Code result
P07BF
Input/Turbine Shaft Speed Sensor A Circuit Low
High severity
What it means
Input/turbine shaft speed sensor A signal voltage below the lower limit — short to ground or open supply. Without this signal the TCM cannot calculate slip across the torque converter or first gear element.
Is it safe to drive?
No — stop driving
This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly.
Most likely causes
Signal wire shorted to ground
highOne of the most commonly reported causes for this code — check this first.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Harness chafing through insulation
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P07BF freeNo credit card required