When that annoying P1571 code shows up on your dashboard, it can be frustrating, but don’t worry—fixing it can be easy if you know where to start.
First, check the brake pedal switch for any damage or if it’s out of place. Use a multimeter to see if it’s working properly and look for any frayed or rusty wires. Make sure all the connectors are plugged in tightly.
If the problem is still there, take a look at the throttle body to see if it’s dirty.
Want to know what to do next and how to keep your car safe? Let’s dive into the details.
Key Takeaways
- Change the faulty brake pedal switch to make sure it works right and keeps the car safe.
- Look at and clean the throttle body to get rid of dirt and make sure the throttle responds well.
- Check the wires and connectors for any damage, rust, or breaks, and fix them if needed.
- Use an OBD-II scanner to find and clear error codes, then take the car for a test drive.
Understanding the P1571 Code
The P1571 code means there’s a problem with the brake pedal switch, which is crucial for detecting when you press the brakes. If this error code shows up, your vehicle mightn’t correctly recognize when you’re braking.
This issue can mess up both the braking and throttle systems, causing safety and driving problems. The code is often related to the electronic throttle control (ETC) system, which needs accurate brake signals to work properly.
If these systems aren’t communicating right, you could have unresponsive brakes or erratic throttle behavior. Fixing this issue quickly is important to keep your vehicle running smoothly and ensure your safety on the road.
Common Symptoms
If your car has the P1571 code, it means there might be issues with the brake pedal switch and possibly the throttle control system.
You could notice problems like the brake lights not coming on when you press the pedal. You might also have trouble with the throttle, such as reduced engine power, uneven acceleration, or the throttle not responding at all.
The check engine light will probably turn on to warn you about the issue. These problems can make your car unsafe and hard to drive, so it’s important to fix them quickly.
Watch out for any strange engine behavior, as it could be a sign of issues with the brake pedal switch and throttle control system.
Typical Causes
Common reasons for the P1571 code include a bad brake pedal switch, problems with the throttle position sensor (TPS) or the accelerator pedal position sensor (APPS), wiring issues, environmental factors affecting electrical parts, and computer system glitches.
A malfunctioning brake switch often means the car can’t properly detect when you’re braking, which can trigger the code.
Throttle control problems happen when the TPS or APPS fails, affecting how the car speeds up or slows down.
Wiring issues, like corrosion or damage, can mess up the circuit.
Environmental factors such as moisture and debris can harm electrical components.
Lastly, computer system glitches, including issues with the ECU, can send wrong signals, causing the P1571 code to pop up.
Affected Car Models
Certain car models, like the Acura TL, Volkswagen Passat, Lexus LS400 hybrid, Toyota Camry, and Honda Accord, often have issues with the P1571 code.
For Acura TL, the problem usually comes from the immobilizer system.
In Volkswagen Passat, it’s often the brake pedal switch power supply.
Lexus LS400 hybrids face this issue because of computer system problems.
For Toyota Camry, specific models have this error, and for Honda Accord, it’s often due to brake switch failures.
Knowing these common issues for each car can help fix the problem quickly, keeping the car safe and running well.
Diagnostic Tools
To figure out what’s causing the P1571 code in these car models, start by using an OBD-II scanner. Plug the scanner into your car’s diagnostic port to read the error codes.
The P1571 code means there’s a problem with the brake switch circuit. The OBD-II scanner helps you find related issues quickly and might show more codes that could affect your diagnosis.
Once you see the P1571 code, check if the brake switch is working properly. This part is crucial for the braking system to communicate with the car’s electronic control unit (ECU).
This method ensures you fix the main problem efficiently.
Inspecting the Brake Pedal Switch
When checking the brake pedal switch, start by finding it near the brake pedal arm. It’s usually attached to a bracket or built into the pedal assembly. This part is important for making sure your brake lights work right.
Follow these steps to test the switch:
- Look it Over: See if the switch looks damaged, worn out, or out of place.
- Test Electrically: Use a multimeter to check if the switch opens and closes as it should by measuring resistance.
Checking the Throttle Body
Checking the Throttle Body
When diagnosing the P1571 code, it’s important to check the throttle body for any damage, dirt, or carbon buildup that might affect its performance.
Start by taking off the throttle body and looking at it closely. If you see any buildup, clean it using a throttle body cleaner to ensure smooth airflow.
After cleaning, put the throttle body back in place and use a diagnostic tool to reset the electronic throttle control (ETC) settings. This ensures the throttle responds correctly and helps prevent future problems.
Proper throttle maintenance not only fixes the P1571 code but also boosts overall engine performance, making driving safer and more efficient.
Wiring and Connectors
After making sure the throttle body is clean, it’s important to check the wiring and connectors for any wear, corrosion, or damage that could mess with the brake and throttle systems.
Start by carefully looking over all the wires for any fraying or breaks. Different types of connectors may need special attention to make sure they’re making good contact and working properly.
- Look at each wire and connector closely for any signs of wear or rust.
- Use a multimeter to check that the wires are working properly and there are no breaks or shorts.
Evaluating the Computer System
To check the computer system, start by using diagnostic tools to see if there are any communication problems between the ECU and the brake pedal switch.
Connect an OBD-II scanner to the vehicle and look at the computer diagnostics. Check for any error codes related to the ECU or communication issues.
Make sure the ECU is properly receiving and sending signals to the brake pedal switch. If you find any problems, see if the ECU needs updates or reprogramming.
Write down any unusual performance issues. Clear the error codes and take the vehicle for a test drive to see if the P1571 code comes back.
If the issue persists, it might mean there are more serious problems with the ECU, and you should seek professional help.
Accurate diagnostics are key for effective repairs.
Repair Solutions
Fixing the root causes of the P1571 code involves several solutions, ranging from replacing the brake pedal switch to updating the car’s computer. Here’s what you can do:
- Brake Switch Replacement: Swap out the faulty brake switch to ensure your brakes are detected properly.
- Throttle Sensor Repair: Fix or replace the sensors that check the throttle position or accelerator pedal.
These steps can help clear the P1571 code, ensuring your car runs safely and efficiently.
More OBD-II Codes
Frequently Asked Questions
How Long Can I Drive With a P1571 Code Before Fixing It?
You shouldn’t drive for long with a P1571 code. This code can cause problems like reduced engine power and unresponsive brakes, which can make driving unsafe. Fix it right away to avoid accidents and make sure your car runs properly.
Is the P1571 Code Covered Under Vehicle Warranty?
Check your warranty to see if it includes vehicle diagnostics. Depending on your warranty terms, the P1571 code might be covered, especially if it involves a manufacturer defect or a critical electronic system failure.
Can a P1571 Code Cause an Emissions Test Failure?
Did you know that 30% of emissions test failures come from engine problems? Symptoms of a P1571 code, like reduced engine power, can lead to higher emissions. Because of strict emissions rules, not fixing a P1571 code can make your car fail an emissions test.
Are There Any Temporary Fixes for the P1571 Code?
To temporarily fix the P1571 code, you can try cleaning the brake pedal switch and checking for any loose connections. These steps might help for a short time, but you should fix the main problem to ensure your car runs safely and reliably.
How Much Does It Cost to Professionally Diagnose a P1571 Code?
It usually costs between $100 and $150 to have a professional figure out what’s causing the P1571 code. Fixing the problem can cost anywhere from $100 for simple wiring repairs to several hundred dollars if you need to replace a sensor.
Conclusion
You’ve got a plan to fix that P1571 code. By checking the brake pedal switch, examining the wiring, and cleaning the throttle body, you’re dealing with key parts of your car.
Don’t let a small problem turn into a bigger one. Stay alert, use your diagnostic tools carefully, and make sure your ECU software is current.
Think of your car like a team—every part needs to work well for a smooth ride.
