AutoCodes – Generic – P284A

P284A Code - Shift Fork 'B' Stuck

Quick Answer

There are two electric motors used to shift the gears in the transmission, on for gears 1-3-5 and one for gears R-2-4-6. Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly. 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: P284A indicates Shift Fork 'B' Stuck.
Common causes: Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly.
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 22,749

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 Feb 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P284A Description

There are two electric motors used to shift the gears in the transmission, on for gears 1-3-5 and one for gears R-2-4-6. The gear shifting is made by two shift drums connected to shift motor pinion via two ideal gears. The maximum shift force is 1500N (337 lb). The motors are integrated in the Transmission Control Module (TCM) and work independently of each other.

OBDII Code P284A - Shift Fork 'B' Stuck - AutoCodes.com — P284A Code - Shift Fork 'B' Stuck

What does this mean?

What are the Possible Causes of the DTC P284A?

Outdated Transmission Control Module (TCM) program (Reprogram TCM)
Faulty Transmission Control Module (TCM)
Faulty Transmission Assembly

How to Fix the DTC P284A?

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 P284A 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 P284A code?

Need more information on how to fix the P284A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P284A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P284A Ford — Shift Fork 'B' Stuck
P284A Nissan — Shift Fork 'B' Stuck

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 P284A Code

1. What are the common symptoms of OBDII code P284A - Shift Fork 'B' Stuck?

- Common symptoms include difficulty shifting gears, grinding noises during gear changes, and the transmission not engaging properly.

2. What are some possible causes of OBDII code P284A - Shift Fork 'B' Stuck?

- Possible causes include a malfunctioning shift fork 'B', low transmission fluid levels, a faulty transmission control module (TCM), or mechanical issues within the transmission.

3. Can driving with OBDII code P284A - Shift Fork 'B' Stuck cause further damage to the vehicle?

- Continuing to drive with this issue can potentially cause damage to the transmission components and may lead to more costly repairs in the future.

4. How can I diagnose OBDII code P284A - Shift Fork 'B' Stuck at home?

- You can diagnose this issue by checking the transmission fluid level, inspecting for any visible damage to the shift fork 'B', and using an OBDII scanner to read the trouble code.

5. Is it safe to continue driving my vehicle with OBDII code P284A - Shift Fork 'B' Stuck?

- It is not recommended to drive the vehicle with this issue as it can lead to further damage and potentially unsafe driving conditions.

6. What are some repair tips for addressing OBDII code P284A - Shift Fork 'B' Stuck?

- Repair tips include checking and topping up transmission fluid levels, inspecting and possibly replacing the shift fork 'B', and seeking professional help for more complex transmission repairs.

7. Can resetting the OBDII code P284A - Shift Fork 'B' Stuck on my own fix the issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the shift fork 'B' to be stuck.

8. How much does it typically cost to repair OBDII code P284A - Shift Fork 'B' Stuck?

- The cost of repairs for this code can vary depending on the root cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Are there any preventive maintenance measures to avoid OBDII code P284A - Shift Fork 'B' Stuck in the future?

- Regularly checking and maintaining proper transmission fluid levels, addressing any unusual shifting behavior promptly, and following the manufacturer's recommended service schedule can help prevent this issue.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P284A - Shift Fork 'B' Stuck?

- While some basic troubleshooting and maintenance tasks can be done by DIY enthusiasts, addressing the underlying causes of this code may require specialized tools and expertise best handled by a professional mechanic.