AutoCodes – GMC – P0877 2017 GMC Sierra

P0877 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 4 Circuit Low Voltage

Quick Answer

The Transmission Fluid Pressure (TFP) switch 4 is part of the Transmission Control Solenoid Valve Assembly which has no serviceable parts. 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: P0877 2017 GMC Sierra indicates Transmission Fluid Pressure Switch 4 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 266

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 03, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0877 2017 GMC Sierra Description

The Transmission Fluid Pressure (TFP) switch 4 is part of the Transmission Control Solenoid Valve Assembly which has no serviceable parts. The Transmission Control Module (TCM) supplies a signal circuit to the TFP switch 4. The TFP switch 4 has an internal case ground. TFP switch 4 is normally closed or LOW. When oil pressure is present at the TFP switch 4, the switch is open or HIGH. The normal LOW pressure control solenoid 5 controls pressure to the 1-2-3-4 clutch regulator valve. The TCM monitors the TFP switch 4 to determine the position of the 1-2-3-4 clutch regulator valve. When the 1-2-3-4 clutch is commanded OFF, pressure is present on the TFP switch 4. When the 1-2-3-4 clutch is commanded ON, the 1-2-3-4 clutch regulator valve moves and pressure to the TFP switch 4 is exhausted through the 1-2-3-4 clutch regulator valve. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that the TFP switch 4 signal voltage remains LOW after the 1-2-3-4 clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 5 counts are accumulated.

OBDII Code P0877 2017 GMC Sierra - Transmission Fluid Pressure Switch 4 Circuit Low Voltage - AutoCodes.com — P0877 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 4 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0877 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

How to Fix the DTC P0877 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 P0877 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 P0877 2017 GMC Sierra 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 P0877 2017 GMC Sierra Code

What does the OBDII code P0877 mean for a 2017 GMC Sierra?

1. P0877 indicates a "Transmission Fluid Pressure Switch 4 Circuit Low Voltage," meaning the transmission control module (TCM) has detected an issue with the voltage in the pressure switch 4 circuit. 2.

What are the common symptoms of the P0877 code in a 2017 GMC Sierra?

Symptoms may include erratic shifting, transmission slipping, the vehicle going into limp mode, poor acceleration, or the illumination of the check engine light. 3.

What causes the P0877 code to appear on a GMC Sierra?

Common causes include a faulty transmission fluid pressure switch, damaged or corroded wiring, low transmission fluid levels, or a malfunctioning transmission control module. 4.

Can driving with the P0877 code damage my 2017 GMC Sierra?

Yes, driving with this code may cause further damage to the transmission if the underlying issue isnâ€™t addressed, especially if the transmission fluid is low or contaminated. 5.

How is the P0877 code diagnosed in a GMC Sierra?

A mechanic typically performs a visual inspection of the wiring and connectors, checks the transmission fluid level and condition, tests the pressure switch, and uses a scan tool to monitor live data from the transmission. 6.

What repairs are typically needed for a P0877 code?

Repairs may include replacing the transmission fluid pressure switch, repairing or replacing damaged wiring, cleaning corroded connections, or, in rare cases, replacing the TCM. 7.

Can low transmission fluid cause the P0877 code?

Yes, low or contaminated transmission fluid can cause improper pressure readings, which may trigger the P0877 code. 8.

How much does it cost to fix the P0877 code on a 2017 GMC Sierra?

Repair costs vary but may range from $100 to $400, depending on whether the issue is a simple wiring repair or a replacement of the pressure switch. 9.

Can I clear the P0877 code without fixing the problem?

Clearing the code without addressing the root cause will likely result in the code returning and could lead to further transmission issues. 10.

What tools are needed to troubleshoot the P0877 code in a GMC Sierra?

Tools may include a scan tool capable of reading transmission data, a multimeter for voltage testing, and basic hand tools for inspecting and repairing wiring or components.