What is OBD-II Code P08A3 – Gear Lever Y Position Sensor 2 Circuit Intermittent/Erratic

What is OBD-II Code P08A3 – Gear Lever Y Position Sensor 2 Circuit Intermittent/Erratic

As a mechanic, I often encounter customers who come to me confused and frustrated about their check engine light that will not turn off. Many of them have no idea what the OBD-II Code means or how to repair the issue. One of the most common OBD-II codes that I deal with is P08A3 – Gear Lever Y Position Sensor 2 Circuit Intermittent/Erratic. In this article, I will explain this code, its possible causes, and how to fix the problem.

OBD-II Code P08A3 – Gear Lever Y Position Sensor 2 Circuit Intermittent/Erratic Explained

The gear lever Y position sensor is responsible for detecting the position of the gear lever in an automatic transmission vehicle. When the gear lever is moved, the sensor sends a signal to the transmission control module (TCM) to shift the gears. OBD-II Code P08A3 indicates that the TCM has detected an intermittent or erratic signal from Gear Lever Y Position Sensor 2 Circuit.

Possible Causes of OBD-II Code P08A3

There are several reasons why you might be experiencing OBD-II Code P08A3. Here are some of the most common causes:

1. Defective Gear Lever Y Position Sensor: The most common cause of this error code is a defective Gear Lever Y Position Sensor. The sensor may have malfunctioned or could be damaged due to wear and tear.

2. Corroded Connectors: Corroded connectors in the wiring or in the sensor can also result in OBD-II Code P08A3. Over time, the device may become more susceptible to corrosion, leading to a weak signal that is difficult for the TCM to read.

3. Faulty Wiring: Faulty wiring is another common cause for OBD-II Code P08A3. Damage to the wiring can lead to a lack of continuity, which can result in an erratic signal.

4. Malfunctioning TCM: The transmission control module (TCM) is responsible for receiving signals from the Gear Lever Y Position Sensor. If the TCM is malfunctioning, it can lead to OBD-II Code P08A3.

How to Fix OBD-II Code P08A3

The method of fixing OBD-II Code P08A3 will depend on the underlying cause of the error code. As a mechanic, I would recommend the following steps to fix the problem:

1. Start by checking the Gear Lever Y Position Sensor 2 Circuit for any visible damage or wear and tear. Replace the sensor if you find any signs of damage.

2. Check the connectors for any corrosion or damage. Clean the connectors using a specialized cleaner and replace the connectors if required.

3. Inspect the wiring and look for visible signs of damage. If you find any issues, order a replacement harness and install it.

4. If none of these solutions work, the problem could be with the TCM. You can bring the car to a transmission specialist who can perform a thorough diagnostic test and replace the TCM if required.

Frequently Asked Questions

1. Can I still drive my car with OBD-II Code P08A3?
Driving with OBD-II Code P08A3 is not recommended because it can cause other problems in your car. It can also cause the transmission to slip or not shift properly.

2. How much will it cost me to fix OBD-II Code P08A3?
The cost of fixing OBD-II Code P08A3 varies depending on the underlying cause. It can range from a simple harness replacement to a TCM replacement. It’s best to get an estimate from a trusted mechanic.

3. Can OBD-II Code P08A3 be prevented?
Preventing OBD-II Code P08A3 requires routine maintenance and inspections. Regularly checking the transmission for leaks, inspecting the wiring, and cleaning the connectors can help prevent this error code from occurring.

4. Will OBD-II Code P08A3 damage my car?
OBD-II Code P08A3 won’t necessarily damage your car, but it can lead to other problems such as transmission slipping or shifting issues.

5. How do I reset OBD-II Code P08A3?
Resetting OBD-II Code P08A3 is not recommended until the underlying cause is fixed. Once the problem is resolved, the error code should go away on its own. If it doesn’t, you can clear it using an OBD-II scanner or by disconnecting the battery for a few minutes.


OBD-II Code P08A3 is a common error code that requires attention from a skilled mechanic. The causes of the error code can range from a faulty sensor to a malfunctioning TCM. If you see this error code on your car, it’s important to get it checked out right away to prevent further damage. Routine maintenance and inspections can help prevent this error code from occurring.

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