P284A Shift Fork “B” Stuck

Code P284A – Possible Causes and Solutions

Possible Causes:

• Outdated transmission control module (TCM) program → Reprogramming required
• Faulty transmission control module (TCM)
• Mechanical issue in the transmission assembly

How to Fix Code P284A:

1. Check the possible causes mentioned above.
2. Visually inspect the wiring harness and associated connectors.
3. Look for signs of damage: broken, bent, corroded, or pushed-out pins.
4. Ensure the control module is functioning properly and up to date.

Possible Symptoms:

• Illumination of the engine light (or maintenance warning light).

Meaning of Code P284A:

The transmission uses two electric motors for gear shifting:

• One motor for gears 1-3-5
• Another for gears R-2-4-6

Gear shifting is achieved through two drums connected to the shift motor pinion via two intermediate gears. The maximum force applied during gear shifting is 1500 N (337 lb). These motors are integrated into the transmission control module (TCM) and operate independently.