One problem related to alternator/generator/regulator has been reported for the 2004 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Hyundai Sonata based on all problems reported for the 2004 Sonata.
Leaking valve cover is allowing oil to leak down onto the alternator. Car can be stationary or running. Most notable when car engine is running. Oil leaking onto alternator can cause alternator to short. Alternator failed and car battery could not charge battery. Car died while my wife was driving and she had to pull quickly off to the side of the road.
| Electrical System problems | |
| Wiring problems | |
| Battery problems | |
| Alternator/generator/regulator problems | |
| Dash Wiring problems | |
| Anti-theft Controller problems | |
| Horn Assembly problems | |
| Ignition problems | |
| Headlights Turn Off While Driving problems |