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P0873 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 3 Circuit High Voltage

Quick Answer

The P0873 diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically relates to the Transmission Fluid Pressure Switch 3 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch 3, Wiring issues or short circuits in the circuit, Low transmission fluid levels. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0873 2017 GMC Sierra indicates Transmission Fluid Pressure Switch 3 Circuit High Voltage.
Common causes
Common causes include Faulty transmission fluid pressure switch 3, Wiring issues or short circuits in the circuit, Low transmission fluid levels.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P0873 2017 GMC Sierra Description

The P0873 diagnostic trouble code (DTC) for a 2017 GMC Sierra specifically relates to the Transmission Fluid Pressure Switch 3 Circuit High Voltage. This code indicates that the transmission control module (TCM) has detected an unusually high voltage in the circuit related to the third transmission fluid pressure switch. In automatic transmissions, these pressure switches are essential for monitoring and regulating hydraulic pressure within the transmission. When the pressure is too high or too low, it can lead to improper shifting, slipping, or harsh engagement, ultimately affecting the vehicle's performance and drivability.

OBDII Code P0873 2017 GMC Sierra - Transmission Fluid Pressure Switch 3 Circuit High Voltage
P0873 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 3 Circuit High Voltage

Common Causes of P0873 2017 GMC Sierra

  1. Faulty transmission fluid pressure switch 3
  2. Wiring issues or short circuits in the circuit
  3. Low transmission fluid levels
  4. Contaminated transmission fluid
  5. Malfunctioning TCM

Symptoms of P0873 2017 GMC Sierra

  1. Erratic shifting behavior
  2. Transmission slipping
  3. Harsh engagement when shifting gears
  4. Delayed or prolonged shifting
  5. Illumination of the Check Engine Light

How to Fix P0873 2017 GMC Sierra

  1. Diagnose the code using a professional diagnostic scan tool to pinpoint the exact cause of the high voltage in the transmission fluid pressure switch 3 circuit.
  2. Inspect the wiring harness and connectors associated with the pressure switch for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Check the transmission fluid level and condition. Top off or replace the fluid if it is low or contaminated.
  4. Test the transmission fluid pressure switch 3 using a multimeter to determine if it is functioning correctly. Replace the switch if it is faulty.
  5. Clear the code from the TCM memory and test drive the vehicle to ensure that the issue has been resolved and the transmission is operating normally.

Cost to Fix P0873 2017 GMC Sierra

The typical repair costs for addressing the P0873 code on a 2017 GMC Sierra may range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the cost of diagnostic time, replacement of the transmission fluid pressure switch 3 if necessary, and any additional repairs or maintenance tasks required to resolve the code. It's important to note that labor rates at auto repair shops can vary significantly, so it's advisable to obtain a detailed quote from a trusted mechanic or dealership before proceeding with the repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0873 2017 GMC Sierra Code

1. What does the OBDII code P0873 mean on a 2017 GMC Sierra?

P0873 indicates that the Transmission Control Module (TCM) has detected a high voltage issue in the Transmission Fluid Pressure Switch 3 Circuit.

2. What are the symptoms of code P0873 on a 2017 GMC Sierra?

Common symptoms include harsh or delayed shifting, the transmission going into limp mode, and the illumination of the check engine light.

3. What causes the P0873 code on a 2017 GMC Sierra?

Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, low or dirty transmission fluid, or a malfunctioning TCM.

4. Can driving with a P0873 code cause further damage?

Yes, driving with this code can lead to further transmission issues or damage, especially if the transmission is in limp mode or shifting improperly.

5. How do you diagnose the P0873 code on a 2017 GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, checking the transmission fluid level and condition, and using a scan tool to monitor the transmission pressure sensor readings.

6. How do you fix the P0873 code on a 2017 GMC Sierra?

Repairs may include replacing the transmission fluid pressure switch, repairing damaged wiring or connectors, performing a transmission fluid change, or reprogramming or replacing the TCM if necessary.

7. Could a low transmission fluid level trigger the P0873 code?

Yes, low transmission fluid can cause inaccurate pressure readings, potentially triggering the P0873 code.

8. How much does it cost to repair the P0873 code on a 2017 GMC Sierra?

The cost varies depending on the issue, ranging from $50 to $200 for simple fixes like wiring repairs or fluid changes, to over $500 if the pressure switch or TCM needs replacement.

9. Can a bad transmission fluid pressure switch cause other transmission problems?

Yes, a faulty switch can lead to incorrect pressure readings, affecting shift timing, gear engagement, and overall transmission performance.

10. Is clearing the P0873 code enough to fix the problem?

No, clearing the code without addressing the underlying issue may result in the code returning and further transmission issues. Always diagnose and repair the root cause.

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