Code Definition

P07BF — Input/Turbine Speed Sensor A Circuit Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Toyota

About P07BF

P07BF is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P07BF is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P07BF is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The input or turbine speed sensor reports how fast the transmission input shaft is turning, which the control module compares against engine speed and output shaft speed to calculate torque converter slip, verify gear ratios, and schedule shift timing and line pressure. Most units are either a variable reluctance sensor generating its own alternating current signal from a toothed rotor, or a hall effect sensor supplied with a reference voltage and returning a square wave. DTC P07BF sets when the module detects the signal circuit sitting at an abnormally low voltage, which normally means a shor...

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