Code Definition

P1901 — Turbine Shaft Speed Sensor circuit intermittent

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1901

P1901 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1901 is stored, the module has detected 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.

P1901 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The turbine shaft speed sensor reports the rotational speed of the transmission input, or turbine, shaft, which the Powertrain Control Module compares against engine speed to calculate torque converter slip and against output shaft speed to verify the gear ratio actually achieved. That slip calculation drives torque converter clutch apply and release, shift timing, and clutch pressure control, so the signal is central to how the transmission feels rather than merely informational. Ford DTC P1901 sets when the PCM detects the turbine shaft speed signal dropping out, spiking, or behaving erratic...

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