Rough Idle Due to Faulty EGR Switching Valve on Hyundai Sonata

On the 2.7L V6 and 2.4L 4 Cylinder, a defective exhaust gas recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.

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Average mileage: 105,825 (5,400–320,000)
Engines affected: 2.0L 4 Cylinder, 2.4L 4 Cylinder, 2.5L V6, 2.7L V6, 3.0L V6, 3.3L V6
14 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011, 2013
80 people reported this problem
38 people shared problem details
2003 Hyundai Sonata- 2.4L 4 Cylinder93,560
engine idles rough when in drive but not in neutral
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2001 Hyundai Sonata- 2.4L 4 Cylinder110,000
Rough idle, lack of acceleration at times, and poor gas mileage.
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2004 Hyundai Sonata- 2.4L 4 Cylinder37,000
Rough idle when stopped. Car shakes a lot.
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2002 Hyundai Sonata- 2.4L 4 Cylinder150,000
Rough idle and engine seems very rough while accelerating from a dead stop. Runs well at cruising speed. Only seem rough when the engine is under load.
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2004 Hyundai Sonata- 2.4L 4 Cylinder116,000
She runs ruff when idleing and even worse if the a/c is running . The shaking slows down if i put her in drive or neutral.
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2002 Hyundai Sonata- 2.4L 4 Cylinder67,000
engine light indicated need to repalce EGR valve. Did so a a week later it says the same thing again and idle is rough again. Why????
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2002 Hyundai Sonata- 2.4L 4 Cylinder80,000
Roough idle, jerks a little when driving, began to stall. Will change Throttle Position Sensor and see what happens.
2003 Hyundai Sonata- 2.4L 4 Cylinder45,600
Rough and unstable engine. Feels like gas is choked from engine or loose battery wires. Then car takes off. Scary! Not fixed yet
2004 Hyundai Sonata- 2.4L 4 Cylinder
Failed emissions due to egr
2004 Hyundai Sonata- 2.7L V6105,000
My 2004 Hyundai Sonata 2.7 V6 started having a rough, low rpm idle after it hit 105,000 miles. I haven't had it repaired yet but plan to do the work myself. Thanks cor the helpful information, much appreciated!
2002 Hyundai Sonata- 2.7L V6100,695
Check engine light, rpm fluctuations, shakes at stoplights. Also, has stalled when getting gas.
2001 Hyundai Sonata- 2.5L V6149,000
Car started shaking a lot when parked and engine was at idle. Check engine light is on and car shakes when in stopped in Park or Drive, but not neutral.
2002 Hyundai Sonata- 3.0L V6149,000
jerks while at red light, but put it in neutral and it runs smooth. Just put new plugs and wires in it.
2013 Hyundai Sonata- 2.0L 4 Cylinder5,400
Rough idle in drive
2006 Hyundai Sonata- 2.4L 4 Cylinder105,000
Rough idling loss of power I have been going threw this for three years no one can figure it out tired of spending money on a maybe it's this....ready to get rid of my car
2013 Hyundai Sonata- 2.4L 4 Cylinder8,000
Vibration and Shaking during Idle and in Drive Mode. More prominent when AC is on (even at the lowest fan speed)
2000 Hyundai Sonata- 2.4L 4 Cylinder
It shakes and dies and doesnt ideal
2011 Hyundai Sonata- 2.0L 4 Cylinder54,029
Car idles out and dies when stopped
1998 Hyundai Sonata- 2.4L 4 Cylinder150,123
I still have the problem. Car does not turn off but rpm goes to cero at idle
2010 Hyundai Sonata- 2.4L 4 Cylinder103,000
Engine came on about a week and a half ago ran fine till today when I was at a stop light and it starting idling rough. I kept going and came to a stop light where I almost stalled. It's idling below 1000 rpm almost to half and shaking. Can't get it into the shop till next thursday. Don't know what code it's throwing going to get that checked tomorrow.
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