In this article, we will dissect everything you need to know about the fault code: what it means, what causes it, how to diagnose it correctly, and—most importantly—how to fix it without wasting time or money on unnecessary parts. What Does Code P306D Mean on a Peugeot? P306D is defined as: "Cylinder 6 Glow Plug Control Circuit / Glow Plug Resistance Outside Parameters."
If you own a modern Peugeot (such as the 208, 308, 508, 3008, or Boxer) and your diagnostic scanner has flashed the code P306D , you are likely looking at your dashboard’s engine management light (EML) with a mixture of confusion and concern. Unlike common codes like P0171 (system too lean) or P0420 (catalyst efficiency), P306D is a manufacturer-specific code. This means its definition is not standardized across all car brands—it is unique to the PSA (Peugeot-Citroën) group and its partner, Ford (for certain diesel engines). p306d peugeot