C1220 Buick 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 Buick 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.
Code C1220 Buick Description
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.
What are the Possible Causes of the DTC C1220 Buick?
- 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 Buick?
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 Buick 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.
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Frequently Asked Questions about C1220 Buick Code
1. What does the OBDII code C1220 mean on a Buick?
C1220 indicates a problem with the brake pressure sensor supply voltage circuit, specifically that the voltage is higher than the expected range.
2. What are common symptoms of the C1220 code on a Buick?
Common symptoms include the ABS warning light illuminated, reduced or malfunctioning ABS operation, and potentially a loss of traction control functionality.
3. What causes the C1220 code to appear on a Buick?
The code can be caused by a faulty brake pressure sensor, damaged wiring or connectors in the circuit, a malfunctioning ABS control module, or issues with the vehicle's power supply.
4. Can I drive my Buick with the C1220 code active?
While the vehicle may still be drivable, the ABS system may be disabled, increasing the risk of wheel lockup during hard braking. It’s best to address the issue promptly.
5. How is the C1220 code diagnosed on a Buick?
A technician will use a scan tool to read the code, inspect the brake pressure sensor and its wiring, measure circuit voltage, and test the ABS module to pinpoint the problem.
6. How do I fix the C1220 code on a Buick?
Repairs may include replacing a faulty brake pressure sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ABS control module.
7. What tools are needed to troubleshoot the C1220 code on a Buick?
You’ll need an OBDII scan tool, a digital multimeter to check voltage and continuity, and possibly manufacturer-specific diagnostic tools for the ABS system.
8. Can a low battery cause the C1220 code on a Buick?
Yes, a weak or failing battery or charging system can cause electrical issues, including triggering the C1220 code.
9. How much does it cost to fix the C1220 code on a Buick?
The cost depends on the root cause. Replacing a brake pressure sensor typically costs $150–$300, while ABS module repairs or replacements can cost $500–$1,000 or more.
10. Will clearing the C1220 code solve the problem?
Clearing the code without addressing the underlying issue is only a temporary fix. The code will likely return if the root cause isn’t resolved.
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