C1278 2017 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 2017 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.
Code C1278 2017 Toyota RAV4 Description
What are the Possible Causes of the DTC C1278 2017 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 2017 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1278 2017 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 2017 Toyota RAV4 code?
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Frequently Asked Questions about C1278 2017 Toyota RAV4 Code
1. What are the common symptoms of OBDII code C1278 in a 2017 Toyota RAV4?
When the rear speed sensor left output signal is abnormal, you may experience issues like erratic speedometer readings, ABS system malfunctions, and traction control problems.
2. What could cause the OBDII code C1278 in a 2017 Toyota RAV4?
Possible causes of this code include a faulty rear speed sensor left, damaged wiring or connectors, disrupted signal transmission, or sensor misalignment.
3. How can I diagnose the OBDII code C1278 in my 2017 Toyota RAV4?
You can start by visually inspecting the rear speed sensor left and its connections for any visible damage. Using a diagnostic tool to read the code and perform a sensor test can help pinpoint the issue.
4. Is it safe to drive my 2017 Toyota RAV4 with the C1278 code illuminated?
It is not recommended to drive your vehicle with this code active, as it can affect important safety systems like ABS and traction control. Prompt diagnosis and repair are advisable.
5. Can I repair the OBDII code C1278 in my 2017 Toyota RAV4 myself?
If you have the necessary tools and expertise, you may attempt to replace the rear speed sensor left or repair any damaged wiring. However, professional assistance is recommended for accurate diagnosis and proper repair.
6. How much does it cost to fix the OBDII code C1278 in a 2017 Toyota RAV4?
The cost of repairing this code can vary depending on the exact cause of the issue. It may involve sensor replacement, wiring repairs, or other troubleshooting, so it's best to consult a mechanic for a detailed estimate.
7. Can a bad wheel bearing cause the OBDII code C1278 in a 2017 Toyota RAV4?
While a bad wheel bearing itself may not directly trigger this code, it can potentially affect the speed sensor's performance and lead to abnormal output signals. Checking the wheel bearing condition is advisable during diagnosis.
8. Will resetting the OBDII code C1278 in my 2017 Toyota RAV4 make it go away permanently?
Simply resetting the code without addressing the underlying issue will not fix the problem permanently. It's crucial to diagnose the root cause and perform necessary repairs to prevent the code from reoccurring.
9. How long does it take to repair the OBDII code C1278 in a 2017 Toyota RAV4?
The repair time can vary based on the specific cause of the issue and the complexity of the repair needed. Some cases may be resolved quickly, while others may require more extensive troubleshooting and labor.
10. Can extreme weather conditions affect the rear speed sensor left and trigger the OBDII code C1278 in a 2017 Toyota RAV4?
Yes, extreme weather conditions like heavy rain, snow, or extreme temperatures can potentially damage the sensor or its connections, leading to abnormal output signals and triggering the C1278 code.
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