Code Definition

P1900 — Turbine Speed Sensor Circuit Intermittent

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

About P1900

P1900 is a manufacturer-specific powertrain diagnostic trouble code recorded for Mazda vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1900 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.

P1900 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

This code is set when the Transmission Control Module (TCM) detects an intermittent or erratic signal from the turbine speed sensor. The turbine speed sensor monitors the rotational speed of the torque converter and sends this data to the TCM for proper transmission control. If the signal is lost or fluctuates unexpectedly, the TCM logs this fault.

Quick Facts