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Engine-Codes – GMC – C1235 GMC

C1235 GMC Code - Right Rear Wheel Speed Circuit Open or Shorted

Quick Answer

The C1235 GMC code indicates that there is an issue with the right rear wheel speed circuit, specifically that it is either open or shorted. Common causes include Damaged or corroded wheel speed sensor wiring, Faulty wheel speed sensor in the right rear wheel, Issues with the ABS control module. 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
C1235 GMC indicates Right Rear Wheel Speed Circuit Open or Shorted.
Common causes
Common causes include Damaged or corroded wheel speed sensor wiring, Faulty wheel speed sensor in the right rear wheel, Issues with the ABS control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code C1235 GMC Description

The C1235 GMC code indicates that there is an issue with the right rear wheel speed circuit, specifically that it is either open or shorted. This circuit is a crucial component of the vehicle's anti-lock braking system (ABS) and traction control system. When this circuit is compromised, it can lead to significant safety concerns and affect the overall performance of the vehicle.

OBDII Code C1235 GMC - Right Rear Wheel Speed Circuit Open or Shorted
C1235 GMC Code - Right Rear Wheel Speed Circuit Open or Shorted

Common Causes of C1235 GMC

  1. Damaged or corroded wheel speed sensor wiring
  2. Faulty wheel speed sensor in the right rear wheel
  3. Issues with the ABS control module
  4. Poor electrical connections or loose wiring in the circuit
  5. Water or debris intrusion in the wheel speed sensor connector

Symptoms of C1235 GMC

  1. Illumination of the ABS warning light on the dashboard
  2. Traction control system engaging inconsistently or not at all
  3. Increased stopping distances during braking
  4. Unusual noises coming from the right rear wheel area
  5. Uneven braking or pulling to one side during braking

How to Fix C1235 GMC

  1. Begin by visually inspecting the wiring and connector of the right rear wheel speed sensor for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the circuit and check for any open or shorted connections.
  3. If the wiring and connections are intact, replace the right rear wheel speed sensor with a new, OEM-quality sensor.
  4. Clear the diagnostic trouble codes from the ABS control module using a diagnostic scan tool.
  5. Perform a road test to ensure that the ABS and traction control systems are functioning properly and that the issue has been resolved.

Cost to Fix C1235 GMC

The typical repair costs for addressing a C1235 GMC code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of replacing a wheel speed sensor can range from $100 to $300, including parts and labor. Additional costs may apply if there are underlying wiring issues or problems with the ABS control module. It is advisable to consult with a trusted mechanic or dealership for a more accurate cost estimate based on your vehicle's make and model.

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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 C1235 GMC Code

1. What are the common symptoms of OBDII code C1235 for a GMC vehicle?

The common symptoms include ABS warning light illuminated on the dashboard, traction control system malfunction, and potential loss of stability control.

2. What are the possible causes of OBDII code C1235 indicating a Right Rear Wheel Speed Circuit Open or Shorted in a GMC?

Potential causes may include a damaged or corroded wheel speed sensor, faulty wiring or connectors in the right rear wheel speed circuit, or a malfunctioning ABS module.

3. How can I diagnose the issue related to OBDII code C1235 in my GMC vehicle?

Diagnosing the problem involves visually inspecting the wheel speed sensor and its wiring for any visible damage, testing the sensor's resistance, checking the wiring and connectors for continuity, and using a scan tool to monitor wheel speed sensor data.

4. Is it safe to drive my GMC vehicle with OBDII code C1235 triggered?

It is not recommended to drive the vehicle with this code active, as it may affect the proper functioning of the ABS and traction control systems, potentially compromising safety on the road.

5. Can I repair OBDII code C1235 in my GMC myself, or should I seek professional help?

While some DIY enthusiasts may attempt to repair this issue by replacing the wheel speed sensor or fixing wiring problems, it is advisable to consult a qualified mechanic or technician for accurate diagnosis and repair.

6. Are there any specific maintenance tips to prevent OBDII code C1235 from recurring in my GMC?

Regularly inspecting the wheel speed sensors and their wiring for signs of damage, ensuring proper wheel alignment and tire condition, and promptly addressing any ABS warning lights can help prevent the recurrence of this code.

7. Will fixing OBDII code C1235 in my GMC be expensive?

The cost of repair may vary depending on the exact cause of the issue, the parts needed for replacement, and the labor charges. It is recommended to obtain quotes from different repair shops for comparison.

8. How long does it typically take to repair OBDII code C1235 in a GMC vehicle?

The repair time can vary based on the complexity of the issue and the availability of parts. In general, a skilled mechanic can address this problem within a few hours to a day.

9. Can OBDII code C1235 be triggered intermittently in a GMC vehicle?

Yes, the code may sometimes appear intermittently due to loose connections, intermittent sensor failure, or other factors. It is essential to address the issue promptly to prevent further problems.

10. Will resetting the OBDII code C1235 in my GMC make the problem disappear permanently?

Simply resetting the code without addressing the underlying issue will not resolve the problem permanently. It is crucial to diagnose and repair the root cause to prevent the code from reappearing.

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