AutoCodes – Oldsmobile – C0305 Oldsmobile

C0305 Oldsmobile Code - Front Propshaft Speed Sensor

Quick Answer

The Front Propshaft Speed Sensor is a permanent magnet (PM) generator. Common causes include Faulty Front Propshaft Speed Sensor, Front Propshaft Speed Sensor harness is open or shorted, Front Propshaft Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C0305 Oldsmobile indicates Front Propshaft Speed Sensor.
Common causes: Common causes include Faulty Front Propshaft Speed Sensor, Front Propshaft Speed Sensor harness is open or shorted, Front Propshaft Speed Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,442

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 18, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0305 Oldsmobile 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 Oldsmobile - Front Propshaft Speed Sensor - AutoCodes.com — C0305 Oldsmobile Code - Front Propshaft Speed Sensor

What does this mean?

What are the Possible Causes of the DTC C0305 Oldsmobile?

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

How to Fix the DTC C0305 Oldsmobile?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0305 Oldsmobile code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C0305 Oldsmobile code?

Need more information on how to fix the C0305 Oldsmobile code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0305 Oldsmobile code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C0305 Oldsmobile Code

1. What are the common symptoms of OBDII code C0305 in an Oldsmobile related to the Front Propshaft Speed Sensor?

- Common symptoms include erratic speedometer readings, ABS system malfunctions, and traction control issues.

2. What are the possible causes of OBDII code C0305 in an Oldsmobile?

- The code C0305 in an Oldsmobile typically indicates a fault with the Front Propshaft Speed Sensor, which may be caused by a faulty sensor, damaged wiring, or a malfunctioning control module.

3. How can I diagnose the issue if my Oldsmobile is showing OBDII code C0305 related to the Front Propshaft Speed Sensor?

- Diagnose the issue by checking the sensor for physical damage, inspecting the wiring for any breaks or shorts, and using a scan tool to monitor sensor readings.

4. Can I still drive my Oldsmobile with OBDII code C0305 present?

- It is not recommended to drive the vehicle with OBDII code C0305 present, as it can affect the proper functioning of the speedometer, ABS system, and traction control, potentially compromising safety.

5. How do I repair OBDII code C0305 in my Oldsmobile?

- To repair OBDII code C0305, you may need to replace the Front Propshaft Speed Sensor, repair any damaged wiring, or reprogram the control module if necessary.

6. Are there any tips for preventing OBDII code C0305 from recurring in my Oldsmobile?

- Regularly inspecting the Front Propshaft Speed Sensor and its wiring for damage, ensuring proper installation, and addressing any related issues promptly can help prevent the recurrence of OBDII code C0305.

7. Can a DIY enthusiast fix OBDII code C0305 in an Oldsmobile?

- Depending on the extent of the issue, DIY enthusiasts with automotive repair experience may be able to replace the Front Propshaft Speed Sensor or repair wiring themselves. However, complex diagnostics and reprogramming may require professional assistance.

8. How long does it typically take to repair OBDII code C0305 in an Oldsmobile?

- The repair time for OBDII code C0305 can vary depending on the exact cause of the issue and the extent of repairs needed. It may take anywhere from an hour for a simple sensor replacement to several hours for more complex diagnostics and repairs.

9. Will resetting the OBDII system clear the C0305 code in an Oldsmobile?

- Resetting the OBDII system may temporarily clear the C0305 code, but it is crucial to diagnose and address the underlying issue causing the code to prevent it from recurring.

10. Is it necessary to visit a dealership for repairs related to OBDII code C0305 in an Oldsmobile?

- While visiting a dealership can ensure proper diagnosis and repair of OBDII code C0305, independent automotive repair shops with experience in diagnosing and repairing electrical issues may also be able to effectively address the problem.