P1909 Ford Code - Transmission Temperature Sensor Circuit Open or Shorted to Power Or Ground
Quick Answer
The P1909 Ford diagnostic trouble code (DTC) indicates a problem with the transmission temperature sensor circuit being open or shorted to power or ground. Common causes include Damaged wiring or connectors in the transmission temperature sensor circuit, Faulty transmission temperature sensor, Corrosion or contamination in the sensor connector. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1909 Ford indicates Transmission Temperature Sensor Circuit Open or Shorted to Power Or Ground.
- Common causes
- Common causes include Damaged wiring or connectors in the transmission temperature sensor circuit, Faulty transmission temperature sensor, Corrosion or contamination in the sensor connector.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1909 Ford Description
The P1909 Ford diagnostic trouble code (DTC) indicates a problem with the transmission temperature sensor circuit being open or shorted to power or ground. The transmission temperature sensor is a crucial component that monitors the temperature of the transmission fluid. This information is essential for the vehicle's onboard computer to adjust various parameters, such as shift points, pressure levels, and torque converter lockup, to ensure optimal performance and efficiency.
Common Causes of P1909 Ford
- Damaged wiring or connectors in the transmission temperature sensor circuit
- Faulty transmission temperature sensor
- Corrosion or contamination in the sensor connector
- ECM issues affecting temperature sensor readings
- Electrical system malfunctions
Symptoms of P1909 Ford
- Check engine light illuminated
- Transmission temperature gauge showing incorrect readings
- Transmission shifting irregularly or harshly
- Decreased fuel efficiency
- Transmission overheating warning light
How to Fix P1909 Ford
- Begin by conducting a visual inspection of the transmission temperature sensor circuit, looking for any visible damage, corrosion, or loose connections.
- Test the transmission temperature sensor using a multimeter to determine if it is functioning correctly.
- Check the wiring harness and connectors for any signs of damage or wear, repairing or replacing as needed.
- Clear the DTC from the vehicle's ECM using a diagnostic scanner, and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, consider seeking professional assistance to diagnose and repair any underlying ECM or electrical system issues.
Cost to Fix P1909 Ford
The typical repair costs for addressing a P1909 Ford DTC can vary depending on the specific cause of the issue. In general, you can expect to pay anywhere from $100 to $300 for parts and labor to resolve this problem. However, it's important to note that the actual cost can fluctuate based on factors such as the location of the repair shop, the make and model of the vehicle, and the complexity of the repair. Additionally, diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour, so it's advisable to inquire about local rates for a more accurate estimate.
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