P1909
Transmission Temperature Sensor Circuit Open or Shorted to Power Or Ground
P1909 is an OBD-II diagnostic trouble code meaning: Transmission Temperature Sensor Circuit Open or Shorted to Power Or Ground. Common causes: broken wires to the temperature sensor, short circuit in the sensor circuit. Estimated repair cost: $17–67.
Symptoms
- Emergency mode of automatic transmission (fixed gears)
- Unstable gear shifting
- The Check Engine light comes on
- Floating engine speed
- No transmission temperature reading on dashboard
Causes
- Broken wires to the temperature sensor
- Short circuit in the sensor circuit
- Malfunction of the temperature sensor itself
- Damage to the sensor connector
- Problems with the automatic transmission control unit
How to Fix
- Check the integrity of the wiring to the sensor
- Measure the sensor resistance (compare with the nominal value)
- Check the voltage in the sensor circuit
- Inspect the connector for oxidation or damage.
- If necessary, replace the automatic transmission temperature sensor
Related codes
FAQ
What does the P1909 code mean?
P1909 is an OBD-II diagnostic trouble code that indicates: Transmission Temperature Sensor Circuit Open or Shorted to Power Or Ground
What causes a P1909 error code?
The most common causes of P1909 include: Broken wires to the temperature sensor; Short circuit in the sensor circuit; Malfunction of the temperature sensor itself; Damage to the sensor connector.
How do I fix a P1909 diagnostic trouble code?
To fix P1909: Check the integrity of the wiring to the sensor. Measure the sensor resistance (compare with the nominal value). Check the voltage in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1909?
Limited driving only, diagnose soon
How much does it cost to fix P1909?
The estimated repair cost for P1909 is $17–67. Actual cost depends on your vehicle, location, and labor rates.
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