If your 2015 Nissan Altima transmission hesitates, slips gears or flashes a warning light, it may be malfunctioning. Diagnosing the problem early can save you time and money. Begin by inspecting the CVT fluid, which should be clear and pink, not dark or burnt. If the fluid level is low or contaminated, there could be a simple solution. Then, use a diagnostic scan tool to read any recorded gearbox trouble codes. These codes may indicate problems such as defective solenoids, overheating, or sensor issues. Pay attention to any noises made during acceleration or deceleration, as well as indicators of shuddering at low speeds, as these are also classic CVT symptoms.