95 Dodge Diesel 48re transmission scheduled for a rebuild out of town to be towed. Wanted a “local” second opinion, not to many transmission specialists in Red Bluff. Called around ended up at Kuypers for second opinion. SURPRISE!! Rebuild not needed just yet. REBUILD Cost: $3,000.00+ KUYPERS Kure: $338.19 What sensor controls the transmission temperature? Thermometrics Transmission Fluid Temperature Sensor Thermometrics Transmission Fluid Temperature Sensor (TFT) measures the temperature of transmission fluid. It provides input to the control module to modify shift patterns for smoother shifting in automatic transmissions, and also provides over-temperature protection by locking the torque converter. Vehicle becomes locked in a single gear. Many modern vehicles are equipped with failsafe devices, which prevent the transmission from shifting gears if a mechanical or electrical problem is detected. If your transmission position sensor is failing, your transmission may become locked in an unchanging gear. This condition is known as limp mode, and a car that has gone into limp mode is suffering from severe transmission issues.