AutoCodes – Toyota – C1781 Toyota

C1781 Toyota Code - Steering Angle Sensor Circuit

Quick Answer

The Steering Angle Sensor is fitted to the turn signal switch assembly and detects the steering rotating direction and angle. Common causes include Faulty Steering Angle Sensor, Steering Angle Sensor harness is open or shorted, Steering Angle 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: C1781 Toyota indicates Steering Angle Sensor Circuit.
Common causes: Common causes include Faulty Steering Angle Sensor, Steering Angle Sensor harness is open or shorted, Steering Angle 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 3,545

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 Nov 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1781 Toyota Description

The Steering Angle Sensor is fitted to the turn signal switch assembly and detects the steering rotating direction and angle. The sensor consists of a slit disc that rotates with the steering wheel as a unit, and a pair of photo interrupters. Each photo interrupter consists of an LED (Light Emitting Diode) and a photo transistor, which face each other. It converts the change in the light irradiation between the 2 elements to the on/off signals. The slit disc rotates between the LED and the photo transistor of the pair of photo interrupters. As the steering wheel is operated, the slit disc rotates with the wheel as a unit to stop and allow light transmission between the 2 elements. The pair of photo interrupters have phases and the suspension ECU detects the steering direction and angle based on the changes of each output. When it is judged that the steering wheel's turning angle is large and the speed is greater than a set value, the ECU causes the damping force to increase.

OBDII Code C1781 Toyota - Steering Angle Sensor Circuit - AutoCodes.com — C1781 Toyota Code - Steering Angle Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC C1781 Toyota?

Faulty Steering Angle Sensor
Steering Angle Sensor harness is open or shorted
Steering Angle Sensor circuit poor electrical connection
Faulty Suspension ECU

How to Fix the DTC C1781 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 C1781 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 C1781 Toyota code?

Need more information on how to fix the C1781 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1781 Toyota code diagnosed by a professional: Find a repair shop in your area

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 C1781 Toyota Code

1. What are the common symptoms of OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

The common symptoms include the traction control, stability control, and ABS warning lights illuminating on the dashboard.

2. What can cause the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

The code can be triggered by a faulty steering angle sensor, damaged wiring in the steering angle sensor circuit, or a problem with the sensor calibration.

3. How can I diagnose the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

Diagnosis typically involves using a scan tool to read the code, checking the wiring and connectors for damage, and performing a calibration of the steering angle sensor.

4. Can I drive my vehicle with the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

It is not recommended to drive the vehicle with this code present, as it can affect the operation of the traction control and stability control systems.

5. How do I repair the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

Repairing the issue may involve replacing the steering angle sensor, repairing any damaged wiring, or recalibrating the sensor according to manufacturer specifications.

6. Is it safe to ignore the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

Ignoring the code can lead to potential safety risks as it affects the proper functioning of important vehicle stability systems.

7. Can a DIY enthusiast fix the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

While some basic diagnosis and repairs can be done by a DIY enthusiast, it is recommended to have a professional technician address this code to ensure proper repair and calibration.

8. How much does it cost to repair the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

The cost of repair can vary depending on the exact cause of the issue, but it typically ranges from $200 to $500, including parts and labor.

9. How long does it take to repair the OBDII code C1781 Toyota (Steering Angle Sensor Circuit)?

The repair time can vary based on the extent of the issue and the availability of parts, but it usually takes 1-2 hours to complete the repair.

10. Can a faulty steering angle sensor affect other vehicle systems?

Yes, a faulty steering angle sensor can affect the operation of the traction control, stability control, and ABS systems, leading to potential safety hazards.