C1220 2016 GMC Sierra Code - Brake Pressure Sensor Supply Voltage Circuit High
Quick Answer
The C1220 diagnostic trouble code (DTC) for the 2016 GMC Sierra indicates a fault in the brake pressure sensor supply voltage circuit, specifically that the voltage is higher than expected. Common causes include Faulty Brake Pressure Sensor: The sensor itself may be malfunctioning, leading to incorrect voltage readings, Wiring Issues: Damaged or frayed wiring in the brake pressure sensor circuit can cause high voltage readings, Corroded Connectors: Corrosion at the connectors can lead to poor electrical connections, resulting in erroneous voltage signals. 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 2016 GMC Sierra indicates Brake Pressure Sensor Supply Voltage Circuit High.
- Common causes
- Common causes include Faulty Brake Pressure Sensor: The sensor itself may be malfunctioning, leading to incorrect voltage readings, Wiring Issues: Damaged or frayed wiring in the brake pressure sensor circuit can cause high voltage readings, Corroded Connectors: Corrosion at the connectors can lead to poor electrical connections, resulting in erroneous voltage signals.
- 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 C1220 2016 GMC Sierra Description
The C1220 diagnostic trouble code (DTC) for the 2016 GMC Sierra indicates a fault in the brake pressure sensor supply voltage circuit, specifically that the voltage is higher than expected. This sensor plays a critical role in the vehicle's braking system by monitoring the hydraulic pressure in the brake lines. When the brake pedal is pressed, the brake pressure sensor sends signals to the vehicle's electronic control unit (ECU) to adjust the braking force applied to the wheels.
Common Causes of C1220 2016 GMC Sierra
- Faulty Brake Pressure Sensor: The sensor itself may be malfunctioning, leading to incorrect voltage readings.
- Wiring Issues: Damaged or frayed wiring in the brake pressure sensor circuit can cause high voltage readings.
- Corroded Connectors: Corrosion at the connectors can lead to poor electrical connections, resulting in erroneous voltage signals.
- Short Circuit: A short circuit in the wiring harness can cause excessive voltage to be sent to the brake pressure sensor.
- ECU Malfunction: A failure in the vehicle's electronic control unit may incorrectly interpret signals from the brake pressure sensor.
Symptoms of C1220 2016 GMC Sierra
- Illuminated Warning Lights: The ABS warning light or brake warning light may be illuminated on the dashboard.
- Erratic Brake Performance: Drivers may notice inconsistent braking behavior, such as the brakes feeling spongy or overly sensitive.
- Increased Stopping Distance: The vehicle may take longer to stop than usual, indicating potential brake system issues.
- ABS Malfunction: The anti-lock braking system may not engage properly, especially during hard braking or slippery conditions.
- Diagnostic Trouble Code (DTC) Readings: The presence of the C1220 code when scanned with an OBD-II scanner.
How to Fix C1220 2016 GMC Sierra
- Visual Inspection: Begin with a thorough visual inspection of the brake pressure sensor, wiring, and connectors for any signs of damage, corrosion, or wear.
- Test the Brake Pressure Sensor: Use a multimeter to check the voltage output of the brake pressure sensor to determine if it is functioning within the manufacturer’s specifications.
- Repair or Replace Wiring: If any damaged wiring or corroded connectors are found, repair or replace them as necessary to ensure proper electrical connectivity.
- Replace the Brake Pressure Sensor: If the sensor is determined to be faulty, replace it with a new, OEM-quality part to ensure reliability.
- Clear Codes and Test Drive: After repairs, clear the DTCs using an OBD-II scanner and perform a test drive to ensure that the issue has been resolved and that the ABS system functions correctly.
Cost to Fix C1220 2016 GMC Sierra
** The typical repair costs for addressing the C1220 code can vary widely based on the specific repairs needed. On average, the cost for parts and labor may range from $150 to $600. The brake pressure sensor itself may cost between $50 and $150, while labor costs can range from $80 to $150 per hour, depending on the shop's location and reputation. In metropolitan areas or at dealerships, labor rates may be higher, while independent shops may offer more competitive pricing. It is advisable to check local rates and obtain multiple quotes for a more precise estimate. Additionally, if further diagnostics are required, that may add to the overall cost.
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Frequently Asked Questions about C1220 2016 GMC Sierra Code
What does the OBDII code C1220 mean on a 2016 GMC Sierra?
The C1220 code indicates a fault in the Brake Pressure Sensor Supply Voltage Circuit, specifically a high voltage issue.
What are the common symptoms of code C1220 in a 2016 GMC Sierra?
Symptoms may include an illuminated ABS warning light, reduced braking performance, and loss of ABS functionality.
What causes the C1220 code to appear?
Common causes include a faulty brake pressure sensor, damaged wiring or connectors, or a malfunctioning ABS module.
Can I drive my 2016 GMC Sierra with the C1220 code active?
Driving is possible, but it’s not recommended as the ABS system may not function correctly, increasing the risk of skidding during hard braking.
How do I diagnose the C1220 code on my GMC Sierra?
Start by inspecting the brake pressure sensor, connectors, and wiring for damage, followed by scanning live data from the ABS module using a diagnostic tool.
What tools are needed to repair the C1220 code?
You’ll typically need a multimeter, an OBDII scanner with ABS capabilities, and possibly replacement components like a brake pressure sensor.
How much does it cost to fix the C1220 code on a 2016 GMC Sierra?
Repair costs vary but may range from $150 to $500 depending on whether the issue involves sensor replacement or wiring repairs.
Can a weak battery cause the C1220 code?
While unlikely, a weak battery or charging system issue could potentially affect the ABS module’s electrical performance.
Do I need to reprogram anything after fixing the C1220 code?
In most cases, no reprogramming is needed, but you may need to clear the code with a scanner and perform an ABS system recalibration if required.
How can I prevent the C1220 code from recurring?
Regularly inspect and maintain the ABS wiring and sensors, and address any electrical issues in the braking system promptly.
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