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Code P085E

Quick reference

P085E at a glance

Plain-language meaning
This code means that the computer in your car is having trouble with the part that helps control how the gears change when you drive.
Urgency
Moderate – It is advised to address this issue soon to avoid potential transmission damage.
Difficulty
Moderate
System
Transmission Performance Issue
Tools mentioned
OBD-II scanner, Multimeter, Basic hand tools

This summary uses the existing diagnostic information shown in full below.

Laymans terms

This code means that the computer in your car is having trouble with the part that helps control how the gears change when you drive.

Explanation

The P085E code indicates a performance issue with the Gear Shift Control Module B, which is responsible for managing gear changes.

Technical description

The Gear Shift Control Module B monitors and controls the gear shifting mechanism. When the module detects a performance issue, such as incorrect gear changes or unexpected behavior, it triggers the P085E code.

Symptoms

• Check Engine Light is on

• Erratic or harsh gear shifting

• Transmission stuck in one gear

Common Causes

• Faulty Gear Shift Control Module B

• Wiring issues or poor connections

• Software or calibration errors

Glossary

Gear Shift Control Module: An electronic component that manages the gear shifting process in a vehicle.

OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnosing and reporting.

Diagnosis steps

• Check for other related codes

• Inspect wiring and connections to the module

• Test the Gear Shift Control Module B functionality

Repair procedures

• Repair or replace faulty wiring

• Reprogram or replace the Gear Shift Control Module B

• Perform a software update if available

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$200 - $800

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular maintenance of transmission system

• Ensure software updates are applied

• Check wiring and connections periodically

Error code type

Transmission Performance Issue

User experience recommendations

• Avoid driving aggressively until repaired

• Get the vehicle inspected by a professional

• Monitor for any changes in vehicle behavior

Warranty information

Repairs may be covered under powertrain warranty if the vehicle is still within warranty period.

Historical data

This code has been associated with vehicles that have electronic gear shift systems and has become more common as these systems have become prevalent.

Urgency level

Moderate – It is advised to address this issue soon to avoid potential transmission damage.

Testing conditions

• Vehicle must be in a safe location

• Engine should be off before inspecting wiring

Component location

The Gear Shift Control Module B is typically located near the transmission or within the vehicle's cabin, depending on the vehicle model.

FAQs

Q: Can I drive with a P085E code?
A: It's not recommended to drive long distances with this code as it may cause further damage to the transmission.

Q: How do I reset the P085E code?
A: After repairs, you can use an OBD-II scanner to clear the code, but it may return if the underlying issue is not fixed.

Optional diagnostic gear

Tools that may help diagnose P085E

THINKCAR ThinkScan Bidirectional diagnostic tool illustration

High-End · Full-system diagnostics

THINKCAR ThinkScan Bidirectional

A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.

Network faults often require full-system access instead of a generic code reader alone.

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Klein Tools MM325 diagnostic tool illustration

Universal · Digital multimeter

Klein Tools MM325

A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.

Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.

View on Amazon
WORKPRO Wiring Repair Kit diagnostic tool illustration

Universal · Wire connectors and repair kit

WORKPRO Wiring Repair Kit

Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.

Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.

View on Amazon

These are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.

Source: ezOBD2 diagnostic database
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