* Low Transmission Fluid: This is the most common cause. Low fluid level means less lubrication and pressure, leading to slippage. Check the fluid level (when the engine is running and warm) and condition. Dark, burnt-smelling fluid indicates a serious problem.
* Worn-out Clutch Packs: The clutch packs inside the automatic transmission wear down over time. This wear reduces their ability to grip, causing slippage. This is a major repair requiring a transmission rebuild or replacement.
* Faulty Transmission Solenoids or Valves: These control fluid flow within the transmission. A malfunctioning solenoid or valve can disrupt shifting and cause slippage. Diagnosis requires specialized tools and expertise.
* Worn-out Torque Converter: The torque converter acts as a fluid coupling between the engine and transmission. Wear can lead to slippage, especially when accelerating. Replacement is a significant repair.
* Internal Transmission Problems: More serious internal issues like worn planetary gears, damaged shafts, or other internal components can cause slippage. This often requires a complete rebuild or replacement of the transmission.
* Incorrect Transmission Fluid: Using the wrong type or viscosity of transmission fluid can damage the transmission and cause slippage.
* Electrical Problems: Issues with the wiring harness or transmission control module (TCM) can affect the transmission's operation and lead to slippage.
It's crucial to have a qualified mechanic diagnose the specific problem. Attempting to fix a slipping transmission yourself can be difficult and may worsen the damage. The mechanic will need to inspect the transmission fluid, check for error codes, and likely perform a road test to pinpoint the cause.
