AutoCodes – GMC – C128C GMC

C128C GMC Code - ABS Regenerative Axle Pressure Sensor Offset Error

Quick Answer

The Electronic Brake Control Module (EBCM) uses input from the regenerative axle pressure sensor for more accurate control during a brake and vehicle stability enhancement system event. Common causes include Faulty Brake Pressure Modulator, Brake Pressure Modulator harness is open or shorted, Brake Pressure Modulator 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: C128C GMC indicates ABS Regenerative Axle Pressure Sensor Offset Error.
Common causes: Common causes include Faulty Brake Pressure Modulator, Brake Pressure Modulator harness is open or shorted, Brake Pressure Modulator 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 958

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 Sep 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C128C GMC Description

OBDII Code C128C GMC - ABS Regenerative Axle Pressure Sensor Offset Error - AutoCodes.com — C128C GMC Code - ABS Regenerative Axle Pressure Sensor Offset Error

What does this mean?

What are the Possible Causes of the DTC C128C GMC?

Faulty Brake Pressure Modulator
Brake Pressure Modulator harness is open or shorted
Brake Pressure Modulator circuit poor electrical connection

How to Fix the DTC C128C GMC?

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 C128C GMC 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 C128C GMC code?

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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 C128C GMC Code

1. What are the common symptoms of OBDII code C128C GMC (ABS Regenerative Axle Pressure Sensor Offset Error)?

The common symptoms include the ABS warning light being illuminated on the dashboard, potential loss of ABS functionality, and unusual braking behavior.

2. What could cause the OBDII code C128C GMC to trigger?

This code may be triggered by a faulty regenerative axle pressure sensor, sensor offset error, wiring issues, or problems with the ABS control module.

3. How can I diagnose the ABS Regenerative Axle Pressure Sensor Offset Error?

Diagnosis typically involves using an OBDII scanner to read and interpret the fault code, conducting a visual inspection of the sensor and its wiring, and performing a sensor calibration procedure.

4. Can driving with the OBDII code C128C GMC present cause further damage?

Continuing to drive with this error code may result in compromised ABS performance and potentially unsafe braking conditions. It is recommended to address the issue promptly.

5. What are some repair tips for addressing the ABS Regenerative Axle Pressure Sensor Offset Error?

Repair options may include recalibrating the sensor, repairing or replacing faulty wiring, replacing the sensor itself, or addressing any issues with the ABS control module.

6. Is it safe to drive my vehicle with the ABS warning light on due to this error code?

Driving with the ABS warning light on is not recommended, as it signifies a potential issue with the anti-lock braking system. It is advised to have the problem diagnosed and repaired as soon as possible.

7. Can I reset the OBDII code C128C GMC myself, or do I need a professional to do it?

While you can clear the fault code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring. If you are unsure about the repairs needed, consulting a professional is recommended.

8. How much does it typically cost to repair the ABS Regenerative Axle Pressure Sensor Offset Error?

Costs can vary depending on the exact cause of the issue, the extent of repairs needed, and whether any parts need to be replaced. It is advisable to get a diagnosis from a mechanic for an accurate estimate.

9. Are there any preventive maintenance steps to avoid encountering the ABS Regenerative Axle Pressure Sensor Offset Error?

Regularly inspecting the ABS system, including sensors and wiring, as part of routine maintenance can help identify potential issues early and prevent the occurrence of error codes like C128C.

10. Will the ABS system still function if the OBDII code C128C GMC is not addressed immediately?

Addressing the ABS Regenerative Axle Pressure Sensor Offset Error promptly is important to ensure the ABS system functions properly. Ignoring the issue may lead to ABS malfunctions and compromised braking performance.