The P1571 trouble code is a diagnostic trouble code (DTC) that indicates a malfunction in the brake pedal switch circuit, which is crucial for the proper functioning of the vehicle’s braking system and traction control. This code is typically associated with vehicles equipped with an Anti-lock Braking System (ABS) and Traction Control System (TCS). When the brake pedal switch fails or the circuit experiences issues, it can lead to safety concerns, such as loss of braking effectiveness or unintended acceleration. Understanding this code is vital for vehicle owners and DIY mechanics to ensure safe driving conditions.
| P1571 Code Meaning | P1571 Code Common Causes |
|---|---|
| Brake pedal switch circuit malfunction | Faulty brake pedal switch |
| Traction control torque request issue | Wiring issues in the brake pedal circuit |
| Electronic Brake and Traction Control Module (EBTCM) communication failure | Faulty EBTCM or PCM (Powertrain Control Module) |
| Immobility due to security system malfunction | Corroded or damaged connectors |
Symptoms of P1571 Code
When the P1571 code is triggered, several symptoms may manifest, affecting vehicle performance and safety:
- Check Engine Light: The most common indication of a problem.
- Loss of Traction Control: The traction control system may become disabled, leading to reduced vehicle stability during slippery conditions.
- Braking Issues: Drivers may experience delayed braking response or difficulty engaging the brakes.
- Cruise Control Malfunction: In some cases, the cruise control system may fail to operate correctly.
- Engine Stalling: The engine may start but stall shortly after due to improper throttle response.
Technical Explanation
The P1571 code primarily relates to the brake pedal switch circuit, which informs the vehicle’s computer when the brake pedal is engaged. This information is essential for various systems, including:
- Throttle Control: When the brake pedal is pressed, the throttle may be reduced to prevent acceleration.
- Traction Control Activation: The system relies on accurate signals from the brake pedal switch to manage wheel slip and maintain traction.
If there is a fault in this circuit, it can lead to incorrect readings being sent to the Powertrain Control Module (PCM), resulting in erratic behavior of these systems.
Step-by-Step Diagnosis
Diagnosing the P1571 code involves several steps to identify the root cause:
1. Retrieve Diagnostic Codes
Use an OBD-II scanner to confirm that P1571 is present. Check for any accompanying codes that might provide additional context.
2. Inspect Brake Pedal Switch
- Visual Inspection: Examine the brake pedal switch for physical damage or misalignment.
- Multimeter Test: Use a multimeter to check for continuity in the switch. It should show continuity when the pedal is depressed and none when released.
3. Check Wiring and Connectors
- Wiring Inspection: Look for frayed wires, corrosion, or loose connections in the brake pedal switch circuit.
- Connector Check: Ensure all connectors are secure and free from corrosion.
4. Evaluate EBTCM and PCM
If no issues are found with the switch and wiring:
- Module Testing: Test the Electronic Brake and Traction Control Module (EBTCM) and Powertrain Control Module (PCM) for faults using manufacturer-specific diagnostic tools.
5. Perform System Reset
After repairs, clear any stored codes and perform a test drive to see if the P1571 code returns.
Solution Methods
Once you have diagnosed the issue causing the P1571 code, follow these solutions based on your findings:
Replace Brake Pedal Switch
If testing reveals a faulty brake pedal switch:
- Disconnect battery power.
- Remove any panel obstructing access to the switch.
- Disconnect wiring harness from the old switch.
- Install a new brake pedal switch and reconnect wiring.
- Reassemble panels and reconnect battery power.
Repair Wiring Issues
If damaged wiring is found:
- Cut out damaged sections of wire.
- Strip insulation from both ends of new wire.
- Use solder or crimp connectors to join new wire with existing harness.
- Insulate connections with heat shrink tubing or electrical tape.
Replace EBTCM or PCM
If module failures are suspected:
- Consult your vehicle’s service manual for specific replacement procedures.
- Disconnect battery power before removing modules.
- Install new module following manufacturer instructions.
- Reconnect battery power and perform necessary programming if required.
Cost Estimates
The cost for repairs associated with P1571 can vary significantly based on labor rates and parts costs:
- Brake Pedal Switch Replacement: $50 – $150 (parts + labor)
- Wiring Repair: $100 – $200 depending on complexity.
- Module Replacement: $300 – $800 for EBTCM or PCM, plus labor costs which can range from $100 – $150 per hour.
Warnings and Recommendations
- Always disconnect your vehicle’s battery before working on electrical components to avoid shorts or shocks.
- If you are unsure about diagnosing or repairing electrical issues, seek professional help.
- Regular maintenance of electrical systems can prevent issues like those indicated by P1571 from arising in the first place.
Closing Paragraph
Understanding and addressing the P1571 trouble code is essential for maintaining vehicle safety and performance. By familiarizing yourself with its symptoms, diagnosis steps, potential causes, and repair methods, you can effectively tackle this issue whether you’re a seasoned DIY mechanic or a vehicle owner seeking assistance. Remember that while some repairs can be performed at home, others may require professional expertise—never hesitate to consult a certified technician when in doubt about your vehicle’s health.
Frequently Asked Questions About P1571
- What does P1571 mean?
The P1571 code indicates a malfunction in the brake pedal switch circuit that affects traction control and throttle response. - What are common symptoms of P1571?
Symptoms include check engine light illumination, loss of traction control functionality, braking issues, and possible engine stalling. - Can I drive my car with a P1571 code?
Driving with this code can be unsafe as it may affect braking performance; it’s advisable to address it promptly. - How do I fix a P1571 code?
Fixing this code often involves inspecting and possibly replacing the brake pedal switch, repairing wiring issues, or replacing faulty modules. - Is professional help needed for P1571?
If you’re not comfortable diagnosing electrical issues or if repairs require specialized knowledge, professional assistance is recommended. - What tools do I need to diagnose P1571?
A basic OBD-II scanner, multimeter for electrical testing, and standard hand tools for component replacement are typically required. - How much will it cost to repair a P1571 code?
The cost can range from $50 for simple repairs like switch replacement up to several hundred dollars for module replacements. - Can other codes accompany P1571?
Yes, it’s common for other related codes to appear alongside P1571; always check for additional DTCs during diagnosis.