2008 Dodge Dakota 3.7L V6 P0622 Code: Battery Warning Light and Voltage Issues
Hello everyone, I'm having a persistent issue with my 2008 Dodge Dakota Sport equipped with the 3.7L V6 engine. The battery warning light has been on for some time, so I checked both the battery and alternator voltage using a multimeter. The battery reads 12.02 volts when off, though I didn't record the alternator's output at that time. I've since replaced both the battery and the alternator with new units. After the replacement, the battery shows a stable 12.78 volts when the engine is off, but drops to 12.28 volts while running — which is within normal range for a healthy system. However, my vehicle still displays Diagnostic Trouble Code P0622. I'm not sure what component to investigate next. Could this be related to a fusible link? I've heard that some vehicles have sensitive voltage monitoring circuits that may trigger the code even if the alternator is functioning properly. Any advice on how to diagnose or fix this issue would be greatly appreciated.
Apologies for the earlier mistake — I meant 'fusible link', not 'inline fuse'. The fusible link is a common point of failure in older Dodge Dakotas and can cause P0622 to appear even when battery voltage seems normal. It's worth checking the wiring harness or the specific fusible link located near the alternator or battery.