AutoCodes – Generic – C1940

C1940 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 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.

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Code Popularity 7,044

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

What does this mean?

What are the Possible Causes of the DTC C1940?

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?

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 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 code?

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

Need Help with the Code?

Get the C1940 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1940 Lexus — Front Yaw Rate Sensor
C1940 Toyota — Front Yaw Rate Sensor

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 Code

1. What are the common symptoms of OBDII code C1940 related to the Front Yaw Rate Sensor?

- Common symptoms include stability control issues, traction control malfunctions, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code C1940 for the Front Yaw Rate Sensor?

- Possible causes include a faulty yaw rate sensor, damaged wiring or connectors, sensor calibration issues, or a malfunctioning electronic control unit (ECU).

3. How can I diagnose the Front Yaw Rate Sensor issue triggering OBDII code C1940?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific fault code, testing the sensor's electrical connections, and checking for any physical damage to the sensor.

4. Can a DIY enthusiast repair the Front Yaw Rate Sensor issue causing OBDII code C1940?

- While basic checks like inspecting connections can be done by enthusiasts, repairing or replacing the yaw rate sensor often requires specialized tools and expertise, best left to professional technicians.

5. Is it safe to continue driving with OBDII code C1940 related to the Front Yaw Rate Sensor?

- It is not recommended to drive with this issue unresolved, as it can affect the vehicle's stability control system and compromise overall safety on the road.

6. How much does it typically cost to repair the Front Yaw Rate Sensor issue triggering OBDII code C1940?

- Repair costs can vary depending on the extent of the issue, but replacing a faulty yaw rate sensor can range from $200 to $500, including parts and labor.

7. Are there any preventive maintenance tips to avoid OBDII code C1940 related to the Front Yaw Rate Sensor?

- Regular vehicle inspections and maintenance, including checking for loose connections and ensuring proper sensor calibration, can help prevent issues with the yaw rate sensor.

8. Can weather conditions or rough driving affect the Front Yaw Rate Sensor and trigger OBDII code C1940?

- Extreme weather conditions or rough driving can potentially damage the sensor or its connections, leading to issues that trigger the OBDII code C1940.

9. How long does it usually take to repair the Front Yaw Rate Sensor problem associated with OBDII code C1940?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but technicians typically require a few hours to diagnose and fix the problem.

10. Will resetting the OBDII system clear the Front Yaw Rate Sensor error code C1940?

- Resetting the OBDII system may temporarily clear the error code, but if the underlying issue with the Front Yaw Rate Sensor is not addressed, the code is likely to reappear.