P075F Transmission Fluid Level Too High Trouble Code

P075F Transmission Fluid Level Too High

OBD-II Trouble Code Technical Description

Transmission Fluid Level Too High

What does that mean?

This generic powertrain diagnostic trouble code (DTC) typically applies to OBD-II equipped vehicles that have a transmission fluid level sensor. Makes of vehicles may include but are not limited to GM, Chevrolet, Ford, Dodge, Ram, Toyota, Hyundai, etc. This code is uncommon.

If you have this P075F code, then most likely your vehicle has a transmission fluid level (TFL) sensor. It is used to determine the transmission fluid level inside the transmission because having an improper level can be damaging to the transmission.

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

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

Code Severity & Symptoms

The severity of this transmission code is moderate to severe. In some cases, a high transmission fluid level when left unattended, can result in transmission damage. It's a good idea to address this code as soon as possible.

Symptoms of a P075F trouble code may include:

Illuminated transmission warning light Illuminated check engine light Transmission performance problems

Common Causes Of This DTC Code

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

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

Diagnostic and Repair Procedures

Begin by checking the transmission fluid level and condition in accordance with the manufacturer recommendations. Next, inspect the transmission fluid level sensor and the corresponding wiring. Look for loose connections, damaged wiring, etc. If damage is found, repair as necessary, clear the code and see if it returns. Next, check for technical service bulletins (TSBs) regarding the issue. If nothing is found, you will need to move forward to step by step diagnosis of the system.

The following is a generalized procedure, as testing for this code varies between vehicles. To accurately test the system, you'll want to refer to the manufacture's diagnostic flow chart.

Check The Wiring

Before proceeding, you'll want to consult the factory wiring diagrams to determine which wires are which. Autozone offers free online repair manuals for many vehicles and ALLDATA offers single vehicle subscriptions.

Check the reference voltage side of the circuit

With the ignition on, use a digital multimeter set to DC volts to check for reference voltage (usually 5 or 12 volts) from the PCM. To do this, connect the negative meter lead to ground and the positive meter lead to the sensor B+ terminal on harness side of the connector. If no reference signal is present, connect the meter set to ohms (with the ignition off) between the reference voltage pin on the TFL and the reference voltage pin on the PCM. If the meter reads out of limits (OL) there is an open circuit between the PCM and sensor that will need to be located and repaired. If the meter reads a numeric value, there is continuity.

If everything is good up to this point, you'll want to check that there is power coming out of the PCM. To do this, turn the ignition on and set the meter to DC volts. Connect the positive meter lead to the reference voltage terminal on the PCM and the negative lead to ground. If there is not a reference voltage from the PCM, the PCM is probably faulty. However, PCMs rarely go bad, so it's a good idea to double check your work up to this point.