AutoCodes – Generic – C12E4

C12E4 Code - ABS Sensor Reference Output Circuit

Quick Answer

The Electronic Brake Control Module (EBCM) monitors the ABS Sensor Reference. Common causes include Faulty ABS Sensor Reference, ABS Sensor Reference harness is open or shorted, ABS Sensor Reference 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: C12E4 indicates ABS Sensor Reference Output Circuit.
Common causes: Common causes include Faulty ABS Sensor Reference, ABS Sensor Reference harness is open or shorted, ABS Sensor Reference 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 727

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 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C12E4 Description

The Electronic Brake Control Module (EBCM) monitors the ABS Sensor Reference. The EBCM sets the OBDII code when the ABS Sensor Reference is not to factory specifications.

OBDII Code C12E4 - ABS Sensor Reference Output Circuit - AutoCodes.com — C12E4 Code - ABS Sensor Reference Output Circuit

What does this mean?

What are the Possible Causes of the DTC C12E4?

Faulty ABS Sensor Reference
ABS Sensor Reference harness is open or shorted
ABS Sensor Reference circuit poor electrical connection

How to Fix the DTC C12E4?

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 C12E4 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 C12E4 code?

Need more information on how to fix the C12E4 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

C12E4 Buick — ABS Sensor Reference Output Circuit
C12E4 Cadillac — ABS Sensor Reference Output Circuit
C12E4 Chevrolet — ABS Sensor Reference Output Circuit
C12E4 GMC — ABS Sensor Reference Output Circuit

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 C12E4 Code

What does the OBDII code C12E4 indicate?

The OBDII code C12E4 indicates a problem with the ABS sensor reference output circuit, which can affect the vehicle's anti-lock braking system.

What are the common symptoms of a C12E4 code?

Common symptoms include the ABS warning light illuminating on the dashboard, a decrease in braking performance, and potential loss of anti-lock brake functionality.

What could cause the C12E4 code to trigger?

Causes may include a faulty ABS sensor, damaged wiring or connectors in the ABS circuit, or issues with the ABS control module.

How can I diagnose the C12E4 code?

To diagnose the C12E4 code, check the ABS sensor and wiring for any visible damage, use a multimeter to test for continuity, and inspect the ABS control module for faults.

Can I drive my vehicle with a C12E4 code?

While you can drive the vehicle, it is not advisable, as the ABS system may not function correctly, increasing the risk of losing control during braking.

What are some common repair tips for the C12E4 code?

Repair tips include replacing any faulty ABS sensors, repairing damaged wiring, ensuring all connections are secure, and resetting the ABS control module if necessary.

How can I reset the C12E4 code after repairs?

You can reset the C12E4 code by using an OBDII scanner to clear the code or by disconnecting the vehicle's battery for a short period.

Is the C12E4 code specific to certain vehicle makes or models?

The C12E4 code can appear in various vehicle makes and models, particularly those equipped with an electronic anti-lock braking system (ABS).

What should I do if the C12E4 code keeps coming back after repairs?

If the C12E4 code reappears, further diagnosis may be needed to check for underlying issues, such as a faulty ABS control module or intermittent wiring problems.