What Causes High Transmission Temperature?
2 Answers
Generally, the active safety features already included in a car's safety system ensure the vehicle's reliability and safety during both normal road and off-road driving. When the transmission oil temperature reaches 115 degrees, the DTC (Diagnostic Trouble Code) will be set and store information to assist technicians in analysis. The reasons for high transmission temperature are as follows: 1. Clogged radiator grille; 2. Transmission clutch slipping, generating additional heat; 3. Insufficient flow in the transmission cooling oil circuit; 4. Thermostat sticking. The solutions for high transmission temperature are as follows: 1. Clean the radiator; 2. Repair the torque converter; 3. Repair the valve body or replace the oil pump; 4. Replace the thermostat.
Last time I drove long distance, I also encountered a transmission temperature warning, which made me sweat profusely! This kind of issue requires a thorough check of the cooling system—insufficient coolant or a clogged radiator can prevent heat dissipation. For older cars, pay special attention to whether the transmission fluid has deteriorated and turned black; low-quality fluid is like burnt porridge and can’t withstand high temperatures. Also, for vehicles frequently climbing hills or hauling heavy loads, clutch plate wear is like eating into savings—the more you use, the hotter it gets. The weirdest case I’ve seen while repairing cars was a faulty temperature sensor giving false alarms, but never gamble on luck. If you see a red warning light on the dashboard, pull over immediately. Wait for it to cool down, then drive slowly to the repair shop. Pushing through could cost you tens of thousands to replace the entire transmission.
