What does the Crankshaft Position (CKP) sensor provide to the PCM?

The Crankshaft Position (CKP) sensor provides the PCM with a crankshaft position signal, which the PCM uses to determine the spark sequence for each cylinder, control ignition timing, and calculate engine speed. The signal is also used by the Onboard Diagnostic system for misfire detection. The sensor is triggered by slots cut into a reluctor ring on the crankshaft and is positioned approximately 0.050 inch from the reluctor ring. As the notches pass the sensor, the magnetic field is altered, producing a pulsating voltage. The ignition system will not operate if the PCM does not receive a crankshaft position sensor input. When replacing the sensor, the PCM must be reprogrammed using special equipment and a crankshaft sensor variation relearn procedure must be performed using a special TECH 2 scan tool. This should be done by a dealer service department or other qualified automotive repair facility. To replace the sensor, disconnect the cable from the negative battery terminal, raise the vehicle and support it securely on jackstands, disconnect the electrical connector from the sensor, remove the sensor mounting bolt and the sensor itself. Installation is the reverse of removal.

Genuine Chevrolet Trailblazer Crankshaft Position Sensor

Engine Crankshaft Position Sensor

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7 Crankshaft Position Sensors found

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Chevrolet Trailblazer Sensor Assembly, Cr/Shf Posn
Part Number: 12703627
$48.07 MSRP: $99.82
You Save: $51.75 (52%)
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Product Specifications
- Other Name: Crankshaft Position Sensor, Crankshaft Sensor
- Replaces: 12585546
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2009 Chevrolet Trailblazer | 4 DOOR | 8 Cyl 5.3L, 8 Cyl 6.0L
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Chevrolet Trailblazer Sensor,Crankshaft Position
Part Number: 12567712
$40.51 MSRP: $84.12
You Save: $43.61 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Distributor (also Knock Sensor); Crankshaft Position Sensor, Crankshaft Sensor
- Replaces: 1103703, 24576398, 10456295
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2007 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
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Chevrolet Trailblazer Sensor Assembly, Crankshaft Position
Part Number: 12597254
$25.46 MSRP: $48.04
You Save: $22.58 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Distributor (also Knock Sensor); Crankshaft Position Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2009 Chevrolet Trailblazer | 4 DOOR | 6 Cyl 4.2L
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Chevrolet Trailblazer Sensor,Crankshaft Position
Part Number: 12560228
$63.78 MSRP: $114.40
You Save: $50.62 (45%)
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Product Specifications
- Other Name: SENSOR, Distributor (also Knock Sensor); Crankshaft Position Sensor, Crankshaft Sensor
- Replaces: 12555566
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2006 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L, 8 Cyl 6.0L
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Chevrolet Trailblazer Sensor Assembly, Knock
Part Number: 12663209
$3.91 MSRP: $7.37
You Save: $3.46 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Knock Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Trailblazer | 4 DOOR EXT | 3 Cyl 1.3L
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Chevrolet Trailblazer Sensor Assembly, Cr/Shf Posn
Part Number: 12706708
$6.78 MSRP: $12.16
You Save: $5.38 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Crankshaft Position Sensor, Crankshaft Sensor
- Replaces: 55507118
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Trailblazer | 4 DOOR EXT | 3 Cyl 1.2L, 3 Cyl 1.3L
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Chevrolet Trailblazer Sensor Assembly, Cm/Shf Posn
Part Number: 12698173
$11.50 MSRP: $21.70
You Save: $10.20 (47%)
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Product Specifications
- Replaced by: 12733487
- Replaces: 55508453
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Trailblazer | 4 DOOR EXT | 3 Cyl 1.2L

Chevrolet Trailblazer Crankshaft Position Sensor Parts Questions & Experts Answers

Sensor Assembly, Crankshaft Position
12597254
Q: What does the Crankshaft Position (CKP) sensor provide to the PCM?
A: The Crankshaft Position (CKP) sensor provides the PCM with a crankshaft position signal, which the PCM uses to determine the spark sequence for each cylinder, control ignition timing, and calculate engine speed. The signal is also used by the Onboard Diagnostic system for misfire detection. The sensor is triggered by slots cut into a reluctor ring on the crankshaft and is positioned approximately 0.050 inch from the reluctor ring. As the notches pass the sensor, the magnetic field is altered, producing a pulsating voltage. The ignition system will not operate if the PCM does not receive a crankshaft position sensor input. When replacing the sensor, the PCM must be reprogrammed using special equipment and a crankshaft sensor variation relearn procedure must be performed using a special TECH 2 scan tool. This should be done by a dealer service department or other qualified automotive repair facility. To replace the sensor, disconnect the cable from the negative battery terminal, raise the vehicle and support it securely on jackstands, disconnect the electrical connector from the sensor, remove the sensor mounting bolt and the sensor itself. Installation is the reverse of removal.