![]() Still, the Mazda dealers are well aware of these issues, and they will likely help you out if you get stuck trying to diagnose it. And since the TCM is responsible for reporting fault codes, diagnosing it can be a nightmare because it might throw several false fault codes at once. Transmission Control Module FailureĪlthough the TCM or any other control module rarely ever fails, it is a common problem on the Mazda 3. The low transmission fluid can quickly cause irreparable damage to the transmission, so have it sorted out as soon as you can. It’s also important to mention that this is a very time-sensitive job. There, a top-up will likely set you back around $50 to $100, while a fluid change will be closer to $200. Unfortunately, there is no easy way of replacing or even topping up the transmission fluid, so it’s best to take the car to a repair shop. So, whatever the case may be, leaks or old fluid, do a transmission fluid replacement and fix the leaks. When it comes to the Mazda 3, you should ideally replace the transmission fluid every 90,000 miles. It’s also worth mentioning that old fluid can also be a problem since it will lead to low pressure. So that’s the first thing you should start looking for, especially if you get the P0868 fault code. Mazda 3 AT Light – Causes and Fixes Low Transmission FluidĮven though the transmission is a closed system, it’s not immune to fluid leaks. P0868 – Low Transmission Fluid Pressure.P0700 – Transmission Control Module (TCM).Also, you might not get the corresponding P0700 fault code with a defective TCM, so keep that in mind. However, if there are multiple fault codes, chances are the transmission has failed or the TCM is faulty. After that, if you get any of the following fault codes, you are in luck. So, for starters, you should get an OBD2 scan tool and start scanning the fault codes. Also, because there are several causes, the transmission will automatically go into limp mode. ![]() So, without a proper scan tool or professional diagnosis, it’s nearly impossible to know what exactly is behind the warning light. That means it can represent any and all possible issues with the transmission. ![]() The AT light, short for Automatic Transmission, is essentially the transmission’s check engine light. The AT light in a Mazda 3 indicates an issue with the automatic transmission, with the most common causes being low transmission fluid, a faulty TCM (Transmission Control Module), a faulty TSS (Turbine Speed Sensor), transmission failure, and transmission solenoids. Still, if you stop the car and restart it, you will probably be able to drive normally afterward, but that doesn’t solve the underlying problem. Moreover, the transmission will likely get stuck in third gear once the AT lights up. And even the dealers are often not that helpful in diagnosing the problem. Many Mazda 3 owners have encountered the AT warning light with varying success in solving the issue.
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