AutoCodes – Ford – P1857 Ford

P1857 Ford 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 Ford 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 5,256

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

What does this mean?

What are the Possible Causes of the DTC P1857 Ford?

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 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 P1857 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.

Frequently Asked Questions about P1857 Ford Code

1. What are the common symptoms of OBDII code P1857 in a Ford related to the Transfer Case Contact Plate 'C' short circuit to ground?

The common symptoms include the check engine light being illuminated, difficulty shifting gears, and potential issues with the transfer case.

2. What are the possible causes of OBDII code P1857 in a Ford indicating a Transfer Case Contact Plate 'C' short circuit to ground?

Possible causes include damaged wiring or connectors, a faulty contact plate 'C', or issues with the transfer case motor.

3. How can I diagnose OBDII code P1857 in a Ford related to the Transfer Case Contact Plate 'C' short circuit to ground?

Diagnosis involves using a scan tool to retrieve the specific code, inspecting the wiring and connectors for damage, and testing the contact plate 'C' and transfer case motor for proper functioning.

4. Can I continue to drive my Ford with OBDII code P1857 indicating a Transfer Case Contact Plate 'C' short circuit to ground?

It is not recommended to continue driving the vehicle with this code, as it can lead to further damage to the transfer case components and potentially cause safety issues.

5. How can I repair OBDII code P1857 in a Ford related to the Transfer Case Contact Plate 'C' short circuit to ground?

Repair involves fixing any damaged wiring or connectors, replacing the faulty contact plate 'C' if needed, and addressing any issues with the transfer case motor.

6. Are there any DIY tips for addressing OBDII code P1857 in a Ford indicating a Transfer Case Contact Plate 'C' short circuit to ground?

While simple tasks like checking for loose connections can be done DIY, it is recommended to have a professional diagnose and repair the issue to ensure proper resolution.

7. How much does it typically cost to fix OBDII code P1857 in a Ford related to the Transfer Case Contact Plate 'C' short circuit to ground?

The cost can vary depending on the extent of the damage and the specific repairs needed, but it is advisable to budget for both diagnostic fees and potential parts and labor costs.

8. Can weather conditions or off-road driving contribute to triggering OBDII code P1857 in a Ford for Transfer Case Contact Plate 'C' short circuit to ground?

Extreme weather conditions or rough terrain can potentially contribute to the development of issues leading to this code, especially if they cause damage to the vehicle's components.

9. Is resetting the OBDII system an effective way to temporarily clear OBDII code P1857 in a Ford due to Transfer Case Contact Plate 'C' short circuit to ground?

Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem persists.

10. Can OBDII code P1857 in a Ford related to a Transfer Case Contact Plate 'C' short circuit to ground affect the vehicle's drivability?

Yes, this code can affect the vehicle's drivability by causing issues with shifting gears and potentially impacting the overall performance of the transfer case system.