What is OBD-II Code P07A5 – Transmission Friction Element B Stuck On

Transmission Friction Element B Stuck On – An Explanation of OBD-II Code P07A5

As a mechanic, it is crucial to understand and explain to our customers the significance of OBD-II codes, as they can provide valuable insights into the operation of a vehicle. In this article, we will focus on OBD-II Code P07A5 – Transmission Friction Element B Stuck On, and provide a comprehensive explanation of what it means and how to repair it.

Understanding OBD-II Codes

Before we delve into the specifics of P07A5, let’s first understand what OBD-II codes are. OBD-II (On-Board Diagnostics) is a computer-based system that monitors a vehicle’s performance and identifies any issues or malfunctions.

When a problem occurs, the OBD-II system records a fault code. These codes are alphanumeric and standardized across vehicles and manufacturers, allowing for easy diagnosis and repair. Some codes are generic, while others are specific to a manufacturer or model.

P07A5 is a generic code, which means it applies to all vehicles equipped with an OBD-II system.

What Is P07A5 – Transmission Friction Element B Stuck On?

P07A5 refers to a fault in the transmission’s torque converter clutch friction element B. The torque converter is a fluid coupling device that transfers power from the engine to the transmission. The friction element B controls the torque converter lockup, which improves fuel efficiency and reduces transmission heat build-up.

When the friction element B is stuck on, the torque converter clutch remains engaged, even when the vehicle is at a stop. This can cause several problems, such as increased heat build-up, decreased fuel efficiency, and premature wear and tear on the transmission.

Symptoms of P07A5

Several symptoms can indicate a fault with the transmission friction element B:

1. Engine Misfiring – A faulty transmission can cause the engine to misfire, leading to poor performance and decreased fuel efficiency.

2. Transmission Overheating – A stuck-on friction element B causes increased heat build-up in the transmission, leading to overheating and potential damage.

3. Poor Shifting – A faulty torque converter clutch can cause the vehicle to shift erratically or delay between gear changes, leading to decreased performance and safety.

4. Poor Acceleration – A faulty torque converter clutch can cause the vehicle to experience poor acceleration, resulting in slower take-off and reduced performance.

Repairing P07A5

When diagnosing and repairing P07A5, several steps are involved:

1. Diagnostic Process – The first step is to use a scanner tool to read the OBD-II codes to determine that P07A5 is present. The next step is to examine the torque converter clutch and friction element B for wear or damage.

2. Repairs – The most common repair for P07A5 is to replace the torque converter and friction element B. In some cases, the entire transmission may need to be replaced.

3. Final Diagnosis – Once the repairs are made, the vehicle is tested to ensure that the issue is resolved and there are no other fault codes present.

Frequently Asked Questions

1. Can I still drive with P07A5?

It is not recommended to drive with P07A5, as the torque converter clutch can cause severe damage to the transmission, leading to costly repairs.

2. What causes P07A5?

P07A5 is often caused by a worn or damaged friction element B, resulting in the torque converter clutch remaining engaged.

3. How much does it cost to repair P07A5?

The cost of repairing P07A5 can vary depending on the extent of the damage, but it typically ranges from $500 to $2,000.

4. How long does it take to repair P07A5?

The duration of the repair can vary depending on the extent of the damage and the required repairs. It typically takes between 4 and 6 hours to repair P07A5, but it can take longer if the transmission needs to be replaced.

5. How can I prevent P07A5?

To prevent P07A5, it is essential to follow the manufacturer’s recommended maintenance schedule, including regular fluid changes and inspections.


OBD-II codes such as P07A5 can provide valuable insight into a vehicle’s operation and identify potential issues before they become major problems. By understanding the significance of these codes and performing timely repairs, we can ensure the longevity and performance of our vehicles.

Additional Resources

– Transmission Torque Converter: What is it, How it Works and How to Fix it
– Understanding Transmission Diagnosis
– How to Choose the Right Transmission Shop for Your Vehicle

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