AutoCodes – Cadillac – P0877 Cadillac

P0877 Cadillac 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 Cadillac 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 2,474

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 Cadillac 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 Cadillac - Transmission Fluid Pressure Switch 4 Circuit Low Voltage - AutoCodes.com — P0877 Cadillac Code - Transmission Fluid Pressure Switch 4 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0877 Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

1. What are the common symptoms of OBDII code P0877 in a Cadillac related to Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

The common symptoms include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission going into limp mode.

2. What are the possible causes of OBDII code P0877 in a Cadillac indicating Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P0877 in my Cadillac for Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

Diagnosing this code typically involves using a scan tool to check for the specific fault code, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure switch for proper operation.

4. Can I continue driving my Cadillac with OBDII code P0877 related to Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the transmission and potentially unsafe driving conditions.

5. How can I repair OBDII code P0877 in my Cadillac for Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

Repairing this code may involve replacing the faulty transmission fluid pressure switch, repairing any damaged wiring or connectors, checking and topping up the transmission fluid levels, or reprogramming the transmission control module.

6. Are there any DIY tips for addressing OBDII code P0877 in a Cadillac indicating Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

While some basic diagnostics can be done at home, it is recommended to have a professional technician perform a thorough inspection and repair to ensure the issue is properly addressed.

7. How much does it typically cost to fix OBDII code P0877 related to Transmission Fluid Pressure Switch 4 Circuit Low Voltage in a Cadillac?

The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred dollars for a simple fix to over a thousand dollars for more complex repairs.

8. Can OBDII code P0877 in a Cadillac be intermittent or sporadic?

Yes, this code can sometimes be triggered intermittently, especially if the issue is related to a loose connection or intermittent fault in the transmission fluid pressure switch circuit.

9. Is it necessary to reset the OBDII system after repairing OBDII code P0877 in a Cadillac for Transmission Fluid Pressure Switch 4 Circuit Low Voltage?

Yes, it is recommended to reset the OBDII system after making any repairs to clear the fault code and ensure the issue has been properly resolved.

10. How can regular maintenance help prevent OBDII code P0877 related to Transmission Fluid Pressure Switch 4 Circuit Low Voltage in a Cadillac?

Regular transmission fluid checks, servicing, and inspections can help prevent issues like low transmission fluid levels or faulty pressure switches that can trigger this OBDII code.