AutoCodes – Chevrolet – C1220 2018 Chevrolet Silverado

C1220 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 158

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Brake Pressure Sensor Supply Voltage Circuit High - AutoCodes.com — C1220 2018 Chevrolet Silverado Code - Brake Pressure Sensor Supply Voltage Circuit High

What does this mean?

What are the Possible Causes of the DTC C1220 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the C1220 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code C1220 in a 2018 Chevrolet Silverado?

The common symptoms of code C1220 (Brake Pressure Sensor Supply Voltage Circuit High) in a 2018 Chevrolet Silverado may include the ABS warning light illuminating on the dashboard, potential loss of ABS functionality, and possible issues with the vehicle's brake system.

2. What does the OBDII code C1220 indicate in a 2018 Chevrolet Silverado?

OBDII code C1220 in a 2018 Chevrolet Silverado indicates a fault with the brake pressure sensor supply voltage circuit, specifically a high voltage condition being detected.

3. What are the possible causes of OBDII code C1220 in a 2018 Chevrolet Silverado?

Possible causes of code C1220 in a 2018 Chevrolet Silverado include a faulty brake pressure sensor, damaged wiring or connectors in the brake pressure sensor circuit, or a malfunctioning ABS module.

4. How can I diagnose OBDII code C1220 in a 2018 Chevrolet Silverado?

Diagnosing code C1220 in a 2018 Chevrolet Silverado typically involves using an OBDII scanner to retrieve the code, inspecting the brake pressure sensor and its wiring for any visible damage, and performing voltage tests to identify the high voltage circuit.

5. Is it safe to drive a 2018 Chevrolet Silverado with OBDII code C1220 present?

It is not recommended to drive a 2018 Chevrolet Silverado with OBDII code C1220 present, as it can affect the proper functioning of the ABS system and potentially compromise the vehicle's braking performance.

6. Can I repair OBDII code C1220 in a 2018 Chevrolet Silverado myself?

Depending on your mechanical skills and access to the necessary tools, you may be able to repair code C1220 in a 2018 Chevrolet Silverado yourself by replacing the faulty brake pressure sensor, repairing damaged wiring, or addressing any other identified issues.

7. Will resetting the OBDII code C1220 in a 2018 Chevrolet Silverado make it go away permanently?

Resetting the OBDII code C1220 in a 2018 Chevrolet Silverado may temporarily clear the code, but if the underlying issue causing the high voltage circuit problem is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair OBDII code C1220 in a 2018 Chevrolet Silverado at a dealership or repair shop?

The cost of repairing OBDII code C1220 in a 2018 Chevrolet Silverado at a dealership or repair shop can vary depending on the specific issue, but it may involve diagnostic fees, parts replacement costs, and labor charges, potentially ranging from a few hundred to over a thousand dollars.

9. Can OBDII code C1220 in a 2018 Chevrolet Silverado cause other problems if left unaddressed?

If left unaddressed, OBDII code C1220 in a 2018 Chevrolet Silverado can potentially lead to further issues with the ABS system, compromise vehicle safety, and trigger additional warning lights or error codes related to the brake system.

10. How long does it typically take to repair OBDII code C1220 in a 2018 Chevrolet Silverado?

The time it takes to repair OBDII code C1220 in a 2018 Chevrolet Silverado can vary based on the specific cause of the issue and the complexity of the repair needed, but it may range from a few hours to a full day, depending on the extent of the diagnostic and repair work required.