AutoCodes – GMC – C1220 2015 GMC Sierra

C1220 2015 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 2015 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 262

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 2015 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 2015 GMC Sierra - Brake Pressure Sensor Supply Voltage Circuit High - AutoCodes.com — C1220 2015 GMC Sierra Code - Brake Pressure Sensor Supply Voltage Circuit High

What does this mean?

What are the Possible Causes of the DTC C1220 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the C1220 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code C1220 in a 2015 GMC Sierra related to the Brake Pressure Sensor Supply Voltage Circuit High?

- Common symptoms include the illumination of the ABS warning light on the dashboard, decreased brake performance, and potential issues with the vehicle's stability control system.

2. What are the possible causes of OBDII code C1220 in a 2015 GMC Sierra?

- The code C1220 typically indicates a fault in the brake pressure sensor supply voltage circuit, which can be caused by issues such as a faulty brake pressure sensor, damaged wiring or connectors, or a problem with the ABS control module.

3. How can I diagnose the Brake Pressure Sensor Supply Voltage Circuit High issue in my 2015 GMC Sierra?

- To diagnose the problem, you can use an OBDII scanner to retrieve the specific fault code (C1220). Additionally, a thorough visual inspection of the brake pressure sensor, wiring, and connectors can help identify any visible issues.

4. Is it safe to continue driving my 2015 GMC Sierra with OBDII code C1220 related to the Brake Pressure Sensor Supply Voltage Circuit High?

- It is not recommended to drive the vehicle with this issue as it may affect the proper functioning of the braking system and compromise overall safety. It is advisable to address the problem promptly.

5. How can I repair OBDII code C1220 in my 2015 GMC Sierra?

- Repairing the Brake Pressure Sensor Supply Voltage Circuit High issue may involve replacing the faulty brake pressure sensor, repairing damaged wiring or connectors, or addressing any underlying issues with the ABS control module.

6. Can a DIY enthusiast fix the OBDII code C1220 in a 2015 GMC Sierra?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing issues related to the brake pressure sensor supply voltage circuit may require specialized tools and expertise. It is advisable to consult a professional mechanic for proper diagnosis and repair.

7. How much does it typically cost to repair OBDII code C1220 in a 2015 GMC Sierra?

- The cost of repairing the Brake Pressure Sensor Supply Voltage Circuit High issue can vary depending on the specific cause of the problem, the extent of the repairs needed, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.

8. Will resetting the OBDII code C1220 in my 2015 GMC Sierra make the problem go away?

- Resetting the fault code may temporarily turn off the warning light, but it will not fix the underlying issue causing the Brake Pressure Sensor Supply Voltage Circuit High fault. It is important to diagnose and address the root cause of the problem to ensure proper functionality.

9. Can extreme weather conditions contribute to triggering OBDII code C1220 in a 2015 GMC Sierra?

- While extreme weather conditions may not directly cause the Brake Pressure Sensor Supply Voltage Circuit High fault, they can potentially exacerbate existing issues with the brake pressure sensor, wiring, or connectors. It is important to keep the vehicle well-maintained in all conditions.

10. Are there any recalls or technical service bulletins related to OBDII code C1220 in a 2015 GMC Sierra?

- It is recommended to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to the specific OBDII code C1220 in a 2015 GMC Sierra. Keeping up to date with such information can help in addressing known issues promptly.