CPC 4: Troubleshooting Common Issues 🔧🚚 CPC 4 controllers, commonly found in Freightliner and other Detroit-powered trucks, can sometimes experience glitches that affect throttle response, communication, and gauge functionality. Here are some of the most common CPC 4 issues: -No throttle response: The engine doesn't respond to pedal input. 🚫🚛 -No communication: The controller loses communication with the ECM or other components. 🔄🔌 -No start: The engine won't crank or start. 🚫🔑 -Random g