AutoCodes – Lexus – C1940 Lexus

C1940 Lexus 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 Lexus 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 678

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

What does this mean?

What are the Possible Causes of the DTC C1940 Lexus?

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 Lexus?

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 Lexus 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.

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

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Get the C1940 Lexus 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 Lexus Code

1. What are the common symptoms of a Front Yaw Rate Sensor issue with OBDII code C1940 in a Lexus?

The common symptoms include the traction control light or stability control warning light illuminating on the dashboard, erratic behavior in steering and braking, and possible loss of vehicle stability.

2. What causes the OBDII code C1940 related to the Front Yaw Rate Sensor in a Lexus?

The code C1940 usually indicates a fault with the Front Yaw Rate Sensor itself, such as internal sensor failure, wiring issues, or sensor calibration problems.

3. How serious is an OBDII code C1940 related to the Front Yaw Rate Sensor in a Lexus?

This code is considered serious as it affects the vehicle's stability control system, potentially compromising the vehicle's handling and safety on the road.

4. Can driving with the OBDII code C1940 related to the Front Yaw Rate Sensor in a Lexus be dangerous?

Yes, driving with this code present can be dangerous as it may lead to unpredictable handling behavior, especially in emergency situations or adverse road conditions.

5. How can I diagnose the issue causing the OBDII code C1940 related to the Front Yaw Rate Sensor in my Lexus?

Diagnosis typically involves using a professional OBDII scanner to retrieve the specific fault code, performing a visual inspection of the sensor and its wiring, and potentially testing the sensor's output using diagnostic tools.

6. Is it possible to reset or clear the OBDII code C1940 related to the Front Yaw Rate Sensor in a Lexus?

While clearing the code may temporarily turn off the warning lights, the underlying issue with the Front Yaw Rate Sensor should be diagnosed and repaired to ensure safe vehicle operation.

7. How can I repair the Front Yaw Rate Sensor issue causing the OBDII code C1940 in my Lexus?

Repair options may include replacing the Front Yaw Rate Sensor, repairing or replacing damaged wiring, recalibrating the sensor, or addressing any underlying issues identified during diagnosis.

8. Can I drive my Lexus with the OBDII code C1940 related to the Front Yaw Rate Sensor until I can get it repaired?

It is not recommended to drive the vehicle with this code present, as it can compromise the vehicle's stability and safety systems, potentially leading to hazardous driving conditions.

9. Are there any DIY fixes for the OBDII code C1940 related to the Front Yaw Rate Sensor in a Lexus?

DIY fixes for this code may be limited, as it often requires specialized diagnostic equipment and expertise to accurately diagnose and repair Front Yaw Rate Sensor issues.

10. How much does it typically cost to repair the Front Yaw Rate Sensor issue causing the OBDII code C1940 in a Lexus?

The cost of repair can vary depending on the specific issue with the sensor, labor rates, and whether genuine Lexus parts are used. It is advisable to consult with a professional mechanic or dealership for an accurate estimate.