1. Faulty Odometer Gear: The odometer gear is a small plastic gear that connects the speedometer cable to the odometer. If this gear is damaged or worn out, it can prevent the odometer from registering miles.
2. Broken Speedometer Cable: The speedometer cable is a flexible metal cable that connects the speedometer to the transmission. If this cable is broken or disconnected, it can prevent the speedometer from working and the odometer from registering miles.
3. Faulty Speedometer Head: The speedometer head is the instrument cluster that contains the speedometer and odometer. If the speedometer head is faulty, it can prevent the odometer from registering miles.
4. Electrical Issues: Electrical problems, such as a faulty sensor or wiring issue, can also prevent the odometer from registering miles.
To diagnose the exact cause of the problem, it is recommended to take your vehicle to a qualified mechanic for inspection and repair.