AutoCodes – GMC – C1220 2014 GMC Sierra

C1220 2014 GMC Sierra Code - Brake Pressure Sensor Supply Voltage Circuit High

Quick Answer

The Electronic Brake Control Module uses inputs from the Electronic Brake Control Brake Pedal Position Sensor to determine when the brake is applied and how much force is used. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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: C1220 2014 GMC Sierra indicates Brake Pressure Sensor Supply Voltage Circuit High.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module 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 217

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 Jul 13, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1220 2014 GMC Sierra Description

The Electronic Brake Control Module uses inputs from the Electronic Brake Control Brake Pedal Position Sensor to determine when the brake is applied and how much force is used. The Electronic Brake Control Module monitors when the driver's foot is on the brake and locks the offset. The offset is locked when three out of the four inputs indicate the brake pedal is applied. The four inputs are brake pedal travel 1, brake pedal travel 2, master cylinder pressure sensor, and brake pedal position sensor. These inputs are used to determine the driver's braking intent which is used to control the amount of pressure applied to the wheels.
Brake pressure sensor information is communicated from the Electronic Brake Control Module (EBCM) to the Hybrid Control Processor (HCP). This information is used to schedule regenerative braking and engine autostops.
The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module (ECM) detects a corrupted data message from the Electronic Brake Control Module.

OBDII Code C1220 2014 GMC Sierra - Brake Pressure Sensor Supply Voltage Circuit High - AutoCodes.com — C1220 2014 GMC Sierra Code - Brake Pressure Sensor Supply Voltage Circuit High

What does this mean?

What are the Possible Causes of the DTC C1220 2014 GMC Sierra?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection
Faulty Starter/Generator Control Module

How to Fix the DTC C1220 2014 GMC Sierra?

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 C1220 2014 GMC Sierra 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 C1220 2014 GMC Sierra code?

Need more information on how to fix the C1220 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 C1220 2014 GMC Sierra Code

1. What are common symptoms of OBDII code C1220 in a 2014 GMC Sierra related to the Brake Pressure Sensor Supply Voltage Circuit High?

Common symptoms include the ABS warning light illuminating on the dashboard, reduced braking performance, and potential activation of the vehicle's limp mode.

2. What are the possible causes of OBDII code C1220 in a 2014 GMC Sierra?

The code C1220 in a 2014 GMC Sierra is often triggered by issues such as a faulty brake pressure sensor, damaged wiring in the brake pressure sensor circuit, or a malfunctioning ABS module.

3. How can I diagnose the Brake Pressure Sensor Supply Voltage Circuit High issue in my 2014 GMC Sierra?

To diagnose the problem, you can use an OBDII scanner to read the trouble codes, inspect the brake pressure sensor and its wiring for any visible damage, and perform a comprehensive check of the ABS system components.

4. Are there any DIY repair tips for resolving OBDII code C1220 in a 2014 GMC Sierra?

While some basic troubleshooting like checking and cleaning the sensor connectors or resetting the ABS system may help, resolving the C1220 code often requires professional diagnostic tools and expertise to pinpoint and address the underlying issue effectively.

5. Can driving with OBDII code C1220 in a 2014 GMC Sierra be dangerous?

Continuing to drive with the C1220 code present can compromise the vehicle's braking system functionality, potentially leading to safety risks such as longer stopping distances or loss of ABS assistance in emergency braking situations. It is advisable to address the issue promptly.

6. How much does it typically cost to repair OBDII code C1220 in a 2014 GMC Sierra?

The cost of repairing the Brake Pressure Sensor Supply Voltage Circuit High issue can vary depending on the specific cause, parts needed for replacement, labor rates, and whether you choose to have the repair done at a dealership or an independent auto repair shop.

7. Is it necessary to reset the OBDII code C1220 after repairing the issue in a 2014 GMC Sierra?

Yes, it is recommended to clear the trouble codes using an OBDII scanner after resolving the C1220 problem to reset the ABS system and ensure that the warning light does not reappear due to a stored fault code.

8. Can extreme weather conditions affect the occurrence of OBDII code C1220 in a 2014 GMC Sierra?

Extreme temperatures or moisture exposure can potentially exacerbate existing issues related to the brake pressure sensor circuit, leading to the triggering of the C1220 code in your 2014 GMC Sierra.

9. How long does it typically take to repair the Brake Pressure Sensor Supply Voltage Circuit High issue in a 2014 GMC Sierra?

The repair time for addressing the C1220 code can vary based on the complexity of the problem, availability of parts, and the expertise of the technician. It is advisable to consult with a professional for a more accurate estimate.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code C1220 in a 2014 GMC Sierra?

While some simple troubleshooting steps can be attempted by DIY enthusiasts, resolving the Brake Pressure Sensor Supply Voltage Circuit High issue often requires specialized tools and expertise. It is recommended to seek professional help for an effective and safe repair.