P0572
UniversalP0572 indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the circuit for brake switch 'A'. This switch typically signals the PCM when the brake pedal is depressed, often to disengage cruise control and activate brake lights.
Medium SeverityThe P0572 code means your vehicle's computer has registered a low voltage signal from the brake switch circuit associated with cruise control operation. This issue can lead to problems with cruise control functionality and potentially affect the proper operation of your vehicle's brake lights.
⚠️ Before You Begin (Safety First)
Always disconnect the battery before working on electrical components. Ensure the vehicle is parked on a level surface with the parking brake fully engaged. A malfunctioning brake switch can cause your brake lights to fail, significantly increasing the risk of a rear-end collision. Address this issue promptly.
Common Symptoms
- Check Engine Light illuminated
- Cruise control not engaging or disengaging properly
- Brake lights not illuminating when pedal is pressed
- Brake lights staying on constantly
- Difficulty shifting out of park (in some automatic transmission vehicles)
Common Causes
- Faulty or misadjusted brake light switch
- Corroded, loose, or damaged wiring/connections to the brake switch
- Blown fuse in the brake switch circuit
- Open or short circuit within the wiring harness
- Less commonly, a faulty Powertrain Control Module (PCM)
Frequently reported on: Honda Civic (2006-2011), Toyota Camry (2007-2011), Ford F-150 (2004-2008), Nissan Altima (2007-2012), Hyundai Sonata (2006-2010)
Diagnostic Steps
- Locate the brake switch, typically mounted on the brake pedal arm under the dashboard.
- Visually inspect the switch and its electrical connector for any signs of damage, corrosion, or looseness.
- Check the fuse associated with the brake lights in your vehicle's fuse box. Replace if blown.
- If possible, test the brake switch's functionality using a multimeter (refer to your vehicle's repair manual for specific testing procedures and values).
- If the switch is determined to be faulty, disconnect the battery, remove the old switch, and install a new one, ensuring it is properly adjusted according to manufacturer specifications.
- Clear the P0572 code using an OBD-II scanner and test the vehicle's brake lights and cruise control functionality.
👨🔧 When to Call a Professional
If you have replaced the brake switch and checked all related wiring and fuses, but the code persists, or if you are experiencing intermittent brake light functionality, it's time to consult a professional mechanic. There might be a deeper electrical issue or a problem with the PCM.
Commonly Asked Questions
Can I continue driving with a P0572 code?
It is not recommended, especially if your brake lights are not working or cruise control is malfunctioning. This can create unsafe driving conditions and increase the risk of an accident.
Where is the brake switch located?
The brake switch is usually found mounted on the brake pedal arm, just above the pedal itself, under the dashboard.
Do I need special tools to replace a brake switch?
Most brake switch replacements require only basic hand tools, such as a screwdriver or a small wrench. A multimeter can be useful for diagnosing the switch.
Could a blown fuse cause the P0572 code?
Yes, a blown fuse in the brake light or brake switch circuit can interrupt the electrical flow, causing a low voltage condition and triggering the P0572 code. Always check fuses first.
How do I know if the new brake switch is adjusted correctly?
After installation, verify that your brake lights illuminate immediately when the pedal is pressed and turn off completely when released. Also, confirm that your cruise control engages and disengages as expected.