P0719 OBD-II Trouble Code: Torque Converter/Brake Switch B Circuit Low

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Cost of diagnosing the P0719 code

P0719 is a diagnostic trouble code (DTC) for "Torque Converter/Brake Switch B Circuit Low". 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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Check Engine Light

P0719 code definition

When the PCM has stored the P0719 code, it indicates that there has been an abnormal voltage reading from the brake switch B circuit.

What the P0719 code means

The brake switch B circuit is part of the torque converter clutch system. This indicates the status of the brake pedal, and works as part of the system that deactivates the torque converter lock-up and cruise control. If the PCM detects an abnormal reading from the brake switch, it will store the P0719 code.

What causes the P0719 code?

The most likely cause of a low voltage reading in the torque converter/brake switch B circuit is a defective brake lamp switch, or a blown lamp fuse. There are several other possible causes, however, including:

  • Shorted, corroded, or open wiring
  • Shorted, corroded, or open electrical connectors
  • Blown bulbs
  • Misadjusted brake lamp
  • Faulty bulb sockets
  • Faulty PCM (only in very rare cases)

What are the symptoms of the P0719 code?

If the P0719 code is stored in the PCM, there are several symptoms that may be observed. These include:

  • Brake lamps that either do not illuminate, or that do not turn off.
  • Torque converter that does not lock up.
  • Torque converter lock-up that will not disengage.
  • Stalling when coming to a full stop.
  • Illuminated Check Engine lamp.
  • Other torque converter or torque converter clutch codes are likely to be stored in the PCM with this code.

How does a mechanic diagnose the P0719 code?

After an OBD-II scanner detects the P0719 code, a technician should begin with a visual inspection of all the wiring, connectors, and other components of the torque converter system. Any damaged elements should be replaced, reconnected, or repaired as necessary. They should then clear the code and perform a retest, checking that the Check Engine light does not reappear.

If the Check Engine lamp and code reappear immediately, then the mechanic should check for battery voltage with a digital volt/ohmmeter on the input and output sides of the brake lamp switch, as well as checking for continuity between the fuse and the input circuit. If any open or shorted circuits are found, they should be repaired. If voltage is found on the input side, and not on the output side of the brake lamp switch, it is likely that the brake lamp switch is faulty. This is one of the most common causes of this code.

If this is not the case, the mechanic should continue attempting to check for signals between components, checking for loose or faulty electrical components, and performing other repairs as necessary until the issue is found.

Common mistakes when diagnosing the P0719 code

When diagnosing the underlying cause of the P0719 code, the most common misdiagnosis is to blame the lock-up solenoid or the wiring, rather than to check the stop lamp switch, the lighting controller, or the brake lamp connectors and circuitry.

How serious is the P0719 code?

If the P0719 code is being detected, it should be addressed right away. This issue can seriously affect the drivability and safety of a vehicle.

What repairs can fix the P0719 code?

There are many ways that a technician can address a P0719 code detection. They include:

  • Replacing a defective brake lamp switch.
  • Replacing a blown lamp fuse.
  • Repairing or replacing shorted, corroded, or open wiring.
  • Repairing or replacing shorted, corroded, or open electrical connectors.
  • Replacing any blown bulbs.
  • Adjusting a misadjusted brake lamp
  • Repairing faulty bulb sockets.
  • Replacing a faulty PCM (only in very rare cases).

Additional comments for consideration regarding the P0719 code

It is always important to remember that after each potential solution is attempted, the code should be cleared from the PCM and the car should be retested. This process can help narrow down the true cause of the P0719 code, making it much easier to repair.

Need help with a P0719 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.

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