1. Transmission Fluid Level: Low transmission fluid can cause the overdrive light to blink. Check the transmission fluid level using the dipstick under the hood. Ensure the fluid is at the proper level and if necessary, top it off with the correct transmission fluid recommended for your vehicle.
2. Transmission Solenoids: Faulty transmission solenoids, which are responsible for controlling the transmission's shifting, can cause the overdrive light to blink. These solenoids can get stuck or malfunction due to wear, electrical problems, or contamination in the transmission fluid.
3. Transmission Control Module (TCM): The TCM, also known as the Powertrain Control Module (PCM), is responsible for controlling the transmission's operations. If there's an issue with the TCM, such as a software glitch or a faulty sensor input, it can affect the transmission's shifting and cause the overdrive light to blink.
4. Wiring Harness: The overdrive light may blink if there's a problem with the wiring harness connecting the transmission and the TCM or other related sensors. Damaged or loose wiring can disrupt communication and lead to irregular transmission behavior.
5. Internal Transmission Issues: In some cases, the blinking overdrive light can indicate more severe internal transmission problems such as worn gears, damaged clutches, or hydraulic issues. If the problem persists, it's advisable to have a qualified mechanic inspect and diagnose the transmission to determine the exact cause.
It's important to address the issue promptly as continued driving with a blinking overdrive light can further damage the transmission and lead to costly repairs. It's recommended to have the vehicle inspected by a professional mechanic experienced with Mazda vehicles to diagnose the exact cause and perform any necessary repairs.
