C1220 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra?
- 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 2017 GMC Sierra?
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 2017 GMC Sierra 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 2017 GMC Sierra Code
1. What does the OBDII code C1220 mean on a 2017 GMC Sierra?
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 the symptoms of the C1220 code on a 2017 GMC Sierra?
Common symptoms include an illuminated ABS warning light, traction control issues, and potential loss of ABS functionality.
3. What causes the C1220 code on a 2017 GMC Sierra?
Possible causes include a faulty brake pressure sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning ABS control module.
4. Can I drive my 2017 GMC Sierra with the C1220 code?
While the vehicle may still be drivable, the ABS and traction control systems may not function properly, increasing the risk of losing control in slippery conditions.
5. How do I diagnose the C1220 code on my 2017 GMC Sierra?
Check the brake pressure sensor and its wiring for damage or corrosion, use a multimeter to test the circuit voltage, and scan the ABS module for related codes.
6. How is the C1220 code fixed on a 2017 GMC Sierra?
Repairs may involve replacing the brake pressure sensor, repairing or replacing damaged wiring, or reprogramming or replacing the ABS control module if necessary.
7. How much does it cost to fix the C1220 code on a 2017 GMC Sierra?
The cost varies depending on the issue, but replacing the brake pressure sensor typically costs $100-$300, while ABS module repairs can be more expensive.
8. Can a low battery cause the C1220 code on a 2017 GMC Sierra?
A low or weak battery can sometimes cause electrical issues, but C1220 is more commonly caused by a specific fault in the brake pressure sensor circuit.
9. How do I prevent the C1220 code from occurring again?
Regularly inspect the brake pressure sensor and its wiring for damage, ensure connectors are secure and clean, and address any ABS system issues promptly.
10. Is the C1220 code covered under warranty for a 2017 GMC Sierra?
It depends on your vehicle’s warranty coverage and mileage; consult your GMC dealership to determine if the repair is covered.
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