2021 Cadillac CT4 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

5 Alternator / Generator parts are listed for the 2021 Cadillac CT4, from GM GENUINE, FVP, PURE ENERGY and 2 other brands. GM GENUINE 13563315 carries the "Popular" badge. All of them fit every engine offered in the 2021 CT4.

In the New grade, GM GENUINE supplies 1 part: brand-new units rather than rebuilt ones. A representative part number is GM GENUINE 13563315.

In the Remanufactured grade, FVP, PURE ENERGY, REMY and 1 other brand supply 4 parts: factory-rebuilt units with new wear components. A representative part number is FVP 11818.

Listed part numbers: GM GENUINE 13563315 and FVP 11818, 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 Cadillac CT4 come from 2 brands — CONTINENTAL and LITENS. Every part fits both the 2.0L L4 Turbocharged and the 2.7L L4 Turbocharged.

Listed part numbers: CONTINENTAL 48700 and LITENS 920114A.

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

11 Battery parts for the 2021 Cadillac CT4 come from 8 brands — DEKA, FVP, ACDELCO and 5 other brands. The "Popular" part is DEKA 9A48. Every part fits both the 2.0L L4 Turbocharged and the 2.7L L4 Turbocharged.

In the AGM (Extended Life) grade, DEKA, FVP, ACDELCO and 4 other brands supply 10 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

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 86801288.

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 Cadillac CT4 — STANDARD MOTOR PRODUCTS BSC150.

This table covers the clamps and brackets that secure the battery. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 11609585.

This table covers the Battery Vent tubes. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 85665279.

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

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 13548775.

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 Cadillac CT4 — GM GENUINE 84930206.

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

This group shows a single part: GM GENUINE 84215440.

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

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12726539.

This table covers the Engine Control Module (ECM Computer) bolts. Read more

This group shows a single part: GM GENUINE 11519377.

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 Cadillac CT4 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 horns mounted in the front of the vehicle. Read more

2 Horn parts for the 2021 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 84849439 and GM GENUINE 84849440.

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

7 Keyless Entry Remote parts are listed for the 2021 Cadillac CT4, from GM GENUINE and DORMAN. DORMAN 99762ST carries the "Popular" badge.

Listed part numbers: DORMAN 99762ST, GM GENUINE 13560906 and GM GENUINE 85043351, plus the other parts above.

This table covers the Lane Departure 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 Cadillac CT4 — GM GENUINE 86517920.

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

2 Park Assist (PAS) Camera Module parts for the 2021 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 84761801 and GM GENUINE 84761800.

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 Cadillac CT4, from BOSCH, GM GENUINE, STANDARD MOTOR PRODUCTS and 1 other brand.

Part numbers include BOSCH F00E270754, GM GENUINE 84586217 and STANDARD MOTOR PRODUCTS PPS159, 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 Cadillac CT4.

This group includes GM GENUINE 84637866 and GM GENUINE 84637867.

This table covers the Rain 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 both parts for the 2021 Cadillac CT4.

Part numbers include GM GENUINE 85880857 and GM GENUINE 86379076.

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 Cadillac CT4 — GM GENUINE 13542886.

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 the 4 Side Object Sensor Module parts for the 2021 Cadillac CT4.

This group includes GM GENUINE 85826110, GM GENUINE 85826109 and GM GENUINE 86558606 and the remaining parts above.

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

8 Speed Sensor parts for the 2021 Cadillac CT4 come from 2 brands — GM GENUINE and STANDARD MOTOR PRODUCTS. The "Popular" part is GM GENUINE 24299509.

Part numbers include GM GENUINE 24299509, GM GENUINE 24043446 and GM GENUINE 24060865, among others listed above.

This table covers the Speed Sensor Reluctor rings. Read more

This group shows a single part: GM GENUINE 24293560.

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

3 Starter Motor parts are listed for the 2021 Cadillac CT4, from GM GENUINE, PURE ENERGY and FVP.

New: 1 part, from GM GENUINE. A representative part number is GM GENUINE 12744238.

Remanufactured: 1 part, from PURE ENERGY. A representative part number is PURE ENERGY 12964.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Listed part numbers: GM GENUINE 12744238 and PURE ENERGY 12964, 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

This group shows a single part: GM GENUINE 85532096.