Chevrolet P0873 Code

The Chevrolet P0873 code is a diagnostic trouble code related to the transmission fluid pressure (TFP) switch of three high-voltage circuits. This code is often set when the transmission control module (TCM) detects that the TFP change three signal voltage remains high after the 2-6 clutch transitions from a low-pressure state to a high-pressure state. Understanding the causes and solutions of this code is essential for vehicle owners, technicians, and mechanics. This article outlines the reasons and solutions for the Chevrolet P0873 code.

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Causes and Solutions for Chevrolet P0873 Code

Causes Solutions
Defective TFP switch 3 Replace the TFP switch 3
Damaged wiring or connectors Inspect, repair, or replace the wiring and connectors
Faulty TCM Replace the TCM
Low voltage to the TCM Check the voltage and replace the TCM if necessary

Defective TFP Switch 3

One of the most common causes of the Chevrolet P0873 code is a defective Transmission Fluid Pressure Switch 3 (TFP switch 3). This switch is responsible for sensing the pressure of the transmission fluid and sending an electrical signal to the Transmission Control Module (TCM). If the button is not functioning correctly, the TCM cannot interpret the call and will set the P0873 code.

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Damaged Wiring or Connectors

Another common cause of the P0873 code is damaged wiring or connectors. This can include frayed or broken wires, improper connections, corroded connectors, or faulty terminals. If the wiring or connectors are damaged, it can prevent the TFP switch three from sending an accurate signal to the TCM.

Faulty TCM

Sometimes, the Transmission Control Module (TCM) may cause the P0873 code. If the TCM is malfunctioning, it can cause the TFP to switch three signals to remain high, thus triggering the code.

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Low Voltage to the TCM

In some cases, the cause of the P0873 code may be a low voltage to the TCM. If the voltage is too low, it can cause the TFP to switch three signal to remain high, thus setting the code.

Conclusion

The Chevrolet P0873 code is a diagnostic trouble code related to the transmission fluid pressure switch 3 circuit high voltage. The code is often set when the Transmission Control Module detects that the TFP switch three signal voltage remains high after the 2-6 clutch transitions from a low-pressure state to a high-pressure state. This article outlined the causes and solutions for the Chevrolet P0873 Code, including a defective TFP switch 3, damaged wiring or connectors, a faulty TCM, and low voltage to the TCM. Taking the time to diagnose and repair the issue will help ensure your vehicle is running smoothly.

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