AutoCodes – Generic – P1858

P1858 Code - Transmission Transfer Case Contact Plate 'D' Circuit Failure

Quick Answer

The Transmission Control Module (TCM) monitors the Transmission Transfer Case Contact Plate 'D'. Common causes include Faulty Transfer Case Shift Motor, Transfer Case Shift Motor harness is open or shorted, Transfer Case Shift Motor 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: P1858 indicates Transmission Transfer Case Contact Plate 'D' Circuit Failure.
Common causes: Common causes include Faulty Transfer Case Shift Motor, Transfer Case Shift Motor harness is open or shorted, Transfer Case Shift Motor 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 14,916

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 Jan 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1858 Description

The Transmission Control Module (TCM) monitors the Transmission Transfer Case Contact Plate 'D'. The TCM sets the OBDII code when the Transmission Transfer Case Contact Plate 'D' is not to factory specifications.

OBDII Code P1858 - Transmission Transfer Case Contact Plate 'D' Circuit Failure - AutoCodes.com — P1858 Code - Transmission Transfer Case Contact Plate 'D' Circuit Failure

What does this mean?

What are the Possible Causes of the DTC P1858?

Faulty Transfer Case Shift Motor
Transfer Case Shift Motor harness is open or shorted
Transfer Case Shift Motor circuit poor electrical connection

How to Fix the DTC P1858?

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 P1858 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 P1858 code?

Need more information on how to fix the P1858 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1858 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1858 Ford — Transmission Transfer Case Contact Plate 'D' Circuit Failure
P1858 Lincoln — Transmission Transfer Case Contact Plate 'D' Circuit Failure
P1858 Mercury — Transmission Transfer Case Contact Plate 'D' Circuit Failure
P1858 Mitsubishi — Even Number Gear Axle Interlock

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 P1858 Code

1. What are common symptoms of OBDII code P1858?

The common symptoms of OBDII code P1858 include issues with shifting gears, transmission slipping, and the vehicle getting stuck in a particular gear.

2. What can cause OBDII code P1858 to trigger?

OBDII code P1858 is triggered by a failure in the transmission transfer case contact plate 'D' circuit, which can be caused by a faulty contact plate, damaged wiring, or a poor connection.

3. How serious is OBDII code P1858?

OBDII code P1858 should be addressed promptly as it can lead to transmission issues and affect the drivability of the vehicle. Ignoring this code may result in further damage to the transmission system.

4. Can I still drive my vehicle with OBDII code P1858?

It is not recommended to drive your vehicle with OBDII code P1858 as it can cause further damage to the transmission system. It is best to have the issue diagnosed and repaired by a qualified mechanic.

5. How is OBDII code P1858 diagnosed?

Diagnosing OBDII code P1858 involves using a scan tool to retrieve the code, inspecting the transmission transfer case contact plate 'D' circuit for any faults, and testing the wiring and connections for continuity.

6. What is the typical repair for OBDII code P1858?

The typical repair for OBDII code P1858 involves replacing the faulty transmission transfer case contact plate 'D' circuit, repairing any damaged wiring, and ensuring all connections are secure.

7. Can I fix OBDII code P1858 myself?

While some DIY enthusiasts may attempt to fix OBDII code P1858 themselves, it is recommended to have this issue addressed by a professional mechanic with experience in transmission systems to ensure proper diagnosis and repair.

8. How much does it cost to repair OBDII code P1858?

The cost to repair OBDII code P1858 can vary depending on the extent of the damage and the specific repairs needed. It is advisable to get a few quotes from reputable mechanics to compare prices.

9. How long does it take to repair OBDII code P1858?

The repair time for OBDII code P1858 can vary depending on the complexity of the issue and the availability of parts. In general, this repair can take a few hours to complete.

10. Can OBDII code P1858 reoccur after being repaired?

If the root cause of OBDII code P1858 is not properly addressed during the repair, it is possible for the code to reoccur. It is crucial to ensure that all related components are thoroughly inspected and repaired to prevent future issues.