Torque Converter/Brake Switch B Circuit Low
The P0719 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the torque converter clutch (TCC) brake switch B circuit. This switch is part of the brake pedal position sensor system and signals when the brake pedal is pressed. A low voltage reading suggests a short to ground, open circuit, or faulty switch, which can prevent the torque converter from unlocking properly during braking, leading to drivability issues.
01. Most Common Causes
- Faulty brake switch B
- Short to ground in brake switch B circuit
- Open circuit in brake switch B wiring
- Corroded or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Torque converter not unlocking during braking
- Harsh or delayed shifts
- Stalling when coming to a stop
- Cruise control inoperative
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify code P0719 and check for other related codes.
Step 2: Inspect brake switch B wiring and connector for damage, corrosion, or loose connections.
Step 3: Test brake switch B operation with a multimeter; check for proper voltage and continuity.
Step 4: If switch is faulty, replace it; if wiring issue, repair as needed.
Step 5: Clear code and test drive to confirm repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause stalling, harsh shifting, and potential transmission damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150, including parts and labor. A brake switch replacement is usually under $50 for the part, with labor adding $50-$100.