P081F
Brake Transmission Shift Interlock (BTSI) Signal Correlation
Generic OBD-II
Common symptoms
What you'll notice
- Check for any loose or faulty connections to the Brake Transmission Shift Interlock (BTSI) system.
- Inspect and replace any damaged or worn out wiring related to the BTSI system.
- Verify the functionality of the brake light switch and replace it if necessary.
- Inspect the brake pedal position sensor and adjust or replace it as needed.
- Consider resetting the BTSI system by disconnecting the vehicle's battery for a few minutes and reconnecting it. Ensure to follow any specific instructions provided by the vehicle manufacturer.
Common causes
Most likely first
- Faulty brake light switch
- Damaged wiring or electrical connection related to the brake light switch
- Malfunctioning BTSI solenoid or actuator
- Low brake fluid level or faulty brake fluid pressure sensor
- Incorrect adjustment or misalignment of the BTSI system components
How to diagnose & fix
Work through it in order
- Gear shift lever stuck in park position
- Inability to shift out of park
- Brake lights not working properly
- Intermittent or inconsistent shifting between gears
- Engine starting issues or difficulty starting the vehicle
Read & clear P081F yourself
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