The contact owns a 2004 Ford F-150. The contact stated that while driving at undisclosed speeds, the vehicle shuddered and failed to accelerate while the accelerator pedal was depressed. The check engine warning light was illuminated. The contact pulled over to the shoulder of the roadway and was able to restart the vehicle. The contact scanned the vehicle with a scanner and retrieved an unknown camshaft phaser error code. The local dealer was not contacted. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 100,000.