Fault Code C12E5 Chevrolet: Brake Pedal Position Sensor Reference Circuit

When your Chevrolet's onboard computer detects a malfunction in the brake pedal position sensor reference circuit, it triggers the C12E5 fault code.

This can cause issues with your brake system, traction control, and overall vehicle safety.

You may notice symptoms like the ABS warning light or engine light illuminating, intermittent or faulty brake system operation, or unusual noises when braking.

Common causes include a faulty brake pedal position sensor, open or shorted sensor harness, or poor electrical connections.

To diagnose and repair the issue, you'll need to perform a diagnostic system check and inspect the sensor circuits.

Key Takeaways

• The C12E5 Chevrolet code indicates a fault in the brake pedal position sensor reference circuit, affecting ABS and traction control systems.
• A faulty brake pedal position sensor or poor electrical connection in the sensor circuit can cause the C12E5 code to appear.
• To diagnose the issue, use a scan tool to monitor the brake pedal position sensor signal and voltage reference circuit, and inspect the sensor1 signal circuit for shorts to voltage.
• Replacing the faulty brake pedal position sensor and performing a brake sensor calibration can effectively resolve the C12E5 code issue.
• It is essential to verify proper installation and connection of the brake pedal position sensor to prevent the C12E5 code from reappearing in the future.

Symptoms of the C12E5 Chevrolet Code in Chevrolet Vehicles

When the C12E5 code is triggered in your Chevrolet vehicle, you may notice the Anti-Lock Brake System (ABS) Warning Light and/or the Engine Light (or Service Engine Soon Warning Light) illuminating on your dashboard.

This code is related to the Brake Pedal Position Sensor, which is monitored by the Electronic Brake Control Module (EBCM). If the sensor isn't functioning correctly, it can affect traction control and overall vehicle safety.

You may experience:

• The ABS Warning Light and/or Engine Light staying on
• Intermittent or faulty brake system operation
• Difficulty stopping or slowing down
• Unusual noises or vibrations when braking
• Reduced traction control performance

Common Causes of the C12E5 Chevrolet Code: A Diagnostic Overview

To diagnose the C12E5 Chevrolet code, you'll need to investigate a few common culprits that could be causing the problem, starting with the Brake Pedal Position Sensor itself.

This sensor plays a vital role in the brake system, and any issues with it can trigger the code.

To get to the bottom of the issue, you'll need to connect a scan tool to the vehicle's onboard computer to read the trouble code and inspect the reference circuit.

Some common causes of the C12E5 code include:

• Faulty Brake Pedal Position Sensor
• Open or shorted Brake Pedal Position Sensor harness
• Poor electrical connection in the Brake Pedal Position Sensor circuit
• Other potential causes not listed

Check for safety recalls on the vehicle.

How to Diagnose the C12E5 Chevrolet Code: Step-by-Step Procedure

To diagnose the C12E5 Chevrolet code, start by performing a Diagnostic System Check - Vehicle to verify all necessary conditions are met.

Then, review the Strategy Based Diagnosis for an overview of the diagnostic approach and Diagnostic Procedure Instructions for specific details on the brake control brake pedal position sensor circuit.

Check for shorts to ground or voltage on the 5V reference circuit to the brake control brake pedal position sensor.

Inspect the sensor1 signal circuit for any shorts to voltage.

Use a scan tool to monitor the brake pedal position sensor signal and voltage reference circuit.

If the brake pedal position sensor is found to be faulty, replace it and relearn the sensor in the Engine Control Module (ECM) and Body Control Module (BCM).

Consult factory service manuals for guidance and seek professional diagnosis and repair if needed.

Effective Solutions: Repairing the C12E5 Chevrolet Code

Now that you've identified the faulty brake pedal position sensor as the root cause of the C12E5 Chevrolet code, replacing it with a new one is the most effective solution to repair the issue.

This will guarantee your vehicle's safety features are functioning properly, and you can drive with confidence.

To complete the repair, follow these steps:

• Purchase a replacement brake pedal position sensor that meets OEM specifications
• Disconnect the battery to prevent any accidental starts
• Remove the faulty sensor and replace it with the new one
• Reconnect the electrical wiring, securing tight connections
• Perform Brake Sensor Calibration to synchronize the new sensor with your vehicle's computer

Cost Analysis and Essencial Tools for Resolving the C12E5 Chevrolet Code

When resolving the C12E5 Chevrolet code, you'll need to factor in the cost of essential tools and replacement parts, which can add up quickly.

As you plan your budget, consider the following expenses:

A code reader or scan tool, ranging from $20 to $1,000 or more

A wiring diagram and multimeter, starting at around $10

Replacing the brake pedal position sensor, with prices ranging from $50 to $200 or more

A relearn procedure, which may require a scan tool or a dealership visit

Labor costs, ranging from $75 to $150 per hour, depending on the location and shop rates

Preventive Measures to Avoid the C12E5 Chevrolet Code in the Future

By considering the costs associated with resolving the C12E5 Chevrolet code, you're likely motivated to take proactive steps to prevent its recurrence in the future.

To avoid this code, follow these preventive measures:

• Verify proper installation and connection of the brake pedal position sensor to the electronic brake control module.
• Regularly inspect the 5V reference circuit and sensor1 signal circuit for damage or corrosion and repair or replace them as needed.
• Relearn the sensor in both the Engine Control Module (ECM) and Body Control Module (BCM) when replacing the brake pedal position sensor.
• Use a scan tool to clear DTCs and navigate to the configuration and reset functions for the BCM and ECM modules during the relearning process.
• Refer to the GM Repair Information and the Service Resets and Relearns menu for specific guidance on brake pedal position sensor replacement and relearning.

Chevrolet Models Most Affected by the C12E5 Chevrolet Code

You'll typically find the C12E5 code plaguing certain Chevrolet models, including the 2014-2019 Silverado 1500, 2015-2019 Tahoe, and 2015-2019 Suburban, which are prone to brake pedal position sensor issues.

These models, part of Chevy's history, have undergone significant design evolution, but some design flaws still persist.

The C12E5 code is more common in models equipped with the electronic brake control module, which supplies a 5V reference to the brake control brake pedal position sensor.

2014-2016 Chevrolet Impala

2013-2015 Chevrolet Traverse

2013-2015 Chevrolet Equinox

2016-2019 Chevrolet Cruze

Other models may also be affected, but these are the most common ones.

Related Fault Codes to C12E5 Chevrolet Code

If your Chevrolet is throwing a C12E5 code, it's vital to check for related fault codes that may be contributing to the issue, as multiple codes can trigger simultaneously.

This is where Fault Code Analysis comes in - a process that helps identify underlying problems. When dealing with Brake Sensor Failure, using Diagnostic Tools to scan for other codes is imperative.

Some related fault codes to look out for:

U0121: Lost Communication** with Anti-Lock Brake System (ABS) Control Module

**C0035: Brake Pedal Position Sensor Circuit

*C0040: Brake Pedal Position Sensor Circuit Performance

*U0100: Lost Communication with Engine Control Module (ECM)

*C0128: Brake Pedal Position Sensor Circuit Low Voltage

Frequently Asked Questions

What Happens When the Brake Pedal Position Sensor Fails?

When the brake pedal position sensor fails, it can cause erratic shifting, leading to unpredictable braking performance. This can compromise your safety on the road.

You may notice the Anti-Lock Brake System (ABS) Warning Light or Engine Light turning on, indicating a problem with the brake system.

It's crucial to address the issue promptly to avoid accidents and further damage to your vehicle.

Where Is the Brake Pedal Position Sensor Located?

The brake pedal position sensor is typically mounted on the brake pedal assembly, integrated into the brake pedal design. It's usually attached to the pedal arm or brake pedal bracket.

Look for the sensor connected to the wiring harness, which runs from the sensor to the Electronic Brake Control Module (EBCM).

During inspection, carefully examine the wiring harness for any signs of damage or corrosion.

What Type of Sensor Is a Brake Pedal Position Sensor?

A brake pedal position sensor is a type of potentiometer sensor. It measures the pedal's movement and position.

As you press the brake pedal, the sensor detects the change in pedal operation and sends an electrical signal to the Electronic Brake Control Module (EBCM) through a specific circuit design.

This signal helps the EBCM monitor and control the brake system.

What Does the P057C Code Mean?

P057C indicates a problem with the brake pedal position sensor's calibration or reference circuit.

This could be due to a faulty calibration, sensor malfunction, or wiring issues.

The vehicle's computer is saying that the sensor's output isn't within the expected range, which can affect the anti-lock braking system.

You'll need to have it diagnosed and repaired to guarantee your safety on the road.

Conclusion

Fault Code C12E5 on your Chevrolet indicates a Brake Pedal Position Sensor Reference Circuit issue.

Careful diagnosis is crucial to identify the root cause. Check for electrical connection problems and potentially replace the Brake Pedal Position Sensor.

If needed, seek professional help.

Take preventive measures to avoid this issue in the future.