P0940: The hydraulic oil temperature sensor signal is too high
The hydraulic oil temperature sensor signal is too high. Check the sensor, connector and wiring.
| Code | P0940 |
|---|---|
| System | Engine and transmission |
| Group | P09xx, Transmission |
| Type | Generic: it means the same on every make |
How to read and clear P0940 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0940 with its description and whether it’s confirmed, pending or permanent.
This code is usually stored by the gearbox control unit. If the car reports it over standard OBD, you read it for nothing with FREE; to read it straight from the gearbox control unit, with its description and clearing, you need PRO.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P093A The hydraulic accumulator solenoid has a broken or disconnected wire
- P093B The hydraulic accumulator solenoid gives a lower signal than normal
- P093C The hydraulic accumulator solenoid gives a higher signal than normal
- P093D The hydraulic accumulator solenoid gives readings outside the normal range
- P0941 The hydraulic oil temperature sensor circuit has an intermittent fault
- P0942 The hydraulic pressure unit is not working properly
- P0943 The hydraulic pressure unit cycles too quickly
- P0944 The hydraulic pressure unit is losing pressure
What does code P0940 mean?
The hydraulic oil temperature sensor signal is too high. Check the sensor, connector and wiring.
How do you clear P0940?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0940 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
