C1220 GMC Code - Brake Pressure Sensor Supply Voltage Circuit High
Quick Answer
The C1220 GMC code indicates a problem with the brake pressure sensor supply voltage circuit being too high. Common causes include Faulty brake pressure sensor, Corroded or damaged wiring in the sensor circuit, Issues with the ABS module. 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 GMC indicates Brake Pressure Sensor Supply Voltage Circuit High.
- Common causes
- Common causes include Faulty brake pressure sensor, Corroded or damaged wiring in the sensor circuit, Issues with the ABS module.
- 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 GMC Description
The C1220 GMC code indicates a problem with the brake pressure sensor supply voltage circuit being too high. The brake pressure sensor is a crucial component of the vehicle's anti-lock braking system (ABS), responsible for monitoring the hydraulic pressure in the brake system. When the sensor detects that the supply voltage is too high, it can lead to issues with the ABS functionality, affecting the vehicle's braking performance and safety.
Common Causes of C1220 GMC
- Faulty brake pressure sensor
- Corroded or damaged wiring in the sensor circuit
- Issues with the ABS module
- Electrical problems such as a short circuit or high resistance in the circuit
- Water or debris intrusion affecting sensor operation
Symptoms of C1220 GMC
- Illuminated ABS warning light on the dashboard
- Increased stopping distance when applying the brakes
- ABS system engaging unexpectedly or malfunctioning
- Loss of traction control functionality
- Brake pedal feels spongy or unresponsive
How to Fix C1220 GMC
- Begin by conducting a thorough inspection of the brake pressure sensor and its wiring harness to check for any visible damage or corrosion.
- Test the sensor's voltage output using a multimeter to determine if it is within the specified range.
- If the sensor is faulty, replace it with a new, OEM-quality sensor to ensure proper functionality.
- Check and repair any damaged wiring or connections in the sensor circuit to restore proper voltage supply.
- Clear the diagnostic trouble codes from the vehicle's system using a scan tool and perform a test drive to verify that the issue has been resolved.
Cost to Fix C1220 GMC
The cost of repairing a brake pressure sensor supply voltage circuit high issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, you can expect to pay between $150 to $300 for parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to obtain quotes from local auto repair shops for a more accurate estimate.
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Information for Specific GMC Models
- C1220 2014 GMC Sierra — Brake Pressure Sensor Supply Voltage Circuit High
- C1220 2015 GMC Sierra — Brake Pressure Sensor Supply Voltage Circuit High
- C1220 2016 GMC Sierra — Brake Pressure Sensor Supply Voltage Circuit High
- C1220 2017 GMC Sierra — Brake Pressure Sensor Supply Voltage Circuit High
- C1220 2018 GMC Sierra — Brake Pressure Sensor Supply Voltage Circuit High
Frequently Asked Questions about C1220 GMC Code
1. What does the OBDII code C1220 mean on a GMC vehicle?
C1220 indicates a "Brake Pressure Sensor Supply Voltage Circuit High," meaning the brake pressure sensor is detecting a voltage higher than the expected range.
2. What are the common symptoms of code C1220 in a GMC vehicle?
Symptoms may include the ABS warning light illuminating, loss of ABS functionality, reduced braking performance, or a soft brake pedal feel.
3. What causes the C1220 code to appear in GMC vehicles?
Common causes include a faulty brake pressure sensor, damaged wiring or connectors, a malfunctioning ABS control module, or issues with the vehicle’s electrical system.
4. Can I still drive my GMC vehicle with a C1220 code?
While the vehicle may still be drivable, it is not recommended as the ABS system may not function properly, increasing the risk of reduced braking performance in emergencies.
5. How is the C1220 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the brake pressure sensor and related wiring, check for proper voltage supply, and test the ABS control module for faults.
6. Can a bad ABS control module cause a C1220 code?
Yes, a malfunctioning ABS control module can cause incorrect voltage readings and trigger the C1220 code.
7. How do you fix the C1220 code on a GMC vehicle?
Repairs may include replacing the brake pressure sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or, in some cases, replacing the ABS control module.
8. What tools are needed to troubleshoot the C1220 code?
Tools like an OBDII scanner, multimeter, and possibly a wiring diagram for the ABS system are typically required for diagnosis.
9. Can a low battery voltage cause the C1220 code on a GMC?
While unlikely, low system voltage could affect sensor readings and should be checked during the diagnostic process.
10. What should I do if the C1220 code reappears after repairs?
If the code reappears, recheck the wiring and connections, ensure the replacement parts are functioning correctly, and verify the ABS module is working properly.
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