P284D Possible Causes
- Outdated Transmission Control Module (TCM) programming (reprogram TCM)
- Faulty Transmission Control Module (TCM)
- Defective transmission assembly
How to Fix P284D Code
Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Check engine light illuminated (or service engine soon warning light)
P284D Meaning
There are two electric motors used for shifting gears in the transmission, one for gears 1-3-5 and one for gears R-2-4-6. The gear shift is performed by two shift drums connected to the shift motor pinion via two ideal gears. The maximum shifting force is 1500 N (337 lb). The motors are integrated into the Transmission Control Module (TCM) and operate independently of each other.