C1220 2018 GMC Sierra Code - Brake Pressure Sensor Supply Voltage Circuit High
Quick Answer
The C1220 diagnostic trouble code for the 2018 GMC Sierra indicates an issue with the brake pressure sensor supply voltage circuit being too high. Common causes include Faulty brake pressure sensor, Issues with the wiring or connectors in the brake pressure sensor circuit, Corrosion or damage to the sensor or its components. 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 GMC Sierra indicates Brake Pressure Sensor Supply Voltage Circuit High.
- Common causes
- Common causes include Faulty brake pressure sensor, Issues with the wiring or connectors in the brake pressure sensor circuit, Corrosion or damage to the sensor or its components.
- 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 2018 GMC Sierra Description
The C1220 diagnostic trouble code for the 2018 GMC Sierra indicates an issue with the brake pressure sensor supply voltage circuit being too high. The brake pressure sensor is a crucial component in the vehicle's braking system, responsible for monitoring the hydraulic pressure within the brake system. When the sensor detects that the supply voltage is higher than the specified range, it triggers the C1220 code.
Common Causes of C1220 2018 GMC Sierra
- Faulty brake pressure sensor
- Issues with the wiring or connectors in the brake pressure sensor circuit
- Corrosion or damage to the sensor or its components
- Electrical issues such as a short circuit or high voltage in the circuit
Symptoms of C1220 2018 GMC Sierra
- Illumination of the ABS warning light on the dashboard
- Inconsistent or unresponsive brake pedal feel
- Increased stopping distances
- ABS system malfunction or activation under normal braking conditions
How to Fix C1220 2018 GMC Sierra
- 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 supply voltage using a multimeter to determine if it is within the specified range.
- If the supply voltage is too high, check the wiring and connectors for any loose connections or shorts that could be causing the issue.
- Replace the brake pressure sensor if it is determined to be faulty or damaged.
- Clear the diagnostic trouble codes from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix C1220 2018 GMC Sierra
The cost of repairing a C1220 code related to the brake pressure sensor supply voltage circuit high can vary depending on the specific cause of the issue and the labor rates of the repair shop. In general, the cost of replacing a faulty brake pressure sensor can range from $150 to $300, including parts and labor. Additional costs may apply if there are wiring or connector issues that need to be addressed. It is advisable to consult with a trusted auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle.
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Frequently Asked Questions about C1220 2018 GMC Sierra Code
What does the OBDII code C1220 mean for a 2018 GMC Sierra?
C1220 indicates a problem with the brake pressure sensor supply voltage circuit, specifically a high voltage condition detected by the system.
What are common symptoms of the C1220 code in a 2018 GMC Sierra?
Symptoms may include illuminated ABS or traction control warning lights, reduced braking performance, or inconsistent brake pedal feel.
What causes the C1220 code to appear in a 2018 GMC Sierra?
Causes can include a faulty brake pressure sensor, damaged wiring or connectors in the sensor circuit, or issues with the ABS control module.
Can C1220 affect the safety of my 2018 GMC Sierra?
Yes, the code can impact braking system performance and stability control, potentially compromising vehicle safety.
How can I diagnose the C1220 code in my 2018 GMC Sierra?
Start by inspecting the brake pressure sensor, wiring, and connectors for damage. Use a multimeter to check for proper voltage and continuity.
Can I continue driving my 2018 GMC Sierra with the C1220 code?
It is not recommended to drive with this code active because it may affect braking and stability control, increasing the risk of an accident.
How do I fix the C1220 code on a 2018 GMC Sierra?
Repairs may involve replacing the brake pressure sensor, repairing damaged wiring, or reprogramming or replacing the ABS control module.
How much does it cost to repair the C1220 code in a 2018 GMC Sierra?
Repair costs vary, but replacing a brake pressure sensor typically costs $100-$300, while ABS module repairs can cost $500-$1,000.
Can a weak battery cause the C1220 code in a 2018 GMC Sierra?
Yes, a weak or failing battery can cause electrical inconsistencies that trigger this code. Ensure the battery voltage is within the recommended range.
Do I need to reset the code after fixing the issue?
Yes, after repairs, use an OBDII scanner to clear the code and confirm that the issue has been resolved.
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