P075F Too high transmission fluid level

P075F Too high transmission fluid level

OBD-II DTC Datasheet

Too high transmission fluid level

What does this mean?

This Generic Transmission Diagnostic Trouble Code (DTC) usually applies to OBD-II equipped vehicles that have a transmission fluid level sensor. Vehicle brands may include, but are not limited to, GM, Chevrolet, Ford, Dodge, Ram, Toyota, Hyundai, etc. This code is rare.

If you have this code P075F, then most likely your vehicle has a transmission fluid level (TFL) sensor. It is used to determine the level of transmission fluid inside the transmission, as an incorrect level can damage the transmission.

TFL sensors receive a voltage reference from the PCM. The PCM monitors the circuit and when it detects that the level is too high out of range, it sets this DTC and presents the driver with an engine warning light or a transmission warning light.

The P075F code is set when the PCM detects that the transmission fluid level is too high. Associated codes include P070A, P070B, P070C, P070D, P070E, and P070F.

Code severity and symptoms

The severity of this transmission code is moderate to severe. In some cases, high transmission fluid levels left unattended can damage the transmission. It is recommended to fix this code as soon as possible.

Symptoms of a P075F trouble code may include:

• Transmission warning light
• Check Engine Light
• Drivetrain performance issues

Common Causes of This DTC

Possible causes of this P075F transmission fluid level code may include:

• Defective transmission fluid level sensor
• High transmission fluid level (most likely)
• Electrical and / or wiring problems
• Defective PCM

Diagnostic and repair procedures

Start by checking the level and condition of the transmission fluid according to the manufacturer's recommendations. Then inspect the transmission fluid level sensor and associated wiring. Look for loose connections, damaged wiring, etc. If damage is found, repair as needed, clear the code and see if it returns. Then check the technical service bulletins (TSBs) for the problem. If nothing is found, you will need to proceed to the step-by-step system diagnostics.

The following is a generalized procedure as the testing of this code differs from vehicle to vehicle. To accurately test the system, you need to refer to the manufacturer's diagnostic flowchart.

Check the wiring

Before proceeding, you need to consult the factory wiring diagrams to determine which wires are which. Autozone offers free online repair guides for many vehicles and ALLDATA offers a one-car subscription.

Check the reference voltage side of the circuit.

Ignition ON, use a DC voltage setting DMM to check the reference voltage (usually 5 or 12 volts) from the PCM. To do this, connect the Meter negative lead to ground and the Meter positive lead to the B + sensor terminal on the harness side of the connector. If there is no reference signal, connect a meter set to ohms (ignition off) between the TFL reference terminal and the PCM reference terminal. If the meter reading is out of tolerance (OL), there is an open circuit between the PCM and the sensor that needs to be located and repaired. If the counter reads a numeric value, there is continuity.

If everything is fine up to this point, you will want to check if power is coming out of the PCM. To do this, turn on the ignition and set the meter to constant voltage. Connect the meter positive lead to the PCM reference voltage terminal and the negative lead to ground. If there is no reference voltage from the PCM, the PCM is probably faulty. However, PCMs rarely fail, so it's a good idea to double check your work up to that point.

Check circuit ground

Ignition OFF, use a resistor DMM to check the continuity. Connect a meter between the transmission fluid level sensor ground terminal and chassis ground. If the counter reads a numeric value, there is continuity. If the meter reading is out of tolerance (OL), there is an open circuit between the PCM and the sensor that needs to be located and repaired.

Check the sensor

If everything goes well by this point, the sensor is probably faulty. To test this, turn off the ignition and set the multimeter to read in ohms. Remove the transmission fluid level sensor connector and connect the meter to the sensor terminals. If the meter reading is out of tolerance (OL), the sensor is open from the inside and must be replaced.

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