2026 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

This group shows a single part: GM GENUINE 84938163.

This table covers the Alternator / Generator bolts. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 11611102.

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

9 Battery parts are listed for the 2026 Cadillac CT4, from ACDELCO, DEKA, FVP and 1 other brand. DEKA 9A48 carries the "Popular" badge. 1 part fits every engine; the other 8 are engine-specific.

Listed part numbers: DEKA 9A48, DEKA 9A94R and ACDELCO 94RAGMHR, plus the other 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

4 Battery Cable parts for the 2026 Cadillac CT4 come from GM GENUINE. 1 part fits every engine; the other 3 are engine-specific.

Part numbers include GM GENUINE 42934095, GM GENUINE 86801288 and GM GENUINE 85011509, among others listed above.

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

This group shows a single part: GM GENUINE 11609585.

This table covers the Battery Vent tubes. Read more

This group shows a single part: GM GENUINE 85665279.

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

This group shows a single part: 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

This group shows a single part: GM GENUINE 84930206.

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

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 84215440.

This table covers the Cruise Control Distance 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 2026 Cadillac CT4 — GM GENUINE 86558605.

This table covers the Cruise control modules. Read more

2 Cruise Control Module parts for the 2026 Cadillac CT4 come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.7L L4 Turbocharged and 3.6L V6 Turbocharged).

This group includes GM GENUINE 85031657 and GM GENUINE 85776845.

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

2 Engine Control Module (ECM Computer) parts for the 2026 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12725415 and GM GENUINE 12740833.

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

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 11519377.

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 84799323.

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

12 Fuse parts are listed for the 2026 Cadillac CT4, from GM GENUINE and ACDELCO. GM GENUINE 15305191 carries the "Popular" badge. 9 parts fit every engine; the other 3 are engine-specific.

The 100 Amp section lists 1 option from GM GENUINE — grouped under the catalog's "100 Amp" designation — the notes column spells out what sets them apart. GM GENUINE 84070942 is listed in this group.

In the 125 Amp grade, GM GENUINE supplies 1 part: grouped under the catalog's "125 Amp" designation — the notes column spells out what sets them apart. A representative part number is GM GENUINE 12177251.

In the 150 Amp grade, GM GENUINE supplies 1 part: grouped under the catalog's "150 Amp" designation — the notes column spells out what sets them apart. A representative part number is GM GENUINE 84070922.

The 175 Amp section lists 1 option from GM GENUINE — grouped under the catalog's "175 Amp" designation — the notes column spells out what sets them apart. GM GENUINE 15305191 is listed in this group.

The 250 Amp section lists 1 option from GM GENUINE — grouped under the catalog's "250 Amp" designation — the notes column spells out what sets them apart. GM GENUINE 84116255 is listed in this group.

The 30 Amp section lists 3 options from ACDELCO and GM GENUINE — grouped under the catalog's "30 Amp" designation — the notes column spells out what sets them apart. GM GENUINE 22917202 is listed in this group.

In the 350 Amp grade, GM GENUINE supplies 1 part: grouped under the catalog's "350 Amp" designation — the notes column spells out what sets them apart. A representative part number is GM GENUINE 84116257.

The 50 Amp section lists 1 option from ACDELCO — grouped under the catalog's "50 Amp" designation — the notes column spells out what sets them apart. ACDELCO MAX50 is listed in this group.

The 70 Amp section lists 2 options from GM GENUINE — grouped under the catalog's "70 Amp" designation — the notes column spells out what sets them apart. GM GENUINE 84070937 is listed in this group.

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

GM GENUINE supplies both parts for the 2026 Cadillac CT4. All of them fit every engine offered in the 2026 CT4.

This group includes GM GENUINE 84849439 and GM GENUINE 84849440.

This table covers the Jumper cables. 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 Jumper Cable parts for the 2026 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 86801277, GM GENUINE 86801278 and GM GENUINE 86807282.

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

9 Keyless Entry Remote parts for the 2026 Cadillac CT4 come from GM GENUINE. The "Popular" part is GM GENUINE 85043355.

Listed part numbers: GM GENUINE 85043355, 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

This group shows a single part: 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

GM GENUINE supplies both parts for the 2026 Cadillac CT4. 1 part fits every engine; the other 1 is engine-specific.

This group includes 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

This group shows a single part: GM GENUINE 84586217.

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

2 Parking Aid Sensor Bracket parts for the 2026 Cadillac CT4 come from GM GENUINE.

This group includes GM GENUINE 84637866 and GM GENUINE 84637867.

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 2026 Cadillac CT4 — GM GENUINE 13563696.

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

3 Rain Sensor parts for the 2026 Cadillac CT4 come from GM GENUINE. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include GM GENUINE 85880852, GM GENUINE 85880857 and GM GENUINE 85880858.

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

2 Serial Data Gateway Module parts for the 2026 Cadillac CT4 come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.7L L4 Turbocharged and 3.6L V6 Turbocharged).

Part numbers include GM GENUINE 13545362 and GM GENUINE 13553311.

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

3 Side Object Sensor Module parts for the 2026 Cadillac CT4 come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.7L L4 Turbocharged and 3.6L V6 Turbocharged).

This group includes GM GENUINE 85826110, GM GENUINE 85826109 and GM GENUINE 86558606.

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

GM GENUINE supplies the 7 Speed Sensor parts for the 2026 Cadillac CT4. GM GENUINE 24043446 carries the "Popular" badge.

This group includes GM GENUINE 24043446, GM GENUINE 24296964 and GM GENUINE 24060865 and the remaining parts above.

This table covers the Speed Sensor Reluctor rings. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 24293560.

This table covers the Starter bolts. Read more

2 Starter Bolt parts for the 2026 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 11588740 and GM GENUINE 11588749.

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 for the 2026 Cadillac CT4 come from 3 brands — GM GENUINE, REMY and TERREPOWER.

The New section lists 1 option from GM GENUINE — brand-new units rather than rebuilt ones. GM GENUINE 12652028 is listed in this group.

The Remanufactured section lists 2 options from REMY and TERREPOWER — factory-rebuilt units with new wear components. REMY 26012 is listed in this group.

1 further part sits outside the graded sections, with the same engine-level match.

Part numbers include GM GENUINE 12652028, REMY 26012 and TERREPOWER 19289, among others listed above.

This table covers the Video control modules. Read more

This group shows a single part: GM GENUINE 42937248.

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 2026 Cadillac CT4 — GM GENUINE 85532096.