P0724 OBD-II Trouble Code: Torque Converter/Brake Switch B Circuit High

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0724 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0724 code

P0724 is a diagnostic trouble code (DTC) for "Torque Converter/Brake Switch B Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0724 DIAGNOSTIC Get a fair and transparent estimate upfront

P0724 OBD-II Trouble Code: Torque Converter/Brake Switch B Circuit High

P0724 code definition

The P0274 code signifies that the computer has detected a fault in the brake switch B circuit, which includes the cruise control system, and the torque converter.

What the P0724 code means

The P0724 code means that the computer has detected a fault in the brake switch B circuit. This circuit includes the torque converter lock-up system, as well as the car’s cruise control system. When you press the brake pedal, the brake switch operates several circuits. One of those includes the transmission interlock switch, which allows you to shift the transmission out of park. The brake switch B circuit allows the cruise control system to be disengaged by tapping the brake pedal, as well as ensuring that the torque converter lock-up system disengages when coming to a stop.

What causes the P0724 code?

There are only a handful of potential causes for the P0724 code, including the following:

  • A failed or faulty brake switch
  • A misadjusted brake switch
  • Open or short in brake switch harness
  • Loose or poor connection in brake switch circuit
  • Blown brake light fuse
  • Faulty bulb sockets (rare)

What are the symptoms of the P0724 code?

You may experience one or more symptoms when the P0724 code is stored, including the following:

How does a mechanic diagnose the P0724 code?

The first step in any diagnosis is to connect an OBD II scanner to the vehicle and check the codes stored. With a P0724 code, chances are good that there are additional codes stored, as well. The brake light fuse should be checked. If it is blown, it must be replaced before further diagnostics can be completed.

Next, the mechanic should check the brake light switch adjustment, as well as the wiring and connectors. If the switch is within adjustment specs and no damage is seen with the wiring, the switch should be tested. If the reference voltage is incorrect (or no voltage is detected), the switch should be replaced. Once the switch has been replaced, the system should be retested. The codes should be cleared and the vehicle should be test driven (and brake light operation should be checked prior to driving the car).

If the problem is not related to the switch, the mechanic will need to inspect the torque converter lock-up solenoid and wiring.

Common mistakes when diagnosing the P0724 code

The most common mistake here is assuming that the problem is with the transmission. In almost all cases, the problem is with the brake light switch, connector, wiring or fuse.

How serious is the P0724 code?

The P0724 code is very serious and will affect the drivability of the car. Depending on the symptoms being experienced, you may be stranded in traffic if the engine stalls while stopping, or you may have no brake lights to tell drivers behind you on the road that you’re slowing down, resulting in an accident that could have been completely avoided. Have this code diagnosed and repaired immediately.

What repairs can fix the P0724 code?

The most common repair here is replacement of the brake light switch. Others include:

  • Adjusting the brake light switch
  • Repairing or replacing damaged wiring
  • Replacing a blown fuse
  • Replacing a failed torque converter lock-up solenoid

Additional comments for consideration regarding the P0724 code

Note that the Check Engine Light may or may not come on when the P0724 code is stored, depending on which system (PCM or ABS) noted the voltage abnormality.

Need help with a P0724 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 1-800-701-6220.

trouble codes
P0724
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0724 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P0455 OBD-II Trouble Code: System Gross Leak Evaporative Emission
P0455 Trouble Code definition System Gross Leak Evaporative Emission The Code P00455 code is often associated with P0440 code. What...
B1942 OBD-II Trouble Code: Airbag Crash Sensor #2 Feed/Return Circuit Open
B1942 means there is a fault in the voltages to two terminals in the airbag circuit, likely due to a bad sensor or open circuit issue.
P3419 OBD-II Trouble Code: Cylinder 3 Deactivation/Intake Valve Control Circuit Low
P3419 means a problem was detected with the cylinder deactivation mode due to bad lifters, sensors, solenoids, electrical issues, or low oil pressure.

Related questions

Car wont move when I step on the gas. I was driving when this happened

Hello, thank you for writing in. There are several reasons the gas pedal may become unresponsive. The first step is to have it scanned for diagnostic codes, to find out what issues the vehicle's computer has detected. This will narrow...

Check engine sign on

Most Check Engine Lights are illuminated when an error code is triggered and stored in the ECM. Even if you've repaired what was broken or damaged, you still need to clear those codes in order for the light to go...

What does code P0008 mean when the engine light is on

Yes, a P0008 code is related to your engine's timing. More than likely, you need to have the timing chain and/or tensioners replaced. If you would like to have this done or would like to have a second check, a...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com