C1220 Buick Code - Brake Pressure Sensor Supply Voltage Circuit High
Quick Answer
The C1220 Buick code indicates that there is a high voltage condition in the brake pressure sensor supply circuit. Common causes include Faulty brake pressure sensor, Short circuit or open circuit in the wiring harness, Corrosion or poor connection in the sensor circuit. 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 brake pressure sensor, Short circuit or open circuit in the wiring harness, Corrosion or poor connection in the sensor circuit.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code C1220 Buick Description
The C1220 Buick code indicates that there is a high voltage condition in the brake pressure sensor supply circuit. The brake pressure sensor is a crucial component of the vehicle's anti-lock braking system (ABS) as it monitors the hydraulic pressure in the brake system. The sensor sends this information to the ABS control module, which uses it to regulate brake pressure and prevent wheel lock-up during sudden braking or slippery road conditions.
Common Causes of C1220 Buick
- Faulty brake pressure sensor
- Short circuit or open circuit in the wiring harness
- Corrosion or poor connection in the sensor circuit
- Issues with the ABS control module
- Electrical problems in the vehicle's system
Symptoms of C1220 Buick
- Illumination of the ABS warning light on the dashboard
- Increased stopping distances during braking
- ABS system engaging unexpectedly or not engaging at all
- Loss of stability or traction control during braking
- Unusual noises coming from the ABS system
How to Fix C1220 Buick
- Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the trouble codes and confirm the issue.
- Inspect the brake pressure sensor and its wiring harness for any visible damage, corrosion, or loose connections. Replace or repair as necessary.
- Test the voltage output of the brake pressure sensor using a multimeter to determine if it is within the specified range. Replace the sensor if it is faulty.
- Check the ABS control module for any signs of malfunction or damage. Replace the module if necessary.
- Clear the trouble codes from the ABS system using the diagnostic scanner and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix C1220 Buick
The cost of repairing a C1220 Buick code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnostic time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate based on your location and vehicle model.
Need more information about the C1220 Buick code?
Need more information on how to fix the C1220 Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1220 Buick code diagnosed by a professional: Find a repair shop in your area
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.
Discuss the causes and fixes for C1220 Buick OBDII Code
Code C1220 Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.