I have an 06 Hemi 1500 truck. My check engine light came on the other day and it stays on until I shut off the engine. If I understand correctly I hold in the odometer reset button as I turn the key on to check the codes. I get the following codes in this order... S 116 . 281 C 447. Then not every time I check this but some times, when the gauge check clears I get this code... Hr 3499. Can anyone help me with the meaning of these codes?