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Code P0984

Quick reference

P0984 at a glance

Plain-language meaning
Your car's computer is having trouble controlling a part that helps it change gears smoothly.
Urgency
Moderate – Addressing this issue promptly can prevent further transmission damage.
Difficulty
Moderate
System
Transmission Control System Issue
Tools mentioned
OBD-II scanner, Multimeter, Transmission fluid and filter kit

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

Laymans terms

Your car's computer is having trouble controlling a part that helps it change gears smoothly.

Explanation

The P0984 code indicates that the vehicle's powertrain control module (PCM) has detected an issue with the performance or range of the shift solenoid E control circuit.

Technical description

Shift solenoids are used in automatic transmissions to control the flow of transmission fluid and manage gear shifts. The P0984 code is triggered when the PCM detects a performance problem or an out-of-range condition in the control circuit of shift solenoid E. This could be due to electrical issues, mechanical failure, or fluid problems within the transmission.

Symptoms

• Transmission slipping

• Harsh or erratic shifting

• Illuminated check engine light

Common Causes

• Faulty shift solenoid E

• Wiring issues in the shift solenoid E control circuit

• Low or dirty transmission fluid

Glossary

PCM: Powertrain Control Module

OBD-II: On-Board Diagnostics II

Diagnosis steps

• Check the transmission fluid level and condition.

• Inspect the wiring and connectors for damage or corrosion.

• Test the shift solenoid E for proper operation.

Repair procedures

• Replace the faulty shift solenoid E.

• Repair or replace damaged wiring or connectors.

• Change the transmission fluid and filter.

Tools required

• OBD-II scanner

• Multimeter

• Transmission fluid and filter kit

Estimated repair cost

$150 - $400

Difficulty level

Moderate

Commonly affected vehicles

• Honda Accord

• Toyota Camry

• Ford F-150

Preventive measures

• Regularly check and maintain transmission fluid levels.

• Perform scheduled transmission services.

• Inspect wiring and connectors for wear and tear.

Error code type

Transmission Control System Issue

User experience recommendations

• Avoid driving aggressively until the issue is resolved.

• Seek professional diagnostic and repair services.

• Monitor for any changes in vehicle performance.

Warranty information

Transmission components may be covered under the vehicle's powertrain warranty. Check with your manufacturer.

Historical data

The P0984 code has been associated with transmission issues in vehicles with high mileage or poor maintenance history.

Urgency level

Moderate – Addressing this issue promptly can prevent further transmission damage.

Testing conditions

• Vehicle at operating temperature.

• Transmission in drive or reverse.

Component location

Shift solenoid E is typically located inside the transmission, attached to the valve body.

FAQs

Q: Can I drive my car with a P0984 code?
A: It's not recommended to drive for extended periods with this code, as it can lead to transmission damage.

Q: How do I reset the P0984 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the code should not return.

Optional diagnostic gear

Tools that may help diagnose P0984

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.

View on Amazon
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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