P0571 Mercury Code - Brake Switch 'A' Circuit
Quick Answer
The P0571 diagnostic trouble code (DTC) for Mercury vehicles indicates a problem with the Brake Switch 'A' Circuit. Common causes include Faulty brake light switch, Damaged wiring or connectors in the brake light circuit, Malfunctioning PCM. 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
- P0571 Mercury indicates Brake Switch 'A' Circuit.
- Common causes
- Common causes include Faulty brake light switch, Damaged wiring or connectors in the brake light circuit, Malfunctioning PCM.
- 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 P0571 Mercury Description
The P0571 diagnostic trouble code (DTC) for Mercury vehicles indicates a problem with the Brake Switch 'A' Circuit. This code is typically triggered when the powertrain control module (PCM) detects an electrical fault within the brake light switch circuit. The brake light switch is a crucial component that allows the vehicle to know when the brake pedal is depressed, signaling the brake lights to illuminate and potentially activating other systems like cruise control or the vehicle's transmission shift interlock.
Common Causes of P0571 Mercury
- Faulty brake light switch.
- Damaged wiring or connectors in the brake light circuit.
- Malfunctioning PCM.
- Corrosion or poor connections in the brake light circuit.
- Physical damage to the brake light switch or pedal assembly.
Symptoms of P0571 Mercury
- Brake lights not illuminating when the brake pedal is pressed.
- Inability to shift the transmission out of park.
- Cruise control not working properly.
- Illumination of the check engine light on the dashboard.
How to Fix P0571 Mercury
- Begin by locating the brake light switch, typically located near the brake pedal assembly.
- Inspect the wiring and connectors for any signs of damage or corrosion. Repair or replace as necessary.
- Test the brake light switch using a multimeter to ensure it is functioning correctly. Replace if faulty.
- Clear the DTC with a scan tool and test the vehicle to ensure the issue has been resolved.
- If the problem persists, further diagnostics may be necessary to identify any underlying issues with the PCM or other related components.
Cost to Fix P0571 Mercury
The cost of repairing a P0571 code can vary depending on the specific cause of the issue. In general, replacing a faulty brake light switch can range from $50 to $150, including parts and labor. However, if the problem is related to wiring repairs or PCM issues, the cost may increase significantly. Additional diagnostic time and labor rates at auto repair shops can also impact the overall cost. It's recommended to consult with a professional mechanic to get an accurate estimate for your specific vehicle.
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