When your car's ECU, PCM, or ECM malfunctions, it can manifest in various ways, affecting performance and drivability. Here are some common issues to watch out for and troubleshooting tips to help you address them: Transmission issues, such as gear slipping or harsh shifting Increased emissions or failed emissions tests Loss of power or responsiveness ...

When your car's ECU, PCM, or ECM malfunctions, it can manifest in various ways, affecting performance and drivability. Here are some common issues to watch out for and troubleshooting tips to help you address them: Transmission issues, such as gear slipping or harsh shifting Increased emissions or failed emissions tests Loss of power or responsiveness ...