P2740 to P2744, P2753 to P2755 and P0897: fluid temperature, cooler and fluid condition
The second transmission fluid temperature sensor (B) has a circuit fault or an implausible reading, the circuit that controls the transmission fluid cooler is open, low or high, or the computer judges that the fluid has deteriorated (P0897).
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P2740 mean?
Some gearboxes measure fluid temperature in two places and control a valve or a fan for their own fluid cooler. If the second sensor fails, the computer guesses the temperature and protects the gearbox with firmer changes and less lockup. If the cooler control fails, the fluid can run hotter than it should. P0897 is different: many gearboxes count the heat and work the fluid has been through, and this code says the fluid has reached the end of its life, often after hard use, and should be changed.
What causes P2740?
- Fluid used for a long time, or used hard by towing or heavy loads
- A failed second temperature sensor or its internal wiring
- A faulty cooler valve or cooler fan circuit, or a blocked cooler
- A connector on the gearbox that lets fluid in
What to check first for P2740
- Ask when the fluid was last changed and whether the car tows
- Look at the fluid color and smell where it can be checked
- Check the cooler and its lines for blockage and leaks
- Compare both fluid temperature readings on a scan tool after a drive
Can you drive with P2740?
Usually you can drive to a workshop. Avoid towing, long climbs and hard driving until the cooling or the fluid is sorted, because heat is what wears an automatic gearbox fastest.
Clear a code only after the fault is fixed. A code that comes back means the cause is still there, and a warning light left on can hide a second fault behind the first.
Codes on this page
9
- P2740Transmission Fluid Temperature Sensor "B" Circuit
- P2741Transmission Fluid Temperature Sensor "B" Circuit Range/Performance
- P2742Transmission Fluid Temperature Sensor "B" Circuit Low
- P2743Transmission Fluid Temperature Sensor "B" Circuit High
- P2744Transmission Fluid Temperature Sensor "B" Circuit Intermittent
- P2753Transmission Fluid Cooler Control Circuit/Open
- P2754Transmission Fluid Cooler Control Circuit Low
- P2755Transmission Fluid Cooler Control Circuit High
- P0897Transmission Fluid Deteriorated
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
