AutoCodes – GMC – P0872 2017 GMC Sierra

P0872 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 3 Circuit Low 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: P0872 2017 GMC Sierra indicates Transmission Fluid Pressure Switch 3 Circuit Low 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 301

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 P0872 2017 GMC Sierra 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 pressure switch 3 is Low when shift solenoid valve 3 is commanded OFF for 1 s.

OBDII Code P0872 2017 GMC Sierra - Transmission Fluid Pressure Switch 3 Circuit Low Voltage - AutoCodes.com — P0872 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0872 2017 GMC Sierra?

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 P0872 2017 GMC Sierra?

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 P0872 2017 GMC Sierra 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 P0872 2017 GMC Sierra code?

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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 P0872 2017 GMC Sierra Code

1. What are common symptoms of OBDII code P0872 on a 2017 GMC Sierra?

Common symptoms include harsh shifting, transmission slippage, transmission overheating, and illuminated warning lights on the dashboard.

2. What does the OBDII code P0872 indicate for a 2017 GMC Sierra?

P0872 indicates a Transmission Fluid Pressure Switch 3 Circuit Low Voltage issue in the vehicle's transmission system.

3. What are possible causes of OBDII code P0872 in a 2017 GMC Sierra?

Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, low transmission fluid levels, or internal transmission problems.

4. How can I diagnose the OBDII code P0872 in my 2017 GMC Sierra?

Diagnosis involves using a scan tool to read the code, inspecting the transmission fluid level and condition, checking the wiring and connectors related to the pressure switch, and performing a thorough transmission system inspection.

5. Can I continue to drive my 2017 GMC Sierra with OBDII code P0872?

It is not recommended to drive the vehicle with this code present, as it can lead to further transmission damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair OBDII code P0872 in my 2017 GMC Sierra?

Repair options may include replacing the faulty transmission fluid pressure switch, repairing damaged wiring or connectors, ensuring proper transmission fluid levels, and addressing any internal transmission issues as needed.

7. Is it safe to reset the OBDII code P0872 in my 2017 GMC Sierra without fixing the underlying issue?

Resetting the code without addressing the root cause is not advisable, as the problem will likely reoccur, potentially causing more severe transmission issues down the line.

8. Can a DIY enthusiast fix OBDII code P0872 in a 2017 GMC Sierra?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address simpler causes of P0872, such as checking and replacing the transmission fluid pressure switch. However, complex issues may require professional assistance.

9. How much does it cost to repair OBDII code P0872 in a 2017 GMC Sierra?

Repair costs can vary widely depending on the specific cause of the code and whether parts need to be replaced or additional transmission work is required. It's recommended to obtain quotes from reputable mechanics or service centers.

10. How can I prevent OBDII code P0872 from occurring in my 2017 GMC Sierra in the future?

Regular maintenance, including checking and changing transmission fluid as recommended, monitoring for any signs of transmission issues, and addressing problems promptly, can help prevent the recurrence of P0872 and other related codes.