CAUSE B - BAD RAIL PRESSURE SENSORPROCEDURE OR ACTION:1. Ensure truck power is OFF.2. Verify DMM to ohms scale. Verify DMM zero reading.3. Disconnect wiring harness connector from rail pressure sensor connector.4. Measure resistance across each pin of the rail pressure sensor and ground.Is resistance low or close to zero?YES: The sensor has shorted to ground. Replace sensor. Reconnect sensor connector to wiring harness. Goto Step 5.NO: Go to Step 6.5. Turn truck power ON and start engine.Does reported DTC reoccur?