We had a 2012 Dodge Ram 2500 come into Stadium Automotive and the customer was complaining that the Dodge Ram had issues with rattling at startup. After further inspection, we found the Dodge Ram to have codes for what was looking like issues with the fuel pressure sensor. The Dodge Ram with the Cummins diesel engine is one that the fuel injectors require tremendous amounts of fuel pressure to run, about 25,000 PSI. If the fuel is not brought to the right pressure it will rattle when cold because the injectors are not getting enough fuel to the cylinders and that can cause the engine to rattle until it warms up. Once the vehicle is warm it will run fine all day. We found the fuel pressure sensor to be reading pressure when there was no pressure in the fuel system. After checking all the electrical connections at the fuel pressure sensor we determined the 2012 Dodge Ram to have a faulty fuel pressure sensor. After replacement of th
e fuel pressure sensor and resetting the engine control module the Dodge Ram's engine is performing normally. Today's vehicles have so much technology it’s amazing; we are all driving computers on wheels.