P1900 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

P1900 Code failures by brands

P1900 FORD, MERCURY, LINCOLN: OUTPUT SHAFT SPEED (OSS) SENSOR - CIRCUIT INTERMITTENT

Description of DTC code P1900

The Output Shaft Speed Sensor (OSS) provides the PCM (Powertrain Control Module) with relevant data on the rotational speed of an output shaft. This module uses this information for the control and diagnosis of powertrain behavior. On some vehicle models, this sensor is also used as a speed source. The location of the OSS sensor varies from manufacturer to manufacturer. Its design is unique and depends on the powertrain control features used to generate the data.

The P1900 OBD2 fault code on Mercury, Ford, and Lincoln vehicles is set when the PCM detects that the signal received from the Output Shaft Speed Sensor is erratic or has been interrupted.

Symptoms of fault code P1900

Causes of OBD2 P1900

Reasons for storing the P1900 OBDII diagnostic code:

  • The Output Shaft Speed Sensor connectors or wires may be damaged.
  • The OSS Sensor may not be installed correctly.
  • The Output Shaft Speed Sensor may be faulty.

Possible solutions of the DTC code P1900

To troubleshoot the OBD2 DTC P1900, try this:

  • See Technical Service Bulletins.
  • Check for common deficiencies in the OSS Sensor wiring or connectors. If you discover burnt or corroded conditions, make the appropriate repairs.
  • Inspect the OSS Sensor circuit electrical connections and verify that the OSS Sensor circuit voltages are the way indicated on the vehicle's data source. If an open or shorted circuit is detected, make the right repairs.
  • Check that the Output Shaft Speed Sensor is installed correctly. Check that it is properly adjusted. Make any necessary corrections.
  • Check the integrity of the Output Shaft Speed Sensor. If it is faulty, you will need to replace it.

 

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