Technical Description of OBD-II Trouble Code
Excessive Transmission Fluid Level
What does that indicate?
This generic powertrain diagnostic trouble code (DTC) typically applies to OBD-II equipped vehicles that are equipped with a transmission fluid level sensor. This may include vehicles from GM, Chevrolet, Ford, Dodge, Ram, Toyota, Hyundai, and others. However, this code is not commonly encountered.
If you have the P075F code, it is likely that your vehicle has a transmission fluid level (TFL) sensor. This sensor is used to determine the level of transmission fluid inside the transmission, as an improper level can cause damage to the transmission.
TFL sensors receive a reference voltage from the PCM. The PCM monitors the circuit and when it detects that the level is too high and out of range, it sets this DTC and illuminates the check engine light or transmission warning light to alert the driver.
Code P075F is triggered when the PCM detects that the transmission fluid level is too high. Other related codes include P070A, P070B, P070C, P070D, P070E, and P070F.
Severity of the Code & Symptoms
This transmission code is considered to have a moderate to severe severity. If left unaddressed, a high transmission fluid level can potentially cause damage to the transmission. It is recommended to address this code as soon as possible.
Symptoms of a P075F trouble code may include:
Common Causes of this DTC Code
Possible causes for this P075F transmission fluid level code may include:
Diagnostic and Repair Procedures
Begin by checking the transmission fluid level and condition according to the manufacturer’s recommendations. Next, inspect the transmission fluid level sensor and its corresponding wiring. Look for loose connections, damaged wiring, etc. If any damage is found, repair it as necessary, clear the code, and observe if it returns. Additionally, check for any technical service bulletins (TSBs) related to this issue. If no relevant information is found, proceed with a step-by-step diagnosis of the system.
The following is a general procedure, as the testing for this code may vary between vehicles. For accurate testing, it is recommended to refer to the manufacturer’s diagnostic flow chart.
Check the Wiring
Prior to proceeding, consult the factory wiring diagrams to determine the identification of the wires. 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 the 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 the 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 needs to be located and repaired. If the meter reads a numeric value, there is continuity.
If everything is functioning properly up to this point, 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 no reference voltage from the PCM, the PCM is likely faulty. However, PCM failures are rare, so it is advisable to double-check the previous steps.
Check the Ground Side of the Circuit
With the ignition off, use a digital multimeter set to ohms to check for continuity. Connect the meter between the transmission fluid level sensor ground terminal and chassis ground. If the meter reads a numeric value, there is continuity. If the meter reads “out of limits” (OL), there is an open circuit between the PCM and sensor that needs to be located and repaired.
Check the Sensor
If everything checks out up to this point, it is likely that the sensor itself is faulty. To check this, turn the ignition off and set the multimeter to read ohms. Remove the transmission fluid level sensor connector and connect the meter to the sensor terminals. If the meter reads “out of limits” (OL), the sensor is internally open and should be replaced.
