AutoCodes – GMC – P0877 2015 GMC Sierra

P0877 2015 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 2015 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 291

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 2015 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 2015 GMC Sierra - Transmission Fluid Pressure Switch 4 Circuit Low Voltage - AutoCodes.com — P0877 2015 GMC Sierra Code - Transmission Fluid Pressure Switch 4 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0877 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the P0877 2015 GMC Sierra 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 P0877 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P0877 in a 2015 GMC Sierra?

The common symptoms of OBDII code P0877 include harsh shifting, transmission slippage, and the transmission being stuck in a single gear.

2. What is the primary cause of OBDII code P0877 in a 2015 GMC Sierra?

The primary cause of OBDII code P0877 is a malfunction in the transmission fluid pressure switch 4 circuit, leading to low voltage being detected by the vehicle's onboard diagnostic system.

3. How can I diagnose the issue causing OBDII code P0877 in my 2015 GMC Sierra?

Diagnosing the issue causing OBDII code P0877 involves checking the wiring and connections related to the transmission fluid pressure switch 4 circuit, as well as testing the switch itself for proper functionality.

4. Can driving with OBDII code P0877 in a 2015 GMC Sierra cause further damage to the vehicle?

Continuing to drive with OBDII code P0877 in a 2015 GMC Sierra can potentially cause damage to the transmission due to improper fluid pressure regulation, leading to more severe transmission issues over time.

5. How can I repair OBDII code P0877 in a 2015 GMC Sierra?

Repairing OBDII code P0877 involves addressing the root cause of the low voltage detected in the transmission fluid pressure switch 4 circuit, which may require repairing or replacing the switch, checking and repairing any damaged wiring, or addressing faulty connections.

6. Is it safe to continue driving my 2015 GMC Sierra with OBDII code P0877 present?

It is not recommended to continue driving your 2015 GMC Sierra with OBDII code P0877 present, as it can lead to further transmission problems and potential safety hazards on the road.

7. Can I reset OBDII code P0877 in my 2015 GMC Sierra by disconnecting the battery?

While disconnecting the battery may clear the code temporarily, it will not solve the underlying issue causing OBDII code P0877. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

8. How much does it typically cost to repair OBDII code P0877 in a 2015 GMC Sierra?

The cost to repair OBDII code P0877 in a 2015 GMC Sierra can vary depending on the exact cause of the issue, but it may involve labor costs for diagnosis and repair, as well as potential parts replacement.

9. Can a DIY enthusiast fix OBDII code P0877 in a 2015 GMC Sierra?

While some DIY enthusiasts may have the skills and tools to address OBDII code P0877, it is recommended to consult a professional mechanic or technician for proper diagnosis and repair to ensure the issue is resolved correctly.

10. Will OBDII code P0877 cause my 2015 GMC Sierra to go into limp mode?

In some cases, OBDII code P0877 in a 2015 GMC Sierra can trigger the vehicle's transmission control module to activate limp mode to protect the transmission from further damage due to the detected low voltage in the pressure switch circuit.