AutoCodes – Mercury – P1878 Mercury

P1878 Mercury 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 Mercury 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 1,164

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
FAQs
Comments
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Code P1878 Mercury 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 Mercury - Transmission Transfer Case Disengaged Solenoid Circuit Failure - AutoCodes.com — P1878 Mercury Code - Transmission Transfer Case Disengaged Solenoid Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1878 Mercury?

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 Mercury?

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 Mercury 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 P1878 Mercury code?

Need more information on how to fix the P1878 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1878 Mercury code diagnosed by a professional: Find a repair shop in your area

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 P1878 Mercury Code

1. What are common symptoms of OBDII code P1878 in a Mercury vehicle?

- Common symptoms include difficulty shifting gears, unexpected vehicle stalling, and illuminated dashboard warning lights related to the transmission system.

2. What does OBDII code P1878 indicate in a Mercury?

- OBDII code P1878 indicates a Transmission Transfer Case Disengaged Solenoid Circuit Failure in a Mercury vehicle.

3. What are possible causes of OBDII code P1878 in a Mercury?

- Possible causes of OBDII code P1878 include faulty solenoid wiring, a malfunctioning solenoid, corroded connectors, or issues with the transfer case control module.

4. How can I diagnose OBDII code P1878 in my Mercury?

- Diagnosing OBDII code P1878 typically involves using a diagnostic scanner to retrieve the code, inspecting the solenoid circuit components, and testing the solenoid for proper functioning.

5. Can OBDII code P1878 be cleared/reset in a Mercury?

- OBDII code P1878 can be cleared/reset using a diagnostic scanner after the underlying issue has been addressed and repaired in the vehicle.

6. Is it safe to drive my Mercury with OBDII code P1878 present?

- It is not recommended to drive your Mercury with OBDII code P1878 present, as it can lead to further damage to the transmission system and potential safety hazards.

7. How much does it typically cost to repair OBDII code P1878 in a Mercury?

- The cost to repair OBDII code P1878 in a Mercury can vary depending on the specific issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can I fix OBDII code P1878 in my Mercury myself?

- While some experienced DIYers may be able to address simpler causes of OBDII code P1878, it is generally recommended to seek professional help for diagnosing and repairing this issue in a Mercury.

9. Will OBDII code P1878 cause permanent damage to my Mercury if not addressed promptly?

- Ignoring OBDII code P1878 in your Mercury can lead to further transmission problems and potential long-term damage if not addressed promptly by a qualified mechanic.

10. How long does it take to repair OBDII code P1878 in a Mercury?

- The repair time for OBDII code P1878 in a Mercury can vary depending on the specific cause and complexity of the issue, but it may take a few hours to a full day to complete the repair.