AutoCodes – Generic – C1223

C1223 Code - Left Rear Wheel Speed Sensor Input Signal Is Zero

Quick Answer

As the wheel spins, the wheel speed sensor produces an AC signal. Common causes include Faulty Hub Assembly (Left Rear Wheel Speed Sensor is part of hub assembly), Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted. 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: C1223 indicates Left Rear Wheel Speed Sensor Input Signal Is Zero.
Common causes: Common causes include Faulty Hub Assembly (Left Rear Wheel Speed Sensor is part of hub assembly), Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted.
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 47,326

How popular is this code, among other codes? Medium

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 Aug 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1223 Description

As the wheel spins, the wheel speed sensor produces an AC signal. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The EBCM will set the OBDII code when the sensor is not to factory specifications.

OBDII Code C1223 - Left Rear Wheel Speed Sensor Input Signal Is Zero - AutoCodes.com — C1223 Code - Left Rear Wheel Speed Sensor Input Signal Is Zero

What does this mean?

What are the Possible Causes of the DTC C1223?

Faulty Hub Assembly (Left Rear Wheel Speed Sensor is part of hub assembly)
Faulty Left Rear Wheel Speed Sensor
Left Rear Wheel Speed Sensor harness is open or shorted
Left Rear Wheel Speed Sensor circuit poor electrical connection

How to Fix the DTC C1223?

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 C1223 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 C1223 code?

Need more information on how to fix the C1223 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1223 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1223 Buick — Left Rear Wheel Speed Sensor Input Signal Is Zero
C1223 Cadillac — Left Rear Wheel Speed Sensor Input Signal Is Zero
C1223 Chevrolet — Left Rear Wheel Speed Sensor Input Signal Is Zero
C1223 Ford — Brake Light Warning Output Circuit Failure
C1223 GMC — Left Rear Wheel Speed Sensor Input Signal Is Zero
C1223 Lexus — ABS Control System Malfunction
C1223 Lincoln — Brake Light Warning Output Circuit Failure
C1223 Mercury — Brake Light Warning Output Circuit Failure
C1223 Pontiac — Left Rear Wheel Speed Sensor Input Signal Is Zero
C1223 Scion — ABS Control System Malfunction
C1223 Toyota — ABS Control System 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 C1223 Code

What does the OBDII code C1223 mean?

The OBDII code C1223 indicates that the left rear wheel speed sensor input signal is zero, meaning the vehicle's system is not receiving any data from the left rear wheel speed sensor.

What are the common symptoms of a C1223 code?

Common symptoms include the ABS warning light illuminating on the dashboard, erratic braking behavior, and potential loss of anti-lock braking system (ABS) functionality.

What causes the C1223 code to trigger?

The C1223 code can be triggered by a faulty left rear wheel speed sensor, damaged wiring or connectors, or issues with the ABS control module.

How can I diagnose the C1223 code?

To diagnose the C1223 code, check the left rear wheel speed sensor's wiring and connectors for damage, test the sensor's resistance and output signal, and use a scan tool to monitor the wheel speed data while driving.

What should I do if the left rear wheel speed sensor appears to be faulty?

If the left rear wheel speed sensor is faulty, it should be replaced with a new sensor, and the system should be re-tested to ensure the issue is resolved.

Can I drive my vehicle with a C1223 code?

While you can drive your vehicle with a C1223 code, it is not advisable as it may affect braking performance and safety due to the malfunctioning ABS system.

How much does it typically cost to repair a C1223 code?

Repair costs for a C1223 code can vary widely, but replacing a wheel speed sensor generally ranges from $100 to $300, including parts and labor.

Are there any temporary fixes for the C1223 code?

Temporary fixes may include checking and securing the wiring and connectors, but the best solution is to replace the faulty sensor to ensure proper functionality.

What tools do I need to fix the C1223 code?

To fix the C1223 code, you typically need basic hand tools, a multimeter for testing electrical components, and possibly a scan tool to clear the code after repairs.

Will clearing the code fix the problem?

Clearing the C1223 code will not fix the underlying issue. It is essential to diagnose and repair the cause of the code before clearing it to ensure the problem does not reoccur.