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Vehicle engine and/or automatic transmission

Code: P0572 - The brake switch "A" (which detects when you press the brake pedal) is showing a low electrical signal, which may affect brake light or cruise control operation.

Let me break down what p0572 really means from a technician’s point of view. When your car throws this code, it’s telling you that the computer’s seeing a low voltage signal coming out of the brake switch circuit-specifically, what’s labeled as ‘Circuit A’. Now, that brake switch is a simple device bolted up above your brake pedal, but don’t underestimate its importance. Its job is to let the computer know exactly when you’re stepping on the brakes. That signal goes a long way: it triggers your brake lights, tells cruise control to disengage, kicks in the anti-lock brake system, and even allows you to shift out of park. If the computer senses anything off-like not enough voltage coming from that switch-it sets this code. In short, when you see p0572, your car’s basically waving a flag and saying, 'Hey, I’m not getting the brake pedal info I need!'

Causes and obd code P0572

From my time under the dash and poring over wiring diagrams, I can tell you the usual suspects for a P0572 code are:

The brake switch itself biting the dust. Honestly, that’s what I see most in the shop-these switches get worked hard and just wear out.
Wiring headaches, like a pinched, frayed, or flat-out broken wire in the brake switch circuit. Moisture can sneak under the dash and corrode connectors, or maybe a connector just wiggles loose over the years.
On the rare occasion, the powertrain control module (PCM) could be the root of the problem, but I’ll be honest-that’s not where you want to start hunting. Focus on the basics first.

In most cases, you’re looking at a switch or wiring issue, so that’s where I’d point you to begin your checks.

Symptoms of P0572 trouble code

When p0572 pops up, there are a few red flags you’ll spot pretty quick:

Your brake lights might not turn on when you tap the pedal. That’s a big one-without brake lights, drivers behind you have no clue you’re slowing down. Dangerous stuff.
Cruise control acting up-either refusing to set, or maybe it disengages out of the blue. That’s a telltale sign the computer isn’t hearing from the brake switch.

Another headache you might run into: trouble shifting out of park. Many vehicles tie the brake switch into the shift interlock, so if the switch isn’t working right, you could be stuck. If you’re seeing any of these, don’t sit on it-get it looked at fast.

Diagnosis process for obd2 code P0572

Whenever a customer brings me a car with a dtc p0572 code, here’s my go-to checklist:

Start with the brake lights. Have someone stand behind the vehicle as you press the pedal-no lights? You’re already close to the cause.
Take a look at the brake switch itself. You’ll find it mounted above the brake pedal. Is it loose, cracked, or unplugged? Sometimes, all it takes is a connector that’s rattled free over time.
Next up, the wiring. Inspect for damage-anything pinched, chewed, or corroded. Water leaks under the dash can really mess things up, so keep an eye out for any signs of moisture.
If everything looks normal, I pull out the multimeter and check voltage at the switch and connector. What you want to see is the right voltage when the pedal’s down-if it’s low, that matches the code.
If the switch and wires pass all the tests, only then do I consider the PCM as a possible cause. But honestly, that’s pretty rare in my experience.

Here’s a pro-tip from the garage: always check the brake light fuse before chasing more complicated problems. Sometimes, the easiest fix is staring you right in the face.

Common Mistakes with dtc P0572

Over the years, I’ve seen folks trip up on this code in a few predictable ways:

Jumping straight to replacing the brake switch without checking if there’s an issue with the wiring or connectors. If a wire’s broken or a connector’s rotten, a new switch won’t do a thing.
Forgetting to check the fuse. A blown fuse can cause all the same symptoms and throw the same code, so don’t skip this step.
Guessing instead of verifying with a multimeter. Trust me, testing saves time and headaches. Don’t just throw parts at it-get the facts first.

My advice? Stay methodical. Rule out the basics before you start swapping out components.

Seriousness of P0572 code issues

Don’t brush this one off. If your brake lights aren’t working, you’re basically invisible to the drivers behind you when you slow down-nothing good comes from that. And if your cruise control won’t disengage like it should, that’s just asking for trouble on the highway. You could also end up stuck in park, or in rare situations, cause damage to the PCM or other electrical parts if a short is present. Ignoring p0572 isn’t just risky-it’s downright dangerous. Take care of it as soon as possible.

Repair steps for P0572 engine code

When I’m fixing a dtc p0572 chevrolet or any brand, here’s my usual process:

Swap out the brake switch if it’s bad. Nine times out of ten, this is a quick, straightforward job.
Patch up or replace any sketchy wiring or connectors you find. Sometimes, all you need is to clean a corroded connector and you’re back in business.
If the fuse is blown, replace it-but make sure to figure out what caused it to blow in the first place, or you’ll be right back where you started.
In those rare situations where the PCM is to blame, you might need to reprogram or replace it-but don’t jump to this before checking everything else.

Once the repair’s done, I always clear the code and double-check everything: brake lights, cruise control, and shifting out of park. You want to be 100% sure the fix stuck.

Conclusion

Here’s the bottom line: p0572 means your car’s not getting the right message from the brake pedal, and that can knock out your brake lights and cruise control in one shot. It’s a problem you shouldn’t ignore, because it’s a real safety hazard. From my years in the shop, I can tell you-start with a simple brake light and switch inspection. Don’t put this off. Get it checked out and fixed pronto, for your safety and everyone else out on the road.

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