AutoCodes – Toyota – C1239 Toyota

C1239 Toyota Code - Foreign Object Attached on Tip of Left Rear Sensor

Quick Answer

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. Common causes include Faulty Left Rear Speed Sensor, Left Rear Speed Sensor rotor, Sensor installation. 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: C1239 Toyota indicates Foreign Object Attached on Tip of Left Rear Sensor.
Common causes: Common causes include Faulty Left Rear Speed Sensor, Left Rear Speed Sensor rotor, Sensor installation.
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 37,071

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 Mar 21, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1239 Toyota Description

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations each.
When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

OBDII Code C1239 Toyota - Foreign Object Attached on Tip of Left Rear Sensor - AutoCodes.com — C1239 Toyota Code - Foreign Object Attached on Tip of Left Rear Sensor

What does this mean?

What are the Possible Causes of the DTC C1239 Toyota?

Faulty Left Rear Speed Sensor
Left Rear Speed Sensor rotor
Sensor installation
Faulty Skid Control ECU (Brake Actuator Assembly)

How to Fix the DTC C1239 Toyota?

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 C1239 Toyota 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 C1239 Toyota code?

Need more information on how to fix the C1239 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C1239 Toyota Code

1. What are the common symptoms of OBDII code C1239 in a Toyota related to a foreign object attached to the left rear sensor?

- The common symptoms include erratic braking behavior, ABS system malfunctions, and illuminated warning lights on the dashboard.

2. What could cause the OBDII code C1239 in a Toyota indicating a foreign object attached to the left rear sensor?

- The code is typically triggered when a foreign object, such as debris or mud, is obstructing the tip of the left rear sensor, affecting its functionality.

3. How can I diagnose if a foreign object is attached to the left rear sensor triggering OBDII code C1239 in my Toyota?

- Visual inspection of the sensor area and cleaning any visible debris can help identify if a foreign object is causing the issue.

4. Can a foreign object on the left rear sensor triggering code C1239 be removed without professional help?

- In some cases, a simple cleaning or removal of the foreign object by the vehicle owner can resolve the issue. However, if the problem persists, professional assistance may be required.

5. Is it safe to drive my Toyota with OBDII code C1239 related to a foreign object on the left rear sensor?

- It is not recommended to drive the vehicle with this issue unresolved, as it may affect the ABS system's performance and compromise the vehicle's safety.

6. How urgent is it to address the OBDII code C1239 in a Toyota caused by a foreign object on the left rear sensor?

- It is important to address the issue promptly to ensure the proper functioning of the ABS system and maintain safe driving conditions.

7. Are there any preventive measures to avoid foreign objects attaching to the left rear sensor in a Toyota?

- Regularly inspecting and cleaning the sensor area, especially after driving in muddy or debris-prone areas, can help prevent foreign objects from causing issues.

8. Can weather conditions affect the likelihood of foreign objects attaching to the left rear sensor in a Toyota?

- Yes, driving in rainy or muddy conditions can increase the chances of debris sticking to the sensor, triggering the OBDII code C1239.

9. Will cleaning the left rear sensor resolve the OBDII code C1239 issue in a Toyota if a foreign object is attached?

- Cleaning the sensor and removing any foreign object can often resolve the problem, but if the code persists, further inspection may be necessary.

10. How much does it typically cost to repair the issue related to OBDII code C1239 caused by a foreign object on the left rear sensor in a Toyota?

- The cost of repair can vary depending on the extent of the issue and whether professional assistance is required. Cleaning the sensor yourself may incur minimal costs, while professional repairs could range from moderate to higher expenses.