AutoCodes – Toyota – C1940 Toyota

C1940 Toyota Code - Front Yaw Rate Sensor

Quick Answer

The Active Stabilizer Suspension System uses CAN communication to gather information necessary for control functions. Common causes include Faulty Front Active Stabilizer Control ECU, Front Active Stabilizer Control ECU harness is open or shorted, Front Active Stabilizer Control ECU 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: C1940 Toyota indicates Front Yaw Rate Sensor.
Common causes: Common causes include Faulty Front Active Stabilizer Control ECU, Front Active Stabilizer Control ECU harness is open or shorted, Front Active Stabilizer Control ECU 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 785

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 Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C1940 Toyota Description

The Active Stabilizer Suspension System uses CAN communication to gather information necessary for control functions. When a malfunction occurs in another system, the Diagnostic Trouble Code (DTC) is stored.

OBDII Code C1940 Toyota - Front Yaw Rate Sensor - AutoCodes.com — C1940 Toyota Code - Front Yaw Rate Sensor

What does this mean?

What are the Possible Causes of the DTC C1940 Toyota?

Faulty Front Active Stabilizer Control ECU
Front Active Stabilizer Control ECU harness is open or shorted
Front Active Stabilizer Control ECU circuit poor electrical connection

How to Fix the DTC C1940 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 C1940 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 C1940 Toyota code?

Need more information on how to fix the C1940 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1940 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 C1940 Toyota Code

1. What does the OBDII code C1940 in a Toyota indicate?

- The code C1940 in a Toyota indicates a malfunction in the Front Yaw Rate Sensor, which is part of the vehicle's stability control system.

2. What symptoms might I notice if my Toyota has the C1940 code?

- Symptoms of the C1940 code can include the stability control or traction control light being illuminated on the dashboard, decreased handling performance, and possibly the vehicle feeling unstable in sharp turns.

3. What could cause the C1940 code to appear in my Toyota?

- Causes of the C1940 code may include a faulty yaw rate sensor, damaged wiring or connectors related to the yaw rate sensor, or issues with the sensorâ€™s alignment or installation.

4. How is the C1940 code diagnosed in a Toyota?

- Diagnosing the C1940 code typically involves using a scan tool to read the fault code and live data, inspecting the physical condition of the yaw rate sensor and its connections, and possibly performing specific tests to evaluate the sensor's functionality.

5. Can I drive my Toyota with the C1940 code active?

- While you can technically still drive your Toyota with the C1940 code active, it is not recommended because it affects the stability control system, which can compromise vehicle safety, especially in adverse driving conditions.

6. What are the common repair steps for fixing the OBDII code C1940 in a Toyota?

- Repairing the C1940 code typically involves replacing or recalibrating the front yaw rate sensor, repairing any damaged wiring or connectors, and clearing the code with an OBDII scan tool to verify the repair.

7. How much does it typically cost to resolve a C1940 code in a Toyota?

- The cost to resolve a C1940 code can vary widely, depending on whether the yaw rate sensor needs to be replaced or simply recalibrated. Costs can range from $200 to $600 including parts and labor.

8. Is there a way to prevent the C1940 code from occurring in my Toyota?

- Preventing the C1940 code can involve regular vehicle maintenance, ensuring that the yaw rate sensor and its connections are kept clean and secure, and avoiding driving habits that could lead to excessive wear or damage to the vehicleâ€™s stability control system components.

9. What tools are needed to diagnose the C1940 code in a Toyota?

- Diagnosing the C1940 code typically requires an OBDII scan tool capable of reading chassis codes, a digital multimeter for testing wiring continuity and voltage, and possibly a scope to check sensor waveforms.