AutoCodes – Toyota – C1278 2013 Toyota RAV4

C1278 2013 Toyota RAV4 Code - Abnormal Change in Output Signal of Rear Speed Sensor Left

Quick Answer

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU (Brake Actuator Assembly). Common causes include Faulty Rear Speed Sensor Left, Rear Speed Sensor Left Rotor (Rear Axle Hub and Bearing Assembly Left), Rear Speed Sensor Left harness is open or shorted. 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: C1278 2013 Toyota RAV4 indicates Abnormal Change in Output Signal of Rear Speed Sensor Left.
Common causes: Common causes include Faulty Rear Speed Sensor Left, Rear Speed Sensor Left Rotor (Rear Axle Hub and Bearing Assembly Left), Rear Speed Sensor Left harness is open or shorted.
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 258

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1278 2013 Toyota RAV4 Description

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU (Brake Actuator Assembly). These signals are used for Anti-Lock Brake System (ABS) control. Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn. Each speed sensor detects that magnetic change and sends a pulse signal to the Skid Control ECU (Brake Actuator Assembly).

OBDII Code C1278 2013 Toyota RAV4 - Abnormal Change in Output Signal of Rear Speed Sensor Left - AutoCodes.com — C1278 2013 Toyota RAV4 Code - Abnormal Change in Output Signal of Rear Speed Sensor Left

What does this mean?

What are the Possible Causes of the DTC C1278 2013 Toyota RAV4?

Faulty Rear Speed Sensor Left
Rear Speed Sensor Left Rotor (Rear Axle Hub and Bearing Assembly Left)
Rear Speed Sensor Left harness is open or shorted
Rear Speed Sensor Left circuit poor electrical connection

How to Fix the DTC C1278 2013 Toyota RAV4?

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

Because the Rear Axle Hub and Bearing Assembly cannot be disassembled, if the Rear Speed Sensor needs replacement, replace the Rear Axle Hub and Bearing Assembly.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1278 2013 Toyota RAV4 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 C1278 2013 Toyota RAV4 code?

Need more information on how to fix the C1278 2013 Toyota RAV4 code? Get Access to Factory Service Manuals

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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 C1278 2013 Toyota RAV4 Code

1. What are the common symptoms of OBDII code C1278 in a 2013 Toyota RAV4?

The common symptoms include the ABS warning light coming on, traction control system malfunctioning, and potential issues with the vehicle's stability control.

2. What does the OBDII code C1278 indicate in a 2013 Toyota RAV4?

OBDII code C1278 indicates an abnormal change in the output signal of the rear speed sensor on the left side of the vehicle.

3. What are the possible causes of OBDII code C1278 in a 2013 Toyota RAV4?

Possible causes include a faulty rear speed sensor, damaged wiring or connectors in the sensor circuit, or issues with the ABS module.

4. How can I diagnose the OBDII code C1278 in my 2013 Toyota RAV4?

Diagnosis typically involves checking the rear speed sensor for proper operation, inspecting the wiring and connectors for damage, and using a scan tool to retrieve and interpret the trouble codes.

5. How can I repair OBDII code C1278 in my 2013 Toyota RAV4?

Repair options may include replacing the rear speed sensor, repairing any damaged wiring or connectors, or addressing any issues with the ABS module as needed.

6. Can I drive my 2013 Toyota RAV4 with OBDII code C1278?

It is not advisable to drive the vehicle with OBDII code C1278 present, as it may affect the proper functioning of the ABS and traction control systems, potentially compromising safety.

7. Is it necessary to reset the OBDII code C1278 after repairing the issue in a 2013 Toyota RAV4?

Yes, it is recommended to reset the trouble codes after repairing the issue to clear the ABS warning light and ensure proper operation of the vehicle's systems.

8. Can OBDII code C1278 in a 2013 Toyota RAV4 be a recurring problem?

If the root cause of the issue is not properly addressed during repairs, OBDII code C1278 may reoccur. Thorough diagnosis and correct repairs are essential to prevent recurrence.

9. Are there any preventative measures to avoid OBDII code C1278 in a 2013 Toyota RAV4?

Regular maintenance, including checking the ABS system components and sensors, can help prevent issues that may lead to OBDII code C1278 in a 2013 Toyota RAV4.

10. Can a DIY enthusiast resolve OBDII code C1278 in a 2013 Toyota RAV4?

While some basic diagnosis and repairs may be possible for experienced DIY enthusiasts, addressing OBDII code C1278 often requires specialized tools and expertise, making professional assistance advisable.