C0305 OLDSMOBILE Possible Causes
- Faulty Front Propshaft Speed Sensor
- Front Propshaft Speed Sensor harness is open or shorted
- Front Propshaft Speed Sensor circuit poor electrical connection
First diagnose C0305 OLDSMOBILE code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
C0305 OLDSMOBILE Tech NotesThere is factory service bulletin for the C0305 code. The factory recommends reprogramming the Transfer Case Control Module (TCCOM) to fix the problem.
Cost of diagnosing the C0305 OLDSMOBILE code
Labor: 1.0The cost of diagnosing the C0305 OLDSMOBILE code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
C0305 OLDSMOBILE Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C0305 OLDSMOBILE MeaningThe 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:
- 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.
C0305 OLDSMOBILE More InformationNeed more information on how to fix the C0305 OLDSMOBILE code?
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