Why is the car weak and slow after replacing the controller?

[Edith]

The following are the reasons why the car is weak and slow after replacing the controller: 1. Battery aging: A new battery has sufficient power, providing strong performance and fast speed. However, after a year of use, the battery's capacity to hold charge decreases, and it quickly depletes even after a full charge. 2. Battery quality: When buying an electric vehicle, it is essential to choose a high-quality battery and not just go for the cheapest option. Cheap products often lack quality, and some may look good on the outside but have poor internal components. 3. Temperature effects: The performance of an electric vehicle's battery varies between summer and winter. The battery works better in summer, allowing for longer distances, while in winter, due to temperature effects, the battery's charge-holding capacity decreases, reducing the distance the vehicle can travel.

[OAustin]

I usually enjoy tinkering with cars. After replacing the controller, the car lacks power and slows down, often due to installation issues. If the power connector of the control unit isn't plugged in tightly or has poor contact, the signal weakens, limiting engine output. Loose connectors can also cause communication interruptions, so it's necessary to check all wiring. Not resetting the system is even more troublesome—the new car controller needs to initialize and learn parameters, such as matching the RPM range, otherwise it will operate at default low power. Also, is the controller model compatible with the car's original computer? Incompatibility can reduce response speed. I recommend using a dedicated diagnostic tool to check for fault codes and identify the specific limiting cause. Don't forget safety first—insufficient power can easily lead to accidents when climbing hills or overtaking. Get a technician to fix it promptly; don't try to tough it out yourself.

[BentleyLee]

Reduced power after controller update is mostly due to configuration issues. The new controller requires programming to adapt to the vehicle. If VIN or engine parameters aren't correctly entered, it enters protection mode reducing output. Proper matching is crucial, like establishing communication via OBD interface initialization. Incorrect software versions or calibration errors (e.g., excessive throttle delay settings) can cause sluggishness. Also verify complete data cable connections – signal loss may limit performance. Connect a diagnostic tool to read fault logs and check if relevant settings are properly adjusted. Professional calibration is essential to prevent long-term engine damage while ensuring safety.

[SanAllie]

The car becoming sluggish after changing the controller is likely due to poor hardware or software compatibility. If the controller model doesn't match the vehicle type, incorrect signal output can cause power limitations, such as reduced torque response. Insufficient power supply is another issue - blown fuses or corroded ground wires may lead to unstable power delivery. Additionally, sensors like the mass airflow sensor not being properly connected could make the new controller misread data and enforce throttling. It's best to check the compatibility list to confirm matching. DIY attempts often overlook details, so professional diagnosis saves time and effort.