Powertrain
generic / SAE
P081F
Brake Transmission Shift Interlock (BTSI) Signal Correlation
The Brake Transmission Shift Interlock prevents shifting out of Park unless the brake pedal is pressed. The TCM compares the brake-pedal input to the BTSI solenoid command and detects an inconsistency — for example shift permitted while brake not pressed, or interlock active while brake is pressed.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number8 / 1F
Possible causes
- Stuck brake pedal switch high
- Mis-adjusted BTSI mechanism medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: btsi solenoid
- Component: brake pedal switch
- MIL / check engine light
Sources
References
sae:J2012