P18CA GMC - Gear Position Sensor Not Learned

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

Possible causes

  • Faulty Gear Position Sensor
  • Gear Position Sensor harness is open or shorted
  • Gear Position Sensor circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P18ca Gmc Description

The 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.
OBDII Code P18ca Gmc - Gear Position Sensor Not Learned - AutoCodes.com

Need more help?

Get the P18ca Gmc code diagnosed by a professional: Find a repair shop in your area

Related Information

P18CA GMC Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P18ca Gmc code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧