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: 108,660 (11,386–320,000)
Engines affected: 2.0L 4 Cylinder, 2.4L 4 Cylinder, 2.5L V6, 2.7L V6, 3.3L V6
14 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011, 2013
73 people reported this problem
33 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 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 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.
Upvoted (14)Flag Inappropriate
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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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
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.
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.
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.
2003 Hyundai Sonata- 2.7L V6130,000
Rough idle at idle when ac is on and in drive. It's okay when in natural. Starting to have the same problem when AC is off.
2002 Hyundai Sonata- 2.4L 4 Cylinder149,000
When car is idle on stop, rattling noise. But on neutral or drive sound dissipates.
2009 Hyundai Sonata- 2.4L 4 Cylinder85,000
Check engine light came on the first time when we were up at elevation. From there the engine (at different times) seemed to idle a little rough and get worse gas mileage.
2002 Hyundai Sonata- 2.4L 4 Cylinder11,386
check engine light is on, car running a little rough.
2006 Hyundai Sonata- 2.4L 4 Cylinder159,000
My sonata dies when I slow down at red lights and when I slow down to make a turn.
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