AutoCodes – Generic – P0855

P0855 Code - Drive Switch Input Circuit High

Quick Answer

The Transmission Control Module (TCM) monitors the Drive Switch signal. Common causes include Faulty Drive Switch, Drive Switch harness is open or shorted, Drive Switch 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: P0855 indicates Drive Switch Input Circuit High.
Common causes: Common causes include Faulty Drive Switch, Drive Switch harness is open or shorted, Drive Switch 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 8,033

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 May 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0855 Description

The Transmission Control Module (TCM) monitors the Drive Switch signal. The TCM sets the OBDII code when the Drive Switch is not to factory specifications.

OBDII Code P0855 - Drive Switch Input Circuit High - AutoCodes.com — P0855 Code - Drive Switch Input Circuit High

What does this mean?

What are the Possible Causes of the DTC P0855?

Faulty Drive Switch
Drive Switch harness is open or shorted
Drive Switch circuit poor electrical connection

How to Fix the DTC P0855?

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 P0855 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 P0855 code?

Need more information on how to fix the P0855 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0855 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0855 Chrysler — Drive Switch Input Circuit High
P0855 Dodge — Drive Switch Input Circuit High
P0855 Jeep — Drive Switch Input Circuit High

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 P0855 Code

1. What does the OBDII code P0855 mean?

P0855 indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the drive switch input circuit, often related to the gear selector or transmission range switch.

2. What are the common symptoms of code P0855?

Symptoms may include the transmission not shifting properly, the gear indicator not displaying correctly, or the Check Engine Light being illuminated.

3. What causes the P0855 code to appear?

Common causes include a faulty drive switch, damaged wiring or connectors in the circuit, or a malfunctioning PCM.

4. How is the P0855 code diagnosed?

A mechanic will use a scan tool to monitor live data, inspect the drive switch, and check the wiring and connectors for damage or loose connections.

5. Can I drive my car with a P0855 code?

It’s possible to drive with this code, but it may cause shifting issues, which could lead to unsafe driving conditions or further damage to the transmission.

6. How do you fix the P0855 code?

Repairs may include replacing the drive switch, repairing or replacing damaged wiring or connectors, or reprogramming the PCM if necessary.

7. What tools are needed to troubleshoot the P0855 code?

A diagnostic scan tool, multimeter, and wiring diagram for the vehicle are typically used to identify the issue.

8. Will clearing the code fix the P0855 issue?

Clearing the code may temporarily turn off the Check Engine Light, but the underlying issue must be resolved to prevent the code from returning.

9. How much does it cost to repair a P0855 code?

Repair costs vary depending on the cause, but replacing a drive switch typically costs $100-$300, plus labor, while wiring repairs may cost less.

10. Can a bad battery cause the P0855 code?

A weak or failing battery is unlikely to directly cause this code, but it can contribute to electrical issues that may affect the drive switch circuit.