AutoCodes – Generic – P085A

P085A Code - Gear Shift Control Module 'B' Communication Circuit

Quick Answer

The Engine Control Module (ECM) monitors the Gear Shift Control Module. Common causes include Faulty Gear Shift Control Module 'B', Gear Shift Control Module 'B' harness is open or shorted, Gear Shift Control Module 'B' 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: P085A indicates Gear Shift Control Module 'B' Communication Circuit.
Common causes: Common causes include Faulty Gear Shift Control Module 'B', Gear Shift Control Module 'B' harness is open or shorted, Gear Shift Control Module 'B' 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 8,547

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
Comments
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Code P085A Description

The Engine Control Module (ECM) monitors the Gear Shift Control Module. The ECM sets the OBDII when there is a problem communicating with the Gear Shift Control Module.

OBDII Code P085A - Gear Shift Control Module 'B' Communication Circuit - AutoCodes.com — P085A Code - Gear Shift Control Module 'B' Communication Circuit

What does this mean?

What are the Possible Causes of the DTC P085A?

Faulty Gear Shift Control Module 'B'
Gear Shift Control Module 'B' harness is open or shorted
Gear Shift Control Module 'B' circuit poor electrical connection

How to Fix the DTC P085A?

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 P085A 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.