AutoCodes – Chevrolet – P0878 2015 Chevrolet Silverado

P0878 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 4 Circuit High 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: P0878 2015 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 4 Circuit High 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 409

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 03, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0878 2015 Chevrolet Silverado 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 HIGH after the 1-2-3-4 clutch transitions from a LOW pressure state to a HIGH pressure state. The TCM counts each incident. The DTC sets when 8 counts are accumulated.

OBDII Code P0878 2015 Chevrolet Silverado - Transmission Fluid Pressure Switch 4 Circuit High Voltage - AutoCodes.com — P0878 2015 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 4 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0878 2015 Chevrolet Silverado?

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 P0878 2015 Chevrolet Silverado?

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 P0878 2015 Chevrolet Silverado 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 P0878 2015 Chevrolet Silverado code?

Need more information on how to fix the P0878 2015 Chevrolet Silverado 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 P0878 2015 Chevrolet Silverado Code

1. What does the OBDII code P0878 mean on a 2015 Chevrolet Silverado?

The code P0878 indicates a high voltage issue in the Transmission Fluid Pressure Switch 4 Circuit, which monitors hydraulic pressure in the transmission.

2. What are the common symptoms of a P0878 code?

Symptoms may include erratic shifting, the transmission being stuck in one gear, reduced performance, or the check engine light being illuminated.

3. What causes the P0878 code in a 2015 Chevrolet Silverado?

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

4. Can driving with a P0878 code damage my transmission?

Yes, driving with this code for an extended period can lead to further transmission damage due to improper hydraulic pressure regulation.

5. How do I diagnose the P0878 code?

Start by checking the transmission fluid level and condition, inspect the wiring and connectors for damage, and use a multimeter to test the transmission fluid pressure sensor and circuit.

6. How is the P0878 code fixed?

Repairs may involve replacing the transmission fluid pressure sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.

7. Can low transmission fluid cause the P0878 code?

Yes, low or contaminated transmission fluid can lead to improper pressure readings, which may trigger this code.

8. How much does it cost to fix a P0878 code on a 2015 Silverado?

The repair cost varies but may range from $100-$300 for sensor replacement and up to $1,000 if TCM repairs or replacements are needed. Diagnostics costs are additional.

9. Is the P0878 code specific to the 2015 Chevrolet Silverado?

No, the code can appear on other vehicles with OBDII systems, but the exact causes and symptoms may vary depending on the make and model.

10. Can I clear the P0878 code without fixing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning and may cause further damage to the transmission.