AutoCodes – Chevrolet – P0873 2015 Chevrolet Silverado

P0873 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 3 Circuit High Voltage

Quick Answer

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly. 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 2015 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 3 Circuit High Voltage.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly.
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.

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Code Popularity 284

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0873 2015 Chevrolet Silverado Description

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. Pressure switch 1 monitors shift valve 1 positioning, pressure switch 2 monitors shift valve 2 positioning, pressure switch 3 monitors shift valve 3 positioning, and pressure switch 4 monitors the position of the manual selector valve. The TCM provides a signal circuit to each of the pressure switches. The TCM constantly monitors the circuits to determine the position of the shift valves. The position of shift valves 1, 2, and 3 is controlled by 3 normally closed shift solenoids. When energized, shift solenoid 1 directs fluid pressure to shift valve 1, shift solenoid 2 directs fluid pressure to shift valve 2, and shift solenoid 3 directs fluid pressure to shift valve 3, which strokes the shift valves. When a shift valve is stroked, an exhaust passage is blocked and fluid pressure increases, closing the normally open pressure switch. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that transmission fluid pressure switch 3 signal circuit is High when shift solenoid 3 is commanded ON for 1 s.

OBDII Code P0873 2015 Chevrolet Silverado - Transmission Fluid Pressure Switch 3 Circuit High Voltage - AutoCodes.com — P0873 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0873 2015 Chevrolet Silverado?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve Assembly
Transmission Control Solenoid Valve Assembly harness is open or shorted
Transmission Control Solenoid Valve Assembly circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P0873 2015 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0873 2015 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0873 2015 Chevrolet Silverado code?

Need more information on how to fix the P0873 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2015 Chevrolet Silverado Code

1. What does the OBDII code P0873 mean on a 2015 Chevrolet Silverado?

P0873 indicates a high voltage issue in the Transmission Fluid Pressure (TFP) Switch 3 Circuit, which monitors hydraulic pressure in the transmission.

2. What are the common symptoms of code P0873 in a 2015 Chevrolet Silverado?

Symptoms include harsh or delayed shifting, transmission slipping, failure to shift gears, and possible activation of limp mode.

3. What causes the P0873 code to appear in a 2015 Chevrolet Silverado?

Common causes include a faulty pressure switch, damaged wiring or connectors, low or contaminated transmission fluid, or an internal transmission problem.

4. Can I drive my 2015 Chevrolet Silverado with the P0873 code?

It is not recommended to drive with this code, as it may cause further transmission damage or leave the vehicle stuck in limp mode.

5. How do I diagnose the P0873 code on my 2015 Chevrolet Silverado?

Check the transmission fluid level and condition, inspect wiring and connectors for damage, and use a scan tool to monitor the TFP switch voltage and pressure readings.

6. How can I fix the P0873 code on my 2015 Chevrolet Silverado?

Repairs may include replacing the faulty pressure switch, repairing damaged wiring, flushing and refilling transmission fluid, or addressing internal transmission issues.

7. What tools are needed to troubleshoot the P0873 code?

Youâ€™ll need a scan tool capable of reading transmission data, a multimeter for testing electrical circuits, and possibly transmission fluid service tools.

8. How much does it cost to fix the P0873 code on a 2015 Chevrolet Silverado?

Repair costs can vary widely, from $100â€“$300 for minor repairs like wiring or switch replacement to $1,000+ for more extensive transmission work.

9. Can low transmission fluid cause the P0873 code?

Yes, low or contaminated transmission fluid can trigger the P0873 code by affecting hydraulic pressure and switch operation.

10. What happens if the P0873 code is ignored?

Ignoring this code can lead to severe transmission damage, poor vehicle performance, and costly repairs if the underlying issue is not resolved promptly.