2021 Chevrolet Trailblazer 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 Chevrolet Trailblazer, from GM GENUINE, PURE ENERGY, BOSCH and 3 other brands. GM GENUINE 42911849 carries the "Popular" badge.

In the New grade, GM GENUINE supplies 1 part: brand-new units rather than rebuilt ones. A representative part number is GM GENUINE 42911849.

In the Remanufactured grade, PURE ENERGY, BOSCH, FVP and 2 other brands supply 5 parts: factory-rebuilt units with new wear components. A representative part number is PURE ENERGY 10383.

Listed part numbers: GM GENUINE 42911849, PURE ENERGY 10383 and BOSCH AL7836X, plus the other parts above.

This table covers the Alternator / Generator bolts. Read more

This group shows a single part: GM GENUINE 11611102.

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

2 Alternator / Generator Pulley parts for the 2021 Chevrolet Trailblazer come from 2 brands — CONTINENTAL and LITENS.

Part numbers include CONTINENTAL 48704 and LITENS 920136A.

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

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

Part numbers include GM GENUINE 13520524 and GM GENUINE 13520523.

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 Chevrolet Trailblazer come from 6 brands — ACDELCO, DEKA, LUCAS and 3 other brands. The "Popular" part is DEKA 9A48.

This group includes DEKA 9A48, LUCAS LBAGM004A and ACDELCO 48AGM 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

One part is listed for the 2021 Chevrolet Trailblazer — GM GENUINE 42776666.

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

2 Battery Current Sensor parts are listed for the 2021 Chevrolet Trailblazer, from HELLA and STANDARD MOTOR PRODUCTS.

This group includes HELLA 012767491 and STANDARD MOTOR PRODUCTS BSC122.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Trailblazer.

This group includes GM GENUINE 22940857 and GM GENUINE 13534192.

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 Trailblazer — GM GENUINE 60004851.

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

This group shows a single part: GM GENUINE 84098784.

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

One part is listed for the 2021 Chevrolet Trailblazer — GM GENUINE 42553328.

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 Trailblazer — GM GENUINE 42766894.

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 Trailblazer 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

One part is listed for the 2021 Chevrolet Trailblazer — GM GENUINE 85039379.

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

One part is listed for the 2021 Chevrolet Trailblazer — GM GENUINE 85518160.

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

This group shows a single part: GM GENUINE 60008889.

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

GM GENUINE supplies the 5 Keyless Entry Module / Receiver parts for the 2021 Chevrolet Trailblazer. GM GENUINE 13558725 carries the "Popular" badge.

This group includes GM GENUINE 13558725, GM GENUINE 13540045 and GM GENUINE 13558722 and the remaining parts above.

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 Trailblazer, from GM GENUINE and DORMAN. GM GENUINE 13530712 carries the "Popular" badge.

This group includes GM GENUINE 13530712, GM GENUINE 13547829 and DORMAN 99756ST and the remaining 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

4 Parking Aid Sensor parts are listed for the 2021 Chevrolet Trailblazer, from TECHPRO, BOSCH and GM GENUINE.

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

3 Power Supply Module (TIPM) parts for the 2021 Chevrolet Trailblazer come from GM GENUINE.

Part numbers include GM GENUINE 13438997, GM GENUINE 13510484 and GM GENUINE 42601710.

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 Trailblazer — GM GENUINE 13534928.

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 Trailblazer.

Part numbers include GM GENUINE 84182642 and GM GENUINE 84182643.

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

7 Speed Sensor parts for the 2021 Chevrolet Trailblazer come from 2 brands — STANDARD MOTOR PRODUCTS and GM GENUINE. The "Popular" part is GM GENUINE 24295280.

Part numbers include GM GENUINE 24295280, GM GENUINE 24298199 and GM GENUINE 24287098, among others listed above.

This table covers the Speed Sensor Reluctor rings. Read more

2 Speed Sensor Reluctor Ring parts for the 2021 Chevrolet Trailblazer come from GM GENUINE.

This group includes GM GENUINE 24230744 and GM GENUINE 24061032.

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

4 Starter Motor parts are listed for the 2021 Chevrolet Trailblazer, from GM GENUINE, BOSCH, FVP and 1 other brand.

New: 1 part, from GM GENUINE. A representative part number is GM GENUINE 12697399.

Remanufactured: 3 parts, from BOSCH, FVP and PURE ENERGY. A representative part number is BOSCH SR6564X.

Listed part numbers: GM GENUINE 12697399, BOSCH SR6564X and FVP 12861, plus the other parts above.