OBD-II Trouble Code Technical Description
The transmission friction element G is stuck on.
What does that mean?
This is a generic powertrain diagnostic trouble code (DTC) that typically applies to OBD-II vehicles with automatic transmissions. This includes vehicles from Chevrolet, GMC, Toyota, VW, Ford, Honda, Dodge, Chrysler, etc. Although it is a generic code, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.
The description of “transmission friction element” is quite vague considering the mechanical operation of an automatic transmission (A/T) involves numerous friction elements. Additionally, manual transmissions also use similar friction materials, such as clutches.
In this case, it is suspected that we are referring to an A/T. The symptoms and causes can vary significantly depending on various factors, but it is important to consider the overall health of the automatic transmission and the ATF (Automatic Transmission Fluid) as the first step.
Problems with internal friction materials in the A/T are likely to cause erratic driving conditions, such as shift timing and torque output issues, among other consequences. Factors like abnormally paired tires or inadequately inflated tires can cause internal slippage due to their unsymmetrical circumstances. Therefore, it is important to keep this in mind when assessing the functionality of the drivetrain and troubleshooting any faults. If you have recently installed a used tire, make sure it is the same size as the others and check the tire’s sidewall for verification. Minor differences can sometimes cause indirect issues like this.
Photo and cutaway of an automatic transmission:
When the ECM (Engine Control Module) activates this P07AF code and related codes, it proactively monitors and adjusts other sensors and systems to ensure proper self-diagnosis. Therefore, it is important to address this issue before it potentially leads to further problems. It may be a simple fix, but it could also be a complex internal electrical malfunction, such as a short, open circuit, or water intrusion. Seek appropriate help to avoid costly mistakes, even professionals can overlook certain things.
In this case, the letter “G” may refer to a specific circuit/wire or a specific friction element within the transmission. Always refer to your service manual for specific locations, distinctions, and other specifications.
What is the severity of this DTC?
As mentioned earlier, it is not advisable to leave this issue unattended, especially if you are actively using the vehicle with the fault(s) present. It should be prioritized, especially if you rely on the vehicle for daily transportation.
What are some of the symptoms of the code?
Symptoms of a P07AF trouble code may include:
What are some of the common causes of the code?
Causes for this P07AF friction element slip code may include:
What are some P07AF troubleshooting steps?
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins for known issues with the specific vehicle.
Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle.
Basic Step #1
It is crucial to follow basic maintenance procedures for the transmission’s health. Start by checking the cleanliness and debris-free condition of the ATF (Automatic Transmission Fluid). It is also important to adhere to proper maintenance schedules to prevent future faults. If you cannot remember the last time the transmission was serviced (i.e. filter+fluid+gasket), it is recommended to perform this service before proceeding. There may be debris trapped internally in the oil, and a simple service might resolve the issue. Make sure you are using the correct ATF for your specific make and model.
Basic Step #2
When trying to locate the connector/harness for this system, you will likely need to find a junction connector. There may be one “master” connector, so refer to your manual to ensure you are working with the correct one. Ensure that the connector is properly seated to establish a good electrical connection. The location of the connector on the A/T may subject it to vibrations that could loosen connections or cause physical damage. Additionally, there is a possibility of ATF saturating connectors and wires, leading to present or future issues.
Basic Step #3
It is always wise to consider the overall condition of your vehicle, as other systems can directly affect the transmission and vice versa. Uneven tires, worn-out suspension parts, and incorrect wheels can cause issues in this system and possibly others. Therefore, it is important to address any imbalances to potentially resolve this code.
This article is strictly for informational purposes, and the technical data and service bulletins specific to your vehicle should always take precedence.
