The Transmission ECU does not allow shifts into any gear range if the fluid temperature is below -25°F (-32°C). If the fluid temperature rises to 270°F (132°C), the shift control check light is illuminated and a code is stored in the ECU memory. Which statements are correct?

The Transmission ECU does not allow shifts into any gear range if the fluid temperature is below -25°F (-32°C). If the fluid temperature rises to 270°F (132°C), the shift control check light is illuminated and a code is stored in the ECU memory. Which statements are correct?

• A. The Transmission ECU Does Not Allow Shifts into Any Gear Range if the Fluid Temperature Is Below -25°F (-32°C)
• B. If the Fluid Temperature Increases to 270°F (132°C), the Check Transmission Light Is Illuminated
• C. Both Statements Are Correct
• D. Neither Statement Is Correct

Answer: (C)

The Transmission ECU uses fluid temperature to protect the gearbox. When the transmission fluid is very cold, its high viscosity makes hydraulic control unreliable, so the ECU prevents shifting into any gear range to avoid damaging the transmission. Conversely, if the fluid temperature reaches about 270°F (132°C), the ECU detects an overheating condition, lights the check transmission indicator, and stores a diagnostic code so the issue can be diagnosed. Because these are both parts of the same temperature-based protection logic, both statements are true.

The Transmission ECU uses fluid temperature to protect the gearbox. When the transmission fluid is very cold, its high viscosity makes hydraulic control unreliable, so the ECU prevents shifting into any gear range to avoid damaging the transmission. Conversely, if the fluid temperature reaches about 270°F (132°C), the ECU detects an overheating condition, lights the check transmission indicator, and stores a diagnostic code so the issue can be diagnosed. Because these are both parts of the same temperature-based protection logic, both statements are true.