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C0305 GMC - Front Propshaft Speed Sensor

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Front Propshaft Speed Sensor
  • Front Propshaft Speed Sensor harness is open or shorted
  • Front Propshaft Speed Sensor circuit poor electrical connection
  • Tech notes

    There is factory service bulletin for the C0305 code. The factory recommends reprogramming the Transfer Case Control Module (TCCOM) to fix the problem.

    Possible symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)
  • C0305 Gmc Description

    The Front Propshaft Speed Sensor is a permanent magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases. The transfer case shift control module converts the pulsating AC voltage to a propshaft RPM which is used for the following functions:

    - Calculations

    - To monitor the difference between the front and rear propshaft speed

    - In the AUTO, or the Adapt mode of operation, to determine the amount of slip and the percent of torque to apply to the front axle

    The module accesses this input when the vehicle is in AUTO mode, 4HI, and 4LO ranges. The propshaft RPM can be displayed with a scan tool.

    This DTC detects an open, short to ground, short to voltage or faulty sensor.

    OBDII Code C0305 Gmc - Front Propshaft Speed Sensor - Autoodes.com

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    Repair Importance Level: 3
     
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    Repair Difficulty Level: 3
     
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