C1220 Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What does the OBDII code C1220 mean on a Cadillac?
The C1220 code indicates an issue with the brake pressure sensor supply voltage circuit being too high, which can affect the brake system's performance.
2. What are the common symptoms of code C1220 on a Cadillac?
Symptoms may include ABS or brake warning lights on the dashboard, reduced braking performance, or a lack of ABS functionality.
3. What causes the C1220 code to appear on a Cadillac?
Common causes include a faulty brake pressure sensor, damaged wiring or connections in the sensor circuit, or a malfunctioning ABS control module.
4. Can I drive my Cadillac with the C1220 code?
It is not recommended to drive with this code, as it may compromise the ABS system and overall brake performance, posing a safety risk.
5. How do I diagnose the C1220 code on a Cadillac?
Start by inspecting the brake pressure sensor wiring and connectors for damage or corrosion, then use a multimeter to test the voltage and continuity of the circuit.
6. How do I fix the C1220 code on a Cadillac?
Repairs may include replacing a faulty brake pressure sensor, repairing damaged wiring, or reprogramming or replacing the ABS control module if necessary.
7. What tools are needed to diagnose and repair the C1220 code?
You will need an OBDII scanner, a multimeter, and basic automotive tools to inspect and repair wiring or replace components.
8. How much does it cost to fix the C1220 code on a Cadillac?
Costs vary depending on the specific issue but typically range from $100 to $400 for parts and labor if professional repairs are needed.
9. Can a low battery voltage cause the C1220 code on a Cadillac?
While unlikely, electrical issues such as low battery voltage can sometimes contribute to sensor and circuit malfunctions.
10. Do I need to clear the C1220 code after repairs?
Yes, after completing repairs, use an OBDII scanner to clear the code and confirm that it does not return during a test drive.
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