Skip the auto shop - Our mechanics make house calls

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

check engine light

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.

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

How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...


Related questions

Q: P1404 check engine code showing and EGR pintle is .5

Hello. Most of the time this is caused by a bad EGR valve. I usually remove the valve and inspect the ports for the EGR valve. If these ports are clogged then the problem will persist. It is possible that...

Q: The P0010 error keep coming up and my car keeps jumping, and turning itself off and on while I drive sometimes.

Hello, thanks for writing in. If you took your vehicle in for repairs, and it was returned with a check engine light then I would immediately return to the shop and have them take care of the issue. If the...

Q: Problem starting car and dies while driving

This sounds like it could be a faulty crankshaft sensor or a camshaft sensor. These engines had problems with both. The hard start and the backfire may be the camshaft sensor. The stall and no start condition may be from...