OBD code C0300 indicates an issue with the Rear Propshaft Speed Sensor in the AntiLock Brake System (ABS).
Symptoms include the ABS warning light and engine light being illuminated.
This is commonly caused by a faulty sensor, open/shorted sensor harness, or poor electrical connection.
It is a moderate issue that should be addressed promptly.
To fix, inspect the sensor, wiring harness, and connectors for any damage or poor connections.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the c0300 OBD Code
The vehicle may experience issues with the ABS system due to fault code C0300.
- When OBD code C0300 occurs, symptoms may include: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Possible loss of traction control functionality.
- Difficulty stopping in slippery conditions.
- Strange noises coming from the ABS system.
Causes of the c0300 OBD Code
Do you know you can clear most fault codes—but some could mean serious danger? Don’t take chances with your safety or your family’s safety. This budget-friendly car scanner makes it easy to clear fault codes in seconds while showing you exactly what’s wrong. Plug it in, connect to your Android or iOS phone, and instantly check live data. You’ll know if it’s a minor issue you can clear or something serious that needs attention—so you can drive safely and stress-free. (Today’s Deal)
Possible issues related to fault code C0300 include wheel speed sensor malfunction or wiring problems.
- C0300 can be caused by a Faulty Rear Propshaft Speed Sensor.
- A Rear Propshaft Speed Sensor harness that is open or shorted.
- A Rear Propshaft Speed Sensor circuit with poor electrical connection.
Fixing Error Code c0300 Step By Step
Resolve fault code C0300 by inspecting the vehicle’s wheel speed sensor circuit for potential issues.
- To fix OBDII code C0300, first, review the possible causes related to this code.
- Visually inspect the wiring harness and connectors associated with the ABS system.
- Check for any damaged components and ensure the connector pins are not broken, bent, pushed out, or corroded.
- If no issues are found during the visual inspection, proceed to perform a diagnostic scan tool test to pinpoint the exact cause of the C0300 code.
- Based on the scan results, replace any faulty ABS sensors, repair damaged wiring, or reprogram the ABS module as necessary to resolve the issue.
Cost Of Fixing c0300 Fault Code
Diagnosing and repairing fault code C0300 typically involves inspecting and servicing the vehicle’s ABS system.
The cost to diagnose and fix OBD code C0300 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
The total cost depends on labor rates, shop fees, and the complexity of the issue.
That fault code is a turning point. If repair costs are climbing and your current loan feels like it’s holding you back, this is the time to plan ahead. The free Car Loan Payment Tracker helps you see how quickly you can pay off what’s left—and start preparing, with confidence, for your dream car.
Details of the c0300 OBD Code
Code C0300 indicates an issue with the vehicle’s rear speed sensor circuit malfunction.
OBD code C0300 means that there is a random misfire detected.
This code is triggered by the Engine Control Module (ECM) when it detects misfires that do not correspond to a specific cylinder.
The ECM monitors engine speed fluctuations to identify these random misfires across multiple cylinders.
Mechanic’s Tech Notes
Code C0300 indicates an issue with the vehicle’s rear speed sensor circuit.
To diagnose and fix OBDII code C0300, start by checking the power and ground to the Transmission Control Module (TCM) using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) network with a scan tool.
If communication issues are found, reprogramming or reflashing the TCM may be necessary.
Additionally, inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection will help identify and address the root cause of the C0300 code.
FAQ
Common symptoms for OBD code C0300 include ABS warning light on, engine light on. Causes may be faulty rear propshaft speed sensor or related wiring issues. Fix: Inspect and repair as needed.
Possible causes of OBD code C0300 include a faulty rear propshaft speed sensor, open/shorted sensor harness, or poor electrical connection. Inspect and repair as needed.
Diagnose OBD code C0300 by checking rear propshaft speed sensor and its wiring for faults. Inspect connectors for damage or corrosion. Fix as needed.
Wrap Up
If your ABS warning light is illuminated and you see OBDII code c0300, it may indicate a problem with the right front wheel speed sensor circuit.
This could be caused by a faulty wheel speed sensor, damaged wiring harness, or poor connection at the sensor or ABS module.
To address OBDII code c0300, start by inspecting the wiring leading to the right front wheel speed sensor for any visible damage or corrosion.
Test the sensor for proper operation and check the connector for a secure fit.
Replace the sensor if necessary and ensure all connections are clean and tight.
