What is OBD-II Code P07B2 – Transmission Park Position Sensor/Switch A Circuit/Open

What Is OBD-II Code P07B2 – Transmission Park Position Sensor/Switch A Circuit/Open

OBD-II (On-Board Diagnostics, version II) codes are a crucial aspect of vehicle diagnosis, maintenance, and repair. These codes exist to help mechanics and vehicle owners alike identify and rectify issues in a timely and efficient manner. As a mechanic, one of the most pressing issues you may come across is OBD-II Code P07B2 – Transmission Park Position Sensor/Switch A Circuit/Open. In this article, we will explain what this code means and how to repair the underlying issue.

Understanding OBD-II Code P07B2

OBD-II Code P07B2 refers to an issue with the transmission park position sensor or switch. Specifically, it indicates an “open” circuit within the “A” switch or sensor. This code can arise in automatic and semi-automatic vehicles only as manual transmissions do not have a park position sensor.

The park position sensor/switch is an essential component of the vehicle’s transmission system, and it plays a vital role in the safe operation of your car. Its primary purpose is to notify the vehicle’s system when the transmission is shifted into park, and the vehicle’s wheels are stopped.

An open circuit in the park position sensor/switch indicates a problem within the sensor/switch itself, the wiring, or the transmission control module. Without this sensor, the vehicle’s system will not register when the gears are in park, which could lead to issues such as rollaway incidents or the inability to start the car.

How to Repair OBD-II Code P07B2

Repairing OBD-II Code P07B2 depends on the root cause of the issue. Below are some possible ways to rectify the code:

1. Replace the Park Position Sensor/Switch

One of the most common causes of OBD-II Code P07B2 is a faulty or damaged park position sensor/switch. In this case, replacing the sensor or switch may be the best option. Start by locating the sensor on the transmission, removing it from the transmission, and disconnecting its electrical connector. Install the new sensor, reconnect the electrical connector, and test the system to ensure that the issue has been resolved.

2. Check and Repair the Wiring

If replacing the park position sensor/switch does not fix the issue, the problem could be associated with a wiring problem. Thus, you need to verify the wire from the transmission control module to the park position sensor/switch. Check for any loose connections or damaged wiring and repair as needed.

3. Check and Repair the Transmission Control Module

If neither of the above steps solves the issue, more complex underlying problems may be present. In this case, inspect the transmission control module to ensure it is properly functioning. It is also advisable to conduct a thorough diagnosis of the transmission and its systems to establish the root cause of the code.

When faced with a P07B2 code, the best course of action is to consult with an experienced mechanic who can diagnose the issue and recommend the most appropriate steps forward.

Frequently Asked Questions (FAQs)

1. Why is my car still showing OBD-II Code P07B2 even after replacing the park position sensor/switch?

If you’ve already replaced the sensor/switch and the code is still present, it could be further upstream with the wiring or the transmission control module. An experienced mechanic can perform further diagnostics to identify and rectify the issue.

2. How can I prevent OBD-II Code P07B2?

Preventative maintenance can go a long way in reducing the chances of receiving this code. Ensure the park position sensor/switch is inspected regularly and replaced every 80,000 miles or as indicated by the manufacturer.

3. Can I ignore OBD-II Code P07B2?

No, this code should not be ignored as it can lead to serious safety issues or even total vehicle immobilization. Seek the services of an expert mechanic to diagnose and resolve the issue promptly.

4. Can a DIYer resolve OBD-II Code P07B2?

This code requires advanced knowledge and expertise to diagnose and repair, so it is not recommended for inexperienced DIYers. Seek the services of a mechanic with the appropriate qualifications and tools.

5. How much does it cost to repair OBD-II Code P07B2?

Repairing OBD-II Code P07B2 can involve anything from replacing the park position sensor/switch to thorough transmission diagnosis, so pricing varies depending on the cause of the code. Contact a reputable mechanic for more information.


OBD-II Code P07B2 is a crucial aspect of ensuring your vehicle’s transmission system’s optimal functioning. By understanding the code and how to repair it, vehicle owners and mechanics can identify and correct issues before they escalate into more significant problems. Remember to prioritize regular maintenance and seek the services of an experienced mechanic if you experience any issues.

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