, GM GENUINE, TYC, WAI GLOBAL and 1 other brand supply 7 parts: brand-new units rather than rebuilt ones. A representative part number is GM GENUINE 12667973.

In the Remanufactured grade, PURE ENERGY, FVP, REMY and 2 other brands supply 11 parts: factory-rebuilt units with new wear components. A representative part number is ACDELCO 3362275A.

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

This group shows a single part: GM GENUINE 12654121.

This table covers the Video control modules. Read more

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

Part numbers include GM GENUINE 86534153 and GM GENUINE 86532507.