OBD-II FAULT CODE
P1909

Trans Temp Sensor Circuit Open or Shorted to Pwr or Gnd

Reference information for P1909. Because this is manufacturer-specific, confirm the exact definition for the vehicle before using the diagnostic guidance below.

Manufacturer-specific code

This code can have different meanings depending on vehicle make, model and year. Treat the definition below as a reference and confirm it with OEM service information before diagnosis or repair.

PowertrainSystem
Electrical circuit / sensorCategory
MediumSeverity
  • Check Engine light
  • Poor drivability or reduced fuel economy depending on fault
  • Open circuit
  • Disconnected connector
  • Broken wire
  • Failed component
  • Scan all modules and record freeze-frame data before clearing codes
  • Check battery voltage and related fuses
  • Check connector fitment and continuity from module to component
  • Repair open wire/connector or replace the failed component after continuity test
Need more help?

Search manuals, wiring diagrams and technical service bulletins.

Not sure what to do next?
Get step-by-step instructions and professional repair information.
Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.