2026 Cadillac CT4 Ignition Parts

This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor. Read more

3 Camshaft Position Sensor parts are listed for the 2026 Cadillac CT4, from GM GENUINE and HOLSTEIN.

In the Economy grade, HOLSTEIN supplies 1 part: the catalog's value-priced group. A representative part number is HOLSTEIN 2CAM0134.

The Standard Replacement section lists 1 option from GM GENUINE — built to original-equipment specification. GM GENUINE 12684186 is listed in this group.

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

Listed part numbers: HOLSTEIN 2CAM0134, GM GENUINE 12684186 and GM GENUINE 12733487.

This table covers the interrupter wheels the camshaft sensor reads. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 55510087.

This table covers the seals at the Camshaft Position Sensor. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: GM GENUINE 12626252.

This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor. Read more

3 Crankshaft Position Sensor parts are listed for the 2026 Cadillac CT4, from GM GENUINE and HOLSTEIN.

Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CRK0307.

The Standard Replacement section: 1 option from GM GENUINE. GM GENUINE 2134573 is listed in this group.

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

Part numbers include HOLSTEIN 2CRK0307, GM GENUINE 2134573 and GM GENUINE 12706708.

This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off. Read more

7 Ignition Coil parts are listed for the 2026 Cadillac CT4, from GM GENUINE, STANDARD MOTOR PRODUCTS, HOLSTEIN and 1 other brand.

Economy: 2 parts, from HOLSTEIN and STANDARD MOTOR PRODUCTS. A representative part number is HOLSTEIN 2IGC0137.

The Standard Replacement section: 2 options from DENSO and GM GENUINE. DENSO 6737303 is listed in this group.

3 ungrouped parts are not assigned to a grade, with the same engine-level match.

Part numbers include HOLSTEIN 2IGC0137, STANDARD MOTOR PRODUCTS UF569T and DENSO 6737303, among others listed above.

This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine. Read more

3 Spark Plug parts for the 2026 Cadillac CT4 come from ACDELCO.

This group includes ACDELCO 41103IP, ACDELCO 41106IP and ACDELCO 41147.

This table covers the silicone and rubber boots that insulate the coil-to-plug spark path. Typical signs include a misfire in the rain, carbon tracking on the boot, or a snap when you pop the coil off. Replace boots as a set on a high-mileage engine; one cracked boot will take the coil with it. Read more

GM GENUINE supplies both parts for the 2026 Cadillac CT4.

This group includes GM GENUINE 55511557 and GM GENUINE 12711622.

This table covers the seals at the Spark Plug Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

One part is listed for the 2026 Cadillac CT4 — GM GENUINE 12607600.