AutoCodes – Generic – C1794

C1794 Code - Front Speed Sensor Right Circuit Malfunction

Quick Answer

This circuit receives the speed detected by the speed sensor from the Skid Control ECU. Common causes include Faulty Front Speed Sensor Right, Front Speed Sensor Right harness is open or shorted, Front Speed Sensor Right 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: C1794 indicates Front Speed Sensor Right Circuit Malfunction.
Common causes: Common causes include Faulty Front Speed Sensor Right, Front Speed Sensor Right harness is open or shorted, Front Speed Sensor Right 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 1,065

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 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1794 Description

This circuit receives the speed detected by the speed sensor from the Skid Control ECU. The Skid Control ECU monitors the Front Speed Sensor Right. The Skid Control ECU sets the OBDII code when the Front Speed Sensor Right is not to factory specifications.

OBDII Code C1794 - Front Speed Sensor Right Circuit Malfunction - AutoCodes.com — C1794 Code - Front Speed Sensor Right Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C1794?

Faulty Front Speed Sensor Right
Front Speed Sensor Right harness is open or shorted
Front Speed Sensor Right circuit poor electrical connection
Faulty Skid Control ECU

How to Fix the DTC C1794?

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 C1794 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 C1794 code?

Need more information on how to fix the C1794 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1794 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1794 Lexus — Front Speed Sensor Right Circuit Malfunction
C1794 Toyota — Front Speed Sensor Right Circuit Malfunction

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 C1794 Code

1. What are the common symptoms of OBDII code C1794, Front Speed Sensor Right Circuit Malfunction?

- Common symptoms include ABS warning light illuminated on the dashboard, traction control issues, and potential loss of stability control.

2. What are the possible causes of OBDII code C1794?

- The code can be triggered by a faulty front right speed sensor, damaged wiring or connectors, or issues with the ABS control module.

3. How can I diagnose the Front Speed Sensor Right Circuit Malfunction?

- Diagnosis involves using an OBDII scanner to read the code, inspecting the front right speed sensor and its wiring for damage, and performing a continuity test.

4. Can I continue driving with OBDII code C1794 present?

- It is not recommended to drive with this code active, as it can affect the vehicle's ABS and stability control systems, compromising safety.

5. How can I repair OBDII code C1794?

- Repair options include replacing the front right speed sensor, repairing damaged wiring or connectors, and resetting the fault code using an OBDII scanner.

6. Are there any DIY tips for fixing OBDII code C1794?

- DIY enthusiasts can attempt to visually inspect the sensor and wiring for damage, but professional diagnosis and repair are recommended for accurate resolution.

7. Can weather or road conditions trigger OBDII code C1794?

- Extreme weather conditions or driving on rough terrain can potentially lead to sensor damage, which may trigger the Front Speed Sensor Right Circuit Malfunction code.

8. How much does it typically cost to repair OBDII code C1794 at a mechanic or dealership?

- Repair costs can vary depending on the extent of the issue and labor rates, but expect to pay anywhere from $100 to $300 for parts and labor.

9. Will OBDII code C1794 cause a vehicle to fail a state inspection?

- Yes, in many states, a malfunctioning ABS system can cause a vehicle to fail inspection due to safety concerns related to braking and stability control.

10. How can I prevent OBDII code C1794 from recurring in the future?

- Regular maintenance, such as checking and cleaning sensors, inspecting wiring harnesses, and addressing any issues promptly, can help prevent the recurrence of this code.