P18CA BUICK - Gear Position Sensor Not Learned
- Faulty Gear Position Sensor
- Gear Position Sensor harness is open or shorted
- Gear Position Sensor circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P18ca Buick DescriptionThe gear position sensor is a switching transistor mounted to the top of the transmission extension housing. The four wire sensor interfaces directly with the Engine Control Module (ECM). The ECM supplies 5 V to the gear position sensor on a 5 V reference circuit and also provides a ground path on a low reference circuit. The sensor provides a Pulse Width Modulated (PWM) duty cycle to the ECM on two signal circuits that is proportional to the linear and radial position of the corresponding magnet assembly mounted to the shift shaft. The vehicle uses the gear position sensor information primarily for Active Rev Matching and Active Fuel Management.
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