AutoCodes – GMC – P0877 2014 GMC Sierra

P0877 2014 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 2014 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 256

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 2014 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 2014 GMC Sierra - Transmission Fluid Pressure Switch 4 Circuit Low Voltage - AutoCodes.com — P0877 2014 GMC Sierra Code - Transmission Fluid Pressure Switch 4 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0877 2014 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 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P0877 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P0877 mean on a 2014 GMC Sierra?

Code P0877 indicates that the transmission control module (TCM) has detected a low voltage condition in the transmission fluid pressure switch 4 circuit.

2. What are the common symptoms of a P0877 code in a 2014 GMC Sierra?

Symptoms may include harsh or erratic shifting, transmission slipping, failure to engage certain gears, and activation of the check engine light.

3. What causes the P0877 code on a GMC Sierra?

Common causes include a faulty transmission fluid pressure sensor, damaged wiring or connectors in the circuit, low transmission fluid levels, or a malfunctioning transmission control module (TCM).

4. Can low transmission fluid trigger the P0877 code?

Yes, low transmission fluid can cause insufficient pressure, leading to the P0877 code being triggered.

5. How do you diagnose the P0877 code on a 2014 GMC Sierra?

Diagnosing involves checking the transmission fluid level and condition, inspecting the wiring and connectors in the circuit, testing the pressure sensor, and scanning the TCM for additional codes.

6. Is it safe to drive with a P0877 code on a GMC Sierra?

Driving with a P0877 code is not recommended, as it can lead to further transmission damage and unsafe driving conditions due to erratic shifting.

7. How do you fix a P0877 code on a 2014 GMC Sierra?

Repairs may include replacing the transmission fluid pressure sensor, repairing or replacing damaged wiring or connectors, refilling or flushing the transmission fluid, or reprogramming the TCM.

8. How much does it cost to repair a P0877 code on a GMC Sierra?

Repair costs can range from $100 to $500 or more, depending on whether the issue is with the sensor, wiring, or TCM, and labor rates in your area.

9. Can a faulty TCM cause the P0877 code?

Yes, a malfunctioning transmission control module can fail to properly regulate the pressure circuit, leading to the P0877 code.

10. Will clearing the code fix the P0877 issue on a GMC Sierra?

Clearing the code without addressing the root cause will not fix the problem, and the code is likely to return. Proper diagnosis and repair are required.