- Malfunctioning Transmission Control Module (TCM): The TCM is responsible for controlling the transmission's shifting. A faulty TCM can cause the transmission to not downshift properly.
- Faulty Transmission Solenoids: Solenoids are responsible for controlling the flow of transmission fluid within the transmission. A faulty solenoid can cause the transmission to not shift properly.
- Low Transmission Fluid: Insufficient transmission fluid can cause the transmission to not shift properly.
- Damaged Transmission Filter: A clogged or damaged transmission filter can restrict the flow of transmission fluid, which can cause the transmission to not shift properly.
- Worn Clutch Plates or Bands: Worn clutch plates or bands can cause the transmission to slip and not shift properly.
