Transmission Fluid Temperature Sensor Circuit Intermittent
The P2744 code indicates that the Powertrain Control Module (PCM) has detected an intermittent signal from the Transmission Fluid Temperature (TFT) sensor circuit. This sensor monitors the temperature of the transmission fluid to optimize shift patterns and protect the transmission from overheating. An intermittent circuit issue can be caused by a faulty sensor, damaged wiring, or poor electrical connections, leading to erratic temperature readings.
1. Most Common Causes
- Loose, corroded, or oxidized electrical connections at the sensor or TCM
- Sensor wiring with intermittent open, bent, or chafing against the body
- Internally defective transmission fluid temperature sensor 'B' (intermittent thermal failure)
- Intermittent short to ground or voltage in the circuit harness
- Excessive engine or transmission vibration affecting the sensor connector
- Contaminated or degraded transmission fluid altering sensor readings
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or erratic shifting
- Transmission may go into limp mode
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to capture conditions when the intermittent fault occurred.
Step 2: Visually inspect the TFT sensor and its wiring harness for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the TFT sensor resistance at various temperatures and compare to manufacturer specifications.
Step 4: Check for continuity and shorts in the wiring between the sensor and PCM; repair or replace as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as an intermittent TFT sensor can cause transmission overheating or erratic shifting, potentially leading to transmission damage.
How much does it cost to fix?▼
The cost to fix P2744 typically ranges from $50 to $150, depending on whether the sensor or wiring needs replacement. Diagnostic fees may be additional.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.