AutoCodes – Generic – C1220

C1220 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 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 10,130

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

What does this mean?

What are the Possible Causes of the DTC C1220?

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?

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 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 code?

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

Need Help with the Code?

Get the C1220 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1220 Buick — Brake Pressure Sensor Supply Voltage Circuit High
C1220 Cadillac — Brake Pressure Sensor Supply Voltage Circuit High
C1220 Chevrolet — Brake Pressure Sensor Supply Voltage Circuit High
C1220 Ford — Yellow ABS Warning Indicator Failure
C1220 GMC — Brake Pressure Sensor Supply Voltage Circuit High
C1220 Lincoln — Yellow ABS Warning Indicator Failure
C1220 Mercury — Yellow ABS Warning Indicator Failure

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 Code

What does the OBDII code C1220 indicate?

C1220 indicates a problem with the brake pressure sensor supply voltage circuit being too high, which can affect the vehicle's braking system performance.

What are common symptoms of the C1220 code?

Common symptoms include an illuminated brake warning light on the dashboard, erratic brake performance, and potential issues with anti-lock braking system (ABS) functionality.

What are the possible causes of the C1220 code?

Possible causes include a faulty brake pressure sensor, damaged wiring or connectors in the circuit, or issues with the vehicleâ€™s main power supply affecting the sensor.

How can I diagnose the C1220 code?

To diagnose C1220, check the brake pressure sensor and its wiring for damage, measure the voltage at the sensor, and inspect the vehicle's electrical system for any faults.

What repairs are typically needed for the C1220 code?

Repairs may include replacing a faulty brake pressure sensor, repairing or replacing damaged wiring or connectors, or addressing issues in the vehicleâ€™s electrical system.

Can I drive my vehicle with the C1220 code?

While you may be able to drive the vehicle, it is not recommended due to potential braking issues, which could compromise safety.

How can I clear the C1220 code from the vehicleâ€™s computer?

The C1220 code can be cleared using an OBDII scanner after addressing the underlying issue, or by disconnecting the vehicleâ€™s battery for a short period.

Will the C1220 code cause my vehicle to fail an emissions test?

While C1220 itself is not directly related to emissions, an illuminated check engine light may cause the vehicle to fail an emissions test.

What should I do if the C1220 code keeps returning after repairs?

If the C1220 code returns, further diagnosis is needed to check for intermittent wiring issues, faulty components, or possible problems with the vehicleâ€™s control modules.