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

Our certified mechanics come to you · 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 1-800-701-6230.

trouble codes
P0724
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0724 code.

SCHEDULE P0724 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

P2774 OBD-II Trouble Code: 4WD Low Switch Circuit High
P2774 means a problem in the actuator switch circuit for 4WD. Problems may include faulty sensors, solenoids, switches and defective wiring harness.
P2068 OBD-II Trouble Code: Fuel Level Sensor “B” Circuit High
P2068 P2068 trouble code definition Fuel Level Sensor “B” Circuit High What the P2068 code means This code indicates the fuel level sensor is indicating a higher than expected voltage. The higher the value the more fuel is in the...
P2134 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch F Circuit Intermittent
What What the P2134 code means? P2134 is an OBD-II generic code for the engine control module (ECM) detecting the throttle pedal position sensor F has an intermittent sensor return to the ECM What causes the P2134 code? The...

Related questions

I replaced the output shaft sensor. Do I need to reset the code?

Try removing the battery cables and letting the computer sit for about 1 minute and then hook up the cables or if you have a scanner that can erase the codes. This will clear the engine light and codes to...

Why am I getting rich codes in my 2012 Chevrolet Silverado

Claimed by Robert Tomashek

What could be wrong with my vehicle? It stalled on the highway.

Hi, first task is to check for the problem codes that are setting the Check Engine Light. Since you have a "hard stop" failure, this become even more important. First level isolation is to see if you have spark, or...

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 (855) 347-2779 · hi@yourmechanic.com