Skip the auto shop - Our mechanics make house calls

P0571 OBD-II Trouble Code: Cruise Control/Brake Switch A Circuit Malfunction

check engine light

P0571 code definition

The P0571 code identifies a problem with the switch that deactivates the cruise control when the brake pedal is pressed.

What the P0571 code means

P0571 is the OBD-II generic code for a problem with the switch connected to the brake pedal that deactivates the cruise control system in the vehicle. If this switch is not functional, the cruise control may not operate.

What causes the P0571 code?

The brake switch code may have several causes:

What are the symptoms of the P0571 code?

The P0571 code will cause the check engine light to illuminate on the dashboard. Aside from that, symptoms may include a non-operational cruise control system. The brake pedal may not be able to deactivate the cruise control once it has been set.

How does a mechanic diagnose the P0571 code?

The P0571 code is diagnosed with an OBD-II code scanner that is capable of seeing the information coming from the engine in real-time. A qualified technician will observe when the code first appeared before clearing the code and test driving the vehicle. If the code does not immediately come back, it may just be an intermittent problem with wiring or electrical connections.

If the code does come back immediately, then further diagnosis will be necessary. The technician will use a multimeter to test the circuit for any bad signals.

Common mistakes when diagnosing the P0571 code

Since the root f the P0571 is usually an electrical problem, it is important to not overlook the little things like the fuses or the buttons on the dashboard that control the cruise control system. A problem with these components can cause the P0571 code to appear even when the brake switch is in working order.

How serious is the P0571 code?

While the P0571 code is not particularly serious all by itself, it may appear alongside other codes in the event of a serious issue with the brake pedal or cruise control. The worst-case scenario just involves the cruise control system becoming non-operational until the code goes away for good.

What repairs can fix the P0571 code?

The most common potential repairs to address the P0571 code are as follows:

  • Electrical components and connections will be inspected for signs of damage or wear.
  • Any wires or connections that do not appear to be in good working order will be repaired or replaced.
  • Once the wiring is all in good shape, the mechanic will inspect the brake pedal and brake switch.
  • If there are any parts that need replacing, the mechanic will do so before resetting the code and test driving the vehicle to see if the code returns.
  • If the code does return, the the culprit may be the controls for the cruise control system located in the vehicle.
  • The controls for the cruise control system will be inspected and anything that isn’t in working order will be repaired or replaced.

Additional comments for consideration regarding the P0571 code

Many times, the P0571 code is caused by liquids being spilled in the interior of the vehicle. The liquid can get into the controls for the cruise control and cause corrosion and/or a short circuit. In these instances, the problem is within the control for the cruise control system.

Need help with a P0571 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....


Related questions

Q: Check Engine light on the Dashboard.

Hi there. The code P0420 could have an issue with the following: Having a damaged or failed oxygen sensor The engine coolant temperature sensor is malfunctioning Damaged or leaking exhaust manifold or leaking muffler / catalytic converter The spark...

Q: rough idle, heavy missing, fault codes P0301 and P0456. lack of power, where do i start to diagnose this?

Hi there. From the description you have provided, for the P0301 rough idle and heavy misfire and P0456 evaporative small leak detected, the problems are unrelated. The P0301 is a #1 cylinder misfire code. It could be, a spark plug...

Q: Engine light on

The Check Engine Light is an indicator that something is wrong. You should have the system scanned to retrieve the stored trouble codes and have them diagnosed. It can be on from something simple like a loose fuel cap to...