What is code P1682 for Dodge Durango 2000?

Answer 1

The code means "Charging system voltage too low". The PCM (computer) is not seeing the correct voltage from the alternator. Before you start ripping apart the engine to remove the alternator, check the serpentine belt tension. The tensioner pulley spring is prone to rusting and sticking, which causes the belt to slip on the pulleys driving the alternator, water pump, Power Steering pump etc. If the belt tension seems good (stiff, with very little give) have the alternator checked at the auto parts store (requires removal). If the belt seems loose, squirt some oil onto the spring of the tensioner pulley, and work it back and forth with a 15mm box end wrench attached to the bolt on the front of the pulley. Clockwise will loosen the belt, then release a few times. Squirt the oil (I use motor oil) into the slit on the top of the tensioner assembly, which is located below and to the left of the alternator, just to the right of the ignition coil. Obvoiusly, you should avoid getting oil on the belt. If the spring doesn't loosen, changing out the tensioner is a snap. Good luck!