P0719 — Brake Switch “B” Circuit Low #

Please note: The exact description of code P0719 may vary depending on the vehicle manufacturer.

• Brake Switch “B” Circuit Low (Generic/EOBD/OBD-II)
• Brake Pedal Position/Stop Lamp Switch “B” Circuit Low — Ford
• Stop Lamp Switch Circuit Low — GM/Chevrolet
• Brake Switch 2 Circuit Low — Toyota/Lexus
• Brake Pedal Position Sensor 2 Circuit Low — Volkswagen/Audi

Summary of Code P0719 #

P0719 is a diagnostic trouble code (DTC) triggered when the powertrain control module (PCM) detects a low voltage condition in the Brake Switch “B” circuit. The brake switch is a crucial input to the vehicle’s electronic control systems, telling them when the brake pedal is pressed. Circuit “B” generally refers to a secondary or redundant brake pedal position signal, often used by automatic transmissions, stability control, and cruise control modules. A “low” signal means the PCM is seeing less voltage than expected—often close to zero—when it should detect a higher voltage. This may impact shifting, cruise control, or even stability and traction systems.

Frequent Symptoms for Code P0719 #

A malfunction in the Brake Switch “B” circuit can cause a range of symptoms, some of which may not seem directly related to the brake lights. These include:

• Transmission not shifting out of park (AT vehicles)
• Brake lights not working or stuck on
• Cruise control inoperative
• ABS or traction control warning lights illuminated
• Check engine light (MIL) on
• Possible stalling or poor idle (rare)

Probable Causes for Code P0719 #

Most cases of P0719 are due to electrical or sensor-related issues. The most common causes, ranked by frequency, include:

1. Faulty brake pedal switch (stop lamp switch)
2. Damaged, corroded, or disconnected wiring/connectors at the brake switch
3. Blown fuse in the brake light or stop lamp circuit
4. Faulty or misadjusted brake pedal position sensor
5. Ground issue in the brake switch circuit
6. Faulty PCM or TCM (rare)

Step-by-Step Diagnostic for Code P0719 #

Diagnosing P0719 doesn’t require advanced tools, but a digital multimeter and a basic scan tool will make the process much easier. Here’s a logical diagnostic path:

1. Verify the DTC — Read all stored fault codes and freeze-frame data. Clear codes and see if P0719 returns after cycling the ignition and pressing the brake pedal.
2. Check brake lights — With ignition ON, press the brake pedal and check that all brake lights illuminate. If not, proceed to the next step.
3. Inspect brake switch — Locate the brake pedal switch (usually mounted above the pedal). Inspect for physical damage, loose connector, or misalignment.
4. Test brake switch output — Use a multimeter to test for voltage at the switch’s output wires with the pedal pressed and released. Compare to wiring diagram specifications.
5. Check wiring and connectors — Visually inspect for broken, chafed, or corroded wires and connectors between the switch and the PCM/TCM. Repair as needed.
6. Test circuit continuity — Use a multimeter (ohmmeter mode) to confirm continuity from the brake switch to the PCM on the B-circuit wire.
7. Check relevant fuses — Inspect and test all fuses related to brake lights and PCM inputs.
8. If necessary, test PCM inputs — If no issues found, use a scan tool to monitor live brake switch data. In rare cases, substitute a known-good PCM as a final test.

Possible Repairs for Code P0719 #

Once the root cause is identified, repairs will focus on restoring proper voltage and continuity to the Brake Switch “B” circuit. Depending on your diagnosis, solutions include:

• Replace faulty brake pedal switch
• Repair or replace damaged wiring/connectors
• Replace blown fuse
• Adjust or replace brake pedal position sensor (if equipped)
• Repair ground connection in the brake switch circuit
• Replace PCM or TCM (only after ruling out all other causes)

Can You Drive with Code P0719? #

Driving with code P0719 is generally not recommended. While the vehicle may still operate, the loss of brake switch input can disable crucial safety systems like ABS, traction control, and even prevent shifting out of park on automatics. In some cases, your brake lights may not work, posing a serious safety and legal risk. Immediate diagnosis and repair are strongly advised.

Vehicles Most Commonly Affected by Code P0719 #

P0719 is a generic OBD-II code seen across many brands, but tends to be most common in certain models due to switch or wiring design. Vehicles frequently reporting this code include:

• Ford Focus, F-150, Escape, Explorer
• Chevrolet Silverado, Malibu, Cruze
• Volkswagen Jetta, Passat, Golf
• Toyota Corolla, Camry, Tacoma
• Honda Accord, Civic (some models)
• Chrysler/Dodge RAM, Grand Caravan

Common Mistakes & Best Practices with Code P0719 #

Misdiagnosis is common with P0719, especially when making assumptions based solely on symptoms. To avoid wasted time and expense:

• Don’t replace the brake switch without testing it first. Many times, wiring or connector issues are to blame.
• Always check fuses and ground connections before replacing parts.
• Don’t ignore related DTCs. Codes for shift interlock, cruise control, or tail lamps may offer additional clues.
• Use the right wiring diagram for your VIN and build date. Pinouts may differ between model years.
• Perform a thorough visual inspection before using advanced diagnostic tools.

Quick FAQ for Code P0719 #

Here are fast answers to common questions about P0719:

• Q: Will a blown brake light bulb trigger P0719?
  A: Usually not. This code is triggered by voltage at the switch, not the bulbs themselves. However, a blown fuse affecting the switch circuit can cause it.
• Q: Can I reset the code and keep driving?
  A: Resetting the code without addressing the cause is not safe. Loss of brake lights or shift interlock function could leave you stranded or unsafe to drive.
• Q: Is the Brake Switch “B” circuit the same as the main brake light switch?
  A: Not always. Many modern vehicles use two independent brake switch circuits (A and B) for redundancy and different electronic modules.