The B1384 Code appears for the error of engine. The engine trusts on the glow plugs to produce heat to help with the combustion cycle. Some engines only use the radiance plugs when cold but others will permit the glow plugs to run when the ECU wants them to be on to aid with ignition. Problems in this area will cause diesel engine primary problems, rough running and white smoke when the engine is cold. Disconnected, dirty spark plugs are the main causes for engines that will not start. Spark plugs usually need to be changed every term or 25 hours of use.