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: 112,138 (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
85 people reported this problem
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problem details
2003 Hyundai Sonata - 2.4L 4 Cylinder 93,560 mi,
engine idles rough when in drive but not in neutral
2004 Hyundai Sonata - 2.4L 4 Cylinder 37,000 mi,
Rough idle when stopped. Car shakes a lot.
2002 Hyundai Sonata - 2.4L 4 Cylinder 67,000 mi,
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????
2004 Hyundai Sonata - 2.4L 4 Cylinder 116,000 mi,
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.
2001 Hyundai Sonata - 2.4L 4 Cylinder 110,000 mi,
Rough idle, lack of acceleration at times, and poor gas mileage.
2002 Hyundai Sonata - 2.4L 4 Cylinder 150,000 mi,
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.
2003 Hyundai Sonata - 2.4L 4 Cylinder 45,600 mi,
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 - 2.7L V6 105,000 mi,
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 - 2.4L 4 Cylinder 80,000 mi,
Roough idle, jerks a little when driving, began to stall. Will change Throttle Position Sensor and see what happens.
2005 Hyundai Sonata - 2.4L 4 Cylinder 264,000 mi,
Car vibrates. Changed EGR solenoid valve. Still vibrates, check engine light still on, OBD II still reads exhaust gas recirculation low.
2001 Hyundai Sonata - 2.5L V6 149,000 mi,
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 - 2.7L V6 100,695 mi,
Check engine light, rpm fluctuations, shakes at stoplights. Also, has stalled when getting gas.
2006 Hyundai Sonata - 2.4L 4 Cylinder 159,000 mi,
My sonata dies when I slow down at red lights and when I slow down to make a turn.
2013 Hyundai Sonata - 2.0L 4 Cylinder 5,400 mi,
Rough idle in drive
2002 Hyundai Sonata - 2.4L 4 Cylinder 149,000 mi,
When car is idle on stop, rattling noise. But on neutral or drive sound dissipates.
2005 Hyundai Sonata - 3.0L V6 125,000 mi,
when a/c in on the engine almost dies when in gear
2011 Hyundai Sonata - 2.0L 4 Cylinder 54,029 mi,
Car idles out and dies when stopped
2009 Hyundai Sonata - 2.4L 4 Cylinder 85,000 mi,
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.
2004 Hyundai Sonata - 2.4L 4 Cylinder
Failed emissions due to egr
2004 Hyundai Sonata - 2.0L 4 Cylinder 200,000 mi,
car vibrates severely while idling in gear...but smooths out while in gear or neutral 2004 kia optima 4 cyl 2.4