Can You Continue Driving When the AT Light Is On?
2 Answers
at light is the transmission fault indicator, it is recommended not to continue driving and to seek immediate repair. Reasons for the transmission fault light to illuminate: Intermittent or persistent faults in the automatic transmission's electronic components (sensors, solenoids, control module). Mechanical failures in automatic transmission models, such as engine idling, transmission slipping, or other severe transmission issues, which trigger the transmission control unit to activate fault alerts and illuminate the transmission fault light. Transmission fluid overheating causing the fault light to come on, such as overfilling the transmission fluid, internal or external blockage of the transmission cooler (common during high-temperature seasons), or transmission high-temperature protection due to torque converter lock-up slippage. Symptoms of transmission faults: Delayed response: The transmission should shift quickly and accurately to the correct gear. Difficulty or hesitation during shifting indicates a problem. Difficulty starting: If the engine revs up when accelerating but the car does not accelerate noticeably, it may be due to transmission fluid leakage, which reduces internal lubrication, increases gear friction, and prevents normal operation. Engine stalling after shifting: If the engine stalls immediately after shifting from P to another gear upon starting the car, it may be due to a faulty lock-up solenoid, stuck or damaged lock-up control valve, or input shaft speed sensor failure.
When the AT light comes on, my experience tells me there's an issue with the transmission—this is no small matter. The AT light typically indicates a fault in the automatic transmission, such as a sensor false alarm, low oil pressure, or internal component wear. Continuing to drive can easily lead to overheating, abnormal gear shifts, or even complete transmission failure. I recommend pulling over immediately and not pushing your luck. After stopping, first check if the transmission fluid level on the dipstick is within the normal range; if it's low, you can try adding some fluid. However, in most cases, a professional technician will need to use diagnostic equipment to read the trouble codes. Don’t let the fact that you can still drive a short distance lull you into complacency—the risk cost is very high. Remember, safety comes first, and be extra cautious if you experience delayed shifting or jerky movements.
