Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0719 OBD-II Trouble Code: Torque Converter/Brake Switch B Circuit Low

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

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.

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...
P0684 OBD-II Trouble Code: Glow Plug Control Module to PCM Communication Circuit Range/Performance
P0684 code means there is a failing connection within the Glow Plug Control Module often due too corroded wires and solenoid failures.

Related questions

Q: P0420 - CATALYST B1 DETERIORATION

Hello - it is possible the 2 problems are related, but likely only over a long period of time. The P0420 code is a "low efficiency catalytic converter" for Bank2 - which include cylinder 1. And yes, that warning is...

Q: I have a lighting bolt icon on my dashboard

When you overheated the engine the check engine light came on most likely for the engine is hot and the lightning bolt comes on indicating the throttle limit control is on. This means the engine is in failure mode and...

Q: Car will start but will not go into drive or reverse. It revs up just fine, transmission was not slipping. Rear tire was covered in fluid.

Hello. I would need to know what kind of vehicle this is to be able to help you with specifics. From what you are explaining though it sounds like a transmission failure. When there is a transmission problem the vehicle...