AutoCodes – Lincoln – P1857 Lincoln

P1857 Lincoln Code - Transfer Case Contact Plate 'C' Short Circuit To Ground

Quick Answer

The Mode Select Switch (MSS) communicates the operator's choice to the Transfer Case Control Module (TCCM). Common causes include Faulty Transfer Case Control Module (TCCM), Transfer Case Control Module harness is open or shorted, Transfer Case Control Module 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: P1857 Lincoln indicates Transfer Case Contact Plate 'C' Short Circuit To Ground.
Common causes: Common causes include Faulty Transfer Case Control Module (TCCM), Transfer Case Control Module harness is open or shorted, Transfer Case Control Module 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 1,307

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 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1857 Lincoln Description

The Mode Select Switch (MSS) communicates the operator's choice to the Transfer Case Control Module (TCCM). As the TCCM commands the gearmotor encoder assembly to 4H mode, the transfer case shift fork moves to engage 4H mode which also engages the dual-cone synchronizers to bring the front driveline to the same speed as the rear driveline. The TCCM also activates the hublock vacuum solenoid, providing a vacuum and engaging the Constant Vacuum Hublock (CVH) at each front wheel. If the vehicle is not responding to the operator's intentions, systematically check the necessary inputs and outputs of the TCCM, components of the transfer case, CVH components, and axle shafts. Check all circuits for opens and shorts to power or ground.

OBDII Code P1857 Lincoln - Transfer Case Contact Plate 'C' Short Circuit To Ground - AutoCodes.com — P1857 Lincoln Code - Transfer Case Contact Plate 'C' Short Circuit To Ground

What does this mean?

What are the Possible Causes of the DTC P1857 Lincoln?

Faulty Transfer Case Control Module (TCCM)
Transfer Case Control Module harness is open or shorted
Transfer Case Control Module circuit poor electrical connection
Faulty Transfer case
Faulty Front axle assembly

How to Fix the DTC P1857 Lincoln?

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 P1857 Lincoln 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 P1857 Lincoln Code

What does the OBDII code P1857 mean for a Lincoln vehicle?

P1857 indicates a short circuit to ground in the Transfer Case Contact Plate 'C,' which is part of the transfer case system responsible for controlling power distribution between the front and rear wheels.

What are the common symptoms of the P1857 code in a Lincoln?

Symptoms may include the 4WD system malfunctioning, difficulty shifting into or out of 4WD modes, warning lights on the dashboard (such as the Check Engine or 4WD light), and reduced overall drivetrain performance.

What causes the P1857 code to appear?

The most common causes are damaged wiring, a failed contact plate, corrosion in electrical connectors, or a short circuit in the transfer case control system.

How is the P1857 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage or corrosion, test the transfer case contact plate, and check for any other related issues in the transfer case control system.

Can I drive my Lincoln with the P1857 code active?

It is not recommended, as the transfer case may not function correctly, potentially causing drivetrain issues or leaving the vehicle stuck in an improper drive mode.

How can I fix the P1857 code on a Lincoln?

Repairs may include replacing damaged wiring or connectors, cleaning corroded connections, or replacing the faulty transfer case contact plate.

What tools are needed to repair the P1857 code?

Common tools include a multimeter for electrical testing, a scan tool for diagnostics, and basic hand tools for accessing and repairing the transfer case components.

How much does it cost to fix the P1857 code?

Repair costs can vary widely, typically ranging from $100 to $500, depending on whether the issue is a simple wiring repair or requires replacing the transfer case contact plate.

Can a faulty transfer case motor cause the P1857 code?

While the code specifically refers to the contact plate, a malfunctioning transfer case motor could also contribute to related issues and should be inspected during diagnosis.

How can I prevent the P1857 code from recurring?

Regular maintenance, including inspecting and cleaning electrical connections and ensuring the transfer case system operates smoothly, can help prevent this code from recurring.