AutoCodes – Generic – C0300

C0300 Code - Rear Propshaft Speed Sensor

Quick Answer

The rear propshaft speed sensor is a Permanent Magnet (PM) generator. Common causes include Faulty Rear Propshaft Speed Sensor, Rear Propshaft Speed Sensor harness is open or shorted, Rear 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: C0300 indicates Rear Propshaft Speed Sensor.
Common causes: Common causes include Faulty Rear Propshaft Speed Sensor, Rear Propshaft Speed Sensor harness is open or shorted, Rear 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 30,273

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
Cost to Diagnose
FAQs
Comments
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Code C0300 Description

The rear 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 module converts the pulsating AC voltage to a propshaft RPM which is used for calculations. 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 C0300 - Rear Propshaft Speed Sensor - AutoCodes.com — C0300 Code - Rear Propshaft Speed Sensor

What does this mean?

What are the Possible Causes of the DTC C0300?

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

How to Fix the DTC C0300?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0300 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 C0300 code?

Need more information on how to fix the C0300 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0300 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0300 Buick — Rear Propshaft Speed Sensor
C0300 Cadillac — Rear Propshaft Speed Sensor
C0300 Chevrolet — Rear Propshaft Speed Sensor
C0300 GMC — Rear Propshaft Speed Sensor
C0300 Oldsmobile — Rear Propshaft Speed Sensor

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 C0300 Code

1. What are common symptoms of OBDII code C0300 (Rear Propshaft Speed Sensor)?

The common symptoms of OBDII code C0300 include issues with the vehicle's traction control system, ABS system, and drivability problems like poor acceleration or rough shifting.

2. What causes OBDII code C0300 (Rear Propshaft Speed Sensor) to trigger?

The code C0300 is usually triggered by a faulty rear propshaft speed sensor, damaged wiring or connectors related to the sensor, or issues with the propshaft itself.

3. How can I diagnose the OBDII code C0300 (Rear Propshaft Speed Sensor)?

To diagnose the code C0300, you can use a diagnostic scanner to read the code and further investigate the rear propshaft speed sensor, its wiring, and connectors for any visible damage or issues.

4. Can I drive my vehicle with OBDII code C0300 (Rear Propshaft Speed Sensor) present?

It is not recommended to drive your vehicle with the code C0300 present as it can lead to potential safety hazards due to impaired traction control and ABS system functionality.

5. How can I repair OBDII code C0300 (Rear Propshaft Speed Sensor)?

Repairing the code C0300 typically involves replacing the faulty rear propshaft speed sensor, repairing or replacing damaged wiring or connectors, and clearing the code with a diagnostic scanner.

6. Are there any DIY tips for fixing OBDII code C0300 (Rear Propshaft Speed Sensor)?

While some minor repairs like checking and cleaning sensor connectors can be done DIY, it is recommended to consult a professional mechanic for accurate diagnosis and repair of the code C0300.

7. How much does it cost to fix OBDII code C0300 (Rear Propshaft Speed Sensor)?

The cost of fixing the code C0300 can vary depending on the extent of the issue, the cost of parts needed for repair, and labor charges. It is advisable to get a few quotes from different repair shops for comparison.

8. What other codes may be related to OBDII code C0300 (Rear Propshaft Speed Sensor)?

Other related codes to OBDII code C0300 may include C0305 (Front Propshaft Speed Sensor), C0301 (Intermediate Propshaft Speed Sensor), or codes related to ABS or traction control system malfunctions.

9. Can a bad rear propshaft speed sensor cause other problems in the vehicle?

Yes, a bad rear propshaft speed sensor can cause issues with the vehicle's traction control system, ABS system, drivability problems, and potentially affect the overall performance and safety of the vehicle.

10. How often does OBDII code C0300 (Rear Propshaft Speed Sensor) occur in vehicles?

The occurrence of OBDII code C0300 can vary depending on the vehicle make and model, driving conditions, and maintenance history, but it is a relatively common code associated with rear propshaft speed sensor issues.