Let me break down P0571 for you, straight from the bay: this code means your car’s brake switch circuit-specifically, the “A” part of it-has an issue. Now, this little circuit is busier than you might think. It’s the one telling your ride’s computer when you hit the brake pedal. In turn, it flips on your brake lights, lets you shift out of park, and makes sure cruise control shuts off the moment your foot touches the brakes. When the computer (the PCM) senses something’s not right-like the signal’s weak, missing, or just plain wrong-it’ll throw this code. Sometimes it’s a quirky wire, other times it’s a tired-out switch, and in rare cases, you’re looking at a deeper computer glitch. Different manufacturers might have their own twists, but at the core, the story’s always the same: your car isn’t hearing from the brake pedal switch like it should.
DTC P0571
5433
5 minutes of readingP0571 code Causes
From experience, the most common culprit for a p0571 code is a faulty brake light or cruise control switch. I see this a lot in the shop-those switches get used every time you touch the brake pedal, so they do wear out. Next up, wiring issues are a frequent offender: things like frayed wires, loose connectors, or corrosion can break the signal. On rare occasions, the problem can be with the car’s computer (the PCM), but that’s not where I’d start. Here’s what I usually find:
- Defective brake light/cruise control switch
- Broken, damaged, or corroded wiring or connectors in the switch circuit
- PCM (powertrain control module) malfunction (uncommon)
Obd code P0571 Symptoms
When this code pops up, you’ll probably notice a few things. The check engine light will almost always be on. Most folks also find that the cruise control stops working, or acts up-sometimes it won’t set, or it might disengage unexpectedly. Another big one: your brake lights might not come on when you press the pedal, which is a real safety hazard. In some cases, the car might not let you shift out of park, or the cruise control might behave erratically. If you spot any of these, don’t ignore them-they’re warning signs that something important isn’t working right.
P0571 Diagnosis
Here’s how I tackle a dtc p0571 code, step by step. First, I always start simple: check if the brake lights work when you press the pedal. If they don’t, that’s a big clue. Next, I’ll look at the brake light switch itself-usually found above the brake pedal. Make sure it’s firmly attached and the wiring isn’t loose or damaged. It’s a good idea to have someone help: one person presses the brake while the other checks the lights and listens for clicks from the switch. If you have a scan tool, you can monitor the brake switch input while pressing the pedal to see if the signal is reaching the computer. Don’t forget to inspect the wiring and connectors for any signs of corrosion, fraying, or loose pins. If everything looks good but the problem persists, I’ll check for voltage at the switch and continuity through the circuit. Only after ruling out the basics would I consider a PCM issue, and that’s pretty rare. Always consult your vehicle’s service manual for the exact wire colors and pin locations-manufacturers sometimes do things a little differently.
Obd2 code P0571 Common Mistakes
One thing I see all too often is folks replacing the brake switch right away without checking the wiring or connectors. That’s a surefire way to waste money if the real problem is a broken wire or a loose plug. Another common mistake is not checking the fuse related to the brake lights-sometimes it’s just a blown fuse. Skipping the basics and jumping straight to expensive parts or assuming it’s a computer problem can lead you down the wrong path. Always start with the simple stuff first.
P0571 engine code Seriousness
This isn’t something you want to put off. If your brake lights aren’t working, other drivers won’t know when you’re stopping-and that’s a serious hazard. Plus, if the cruise control isn’t disengaging properly, it could keep the car accelerating when you’re trying to slow down. Things can go south quickly if this is ignored. Over time, ignoring the issue can also affect the shift interlock system, making it hard or impossible to get the car out of park. In rare cases, persistent electrical faults can cause damage to the PCM or related wiring. Bottom line: don’t drive around with this code active-it’s just not worth the risk.
DTC P0571 Repair
Most often, the fix is replacing the faulty brake light or cruise control switch. That’s usually a straightforward job and doesn’t take long. If the switch is fine, I recommend checking and repairing any damaged wiring or connectors you find. Clean up any corrosion and make sure everything is plugged in tight. If a fuse is blown, replace it-but also figure out why it blew in the first place. Only after all these steps would I look at the PCM, and that’s very rare. Always clear the code after repairs and test drive the car to make sure everything’s working as it should.
Conclusion
To sum it up, P0571 means your car isn’t getting the right signal from the brake switch circuit-a part that’s vital for both safety and convenience. It’s a high-priority issue because it can knock out your brake lights and cruise control, and that’s not something to gamble with. The most reliable way to resolve it is to start with a simple check of the brake lights and switch, then work through the wiring and connectors before considering anything more complicated. Don’t delay-get this sorted out promptly for your safety and peace of mind.
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