AutoCodes – Ford – P1878 Ford

P1878 Ford Code - Transmission Transfer Case Disengaged Solenoid Circuit Failure

Quick Answer

The Transmission Control Module (TCM) monitors the Transmission Transfer Case Disengaged Solenoid. Common causes include Faulty Transmission Transfer Case Disengaged Solenoid, Transmission Transfer Case Disengaged Solenoid harness is open or shorted, Transmission Transfer Case Disengaged Solenoid circuit poor electrical connection. 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: P1878 Ford indicates Transmission Transfer Case Disengaged Solenoid Circuit Failure.
Common causes: Common causes include Faulty Transmission Transfer Case Disengaged Solenoid, Transmission Transfer Case Disengaged Solenoid harness is open or shorted, Transmission Transfer Case Disengaged Solenoid circuit poor electrical connection.
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 8,550

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 Feb 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1878 Ford Description

The Transmission Control Module (TCM) monitors the Transmission Transfer Case Disengaged Solenoid. The TCM sets the OBDII code when the Transmission Transfer Case Disengaged Solenoid is not to factory specifications.

OBDII Code P1878 Ford - Transmission Transfer Case Disengaged Solenoid Circuit Failure - AutoCodes.com — P1878 Ford Code - Transmission Transfer Case Disengaged Solenoid Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1878 Ford?

Faulty Transmission Transfer Case Disengaged Solenoid
Transmission Transfer Case Disengaged Solenoid harness is open or shorted
Transmission Transfer Case Disengaged Solenoid circuit poor electrical connection

How to Fix the DTC P1878 Ford?

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 P1878 Ford 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.