The Chevrolet P2161 code is an indication that there is an issue with the Vehicle Speed Sensor (VSS) 2 Circuit. This code is often associated with a loss of speed signal from the transfer case speed sensor as well as a decrease or increase in output speed signal measured in RPM. The transmission is not performing garage shifting, is not in Reverse Inhibit state, and is not in PARK or NEUTRAL when the engine speed is 1000 RPM or greater and there are no crank sensor or P2160 DTCs. It is important to identify and rectify the cause of the P2161 code to prevent further damage to the vehicle.
Causes and Solutions for Chevrolet P2161 Code
| Cause | Solution |
|---|---|
| Loss of speed signal from the transfer case speed sensor | Check the wiring, connection and sensor for faults |
| Output speed signal is increasing: current transfer case speed signal – last valid output speed greater than 475 RPM | Replace the sensor with new one |
| Output speed signal is decreasing: current transfer case speed signal – last valid output speed less than 255 RPM | Clean and lubricate the sensor |
| Transmission is not performing garage shifting | Check the transmission fluid level |
Loss of Speed Signal from the Transfer Case Speed Sensor
The most common cause of the Chevrolet P2161 code is a loss of speed signal from the transfer case speed sensor. This can be caused by faulty wiring, a disconnected connection, or a faulty sensor. To diagnose and repair this issue, first check the wiring, connection, and sensor for any faults.
Output Speed Signal is Increasing
Another cause of the Chevrolet P2161 code is an output speed signal that is increasing. This occurs when the current transfer case speed signal is greater than the last valid output speed signal by more than 475 RPM. The solution in this case is to replace the sensor with a new one.
Output Speed Signal is Decreasing
The third cause of the Chevrolet P2161 code occurs when the current transfer case speed signal is less than the last valid output speed signal by more than 255 RPM. In this case, the solution is to clean and lubricate the sensor.
Transmission is Not Performing Garage Shifting
The final cause of the Chevrolet P2161 code is when the transmission is not performing garage shifting. This can be easily diagnosed by checking the transmission fluid level.
Conclusion
The Chevrolet P2161 code is an indication that something is wrong with the Vehicle Speed Sensor (VSS) 2 Circuit. This code can be caused by a variety of issues, such as a loss of speed signal from the transfer case speed sensor, an increase in output speed signal, or a decrease in output speed signal. Additionally, the transmission may not be performing garage shifting. To fix the issue, it is important to identify and rectify the cause of the Chevrolet P2161 Code to prevent further damage to the vehicle.
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