Code Definition

P1900 — Cooling Fan

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

About P1900

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

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 triggered when the Engine Control Module (ECM) detects an issue with the cooling fan control circuit or its operation. The ECM monitors the cooling fan relay, fan motor speed, and electrical circuit integrity. If the fan does not operate as commanded or if there is an electrical fault, the ECM sets this code.

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