AutoCodes – Cadillac – C1234 Cadillac

C1234 Cadillac Code - Left Rear Wheel Speed Circuit Open or Shorted

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: C1234 Cadillac indicates Left Rear Wheel Speed Circuit Open or Shorted.
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.

Save to My Repairs My Repairs

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

Code Popularity 5,802

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 Aug 28, 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 C1234 Cadillac 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 C1234 Cadillac - Left Rear Wheel Speed Circuit Open or Shorted - AutoCodes.com — C1234 Cadillac Code - Left Rear Wheel Speed Circuit Open or Shorted

What does this mean?

What are the Possible Causes of the DTC C1234 Cadillac?

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 C1234 Cadillac?

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 C1234 Cadillac 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 C1234 Cadillac code?

Need more information on how to fix the C1234 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1234 Cadillac 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 C1234 Cadillac Code

1. What are common symptoms of OBDII code C1234 in a Cadillac indicating a Left Rear Wheel Speed Circuit Open or Shorted?

Symptoms may include the ABS warning light illuminating on the dashboard, the traction control system disabling, and potential issues with the vehicle's stability control.

2. What are some possible causes of the C1234 code in a Cadillac?

Potential causes include damaged wheel speed sensor wiring, a faulty wheel speed sensor, corrosion in the sensor connections, or an issue with the ABS module.

3. How can I diagnose the C1234 code in my Cadillac?

Diagnosis typically involves using a diagnostic scanner to retrieve the specific fault codes, inspecting the wheel speed sensor wiring and connections, and testing the sensor resistance and signal output.

4. Can I continue driving my Cadillac with the C1234 code present?

It is not recommended to drive the vehicle with the C1234 code active, as it could affect the proper functioning of the ABS and traction control systems, compromising safety.

5. How can I repair the Left Rear Wheel Speed Circuit Open or Shorted issue in my Cadillac?

Repair methods may include repairing or replacing damaged wiring, replacing the faulty wheel speed sensor, cleaning corrosion from connections, or addressing any issues with the ABS module.

6. Are there any DIY tips for fixing the C1234 code in a Cadillac?

While some basic troubleshooting steps can be taken, it is recommended to consult a professional mechanic with experience in ABS systems for accurate diagnosis and repair of the issue.

7. How much does it typically cost to fix the C1234 code in a Cadillac?

The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts, labor, and diagnostic services. It's best to get a quote from a trusted repair shop.

8. Will resetting the OBDII code clear the C1234 error in my Cadillac?

Resetting the code may temporarily clear the error, but if the underlying issue causing the C1234 code is not addressed, it is likely to reoccur. It's essential to diagnose and fix the root cause of the problem.

9. Can extreme weather conditions contribute to triggering the C1234 code in a Cadillac?

Extreme weather, particularly exposure to moisture and road salt, can accelerate corrosion in the wheel speed sensor connections and wiring, potentially leading to the Left Rear Wheel Speed Circuit Open or Shorted issue.

10. Is the C1234 code specific to Cadillac vehicles, or can it appear in other makes and models?

While the specific code may vary across different vehicle brands, issues related to wheel speed sensor circuits are common in ABS systems, and similar codes may appear in various makes and models.