P0719 Code: Brake Switch B Circuit Low
🟠 Moderate severity · drivable
You can keep driving, but check that your brake lights still work, since a faulty brake switch can leave them off.
What P0719 means
Circuit B of the brake switch is reading too low, which usually means a short to ground, a blown fuse, or a faulty switch. The transmission uses the brake switch signal to unlock the torque converter when you press the brakes, so a bad reading can affect that.
Symptoms
- Check engine light is on
- Brake lights may not come on
- Cruise control may not work
- Torque converter may not unlock when braking
Common causes
- most common: Faulty brake switch
- common: Blown fuse for the brake light circuit
- common: Wiring shorted to ground
- less common: Misadjusted brake pedal switch
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check brake light bulbs and fuses | Yes | $5–20 |
| Adjust or replace the brake switch | Yes | $20–80 |
| Repair shorted wiring or connector terminals | Mechanic | $80–250 |
Frequently asked questions
Can I drive with a P0719 code?
Yes, but first confirm your brake lights work. If they don't, fix the switch right away, since drivers behind you need to see your brake lights.
What is the difference between P0703 and P0719?
P0703 is a general problem with the brake switch B circuit. P0719 is more specific: the circuit signal is reading too low, usually from a short to ground or a bad switch.
How much does it cost to fix a P0719?
A new brake switch costs about $20–$80 and is often a DIY job. Wiring repairs add a bit more.
Related codes
P0703
P0703 Code: Brake Switch B Circuit
P0724P0724 Code: Brake Switch B Circuit High
P0700P0700 Code: Transmission Control System Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.