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: 108,610 (11,386–320,000)
Engines affected: 2.0L 4 Cylinder, 2.4L 4 Cylinder, 2.5L V6, 2.7L V6, 3.3L V6
13 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011, 2013
69 people reported this problem
29 people shared problem details
2003 Hyundai Sonata- 2.4L 4 Cylinder93,560
engine idles rough when in drive but not in neutral
25 people like thisFlag inappropiate
2001 Hyundai Sonata- 2.4L 4 Cylinder110,000
Rough idle, lack of acceleration at times, and poor gas mileage.
23 people like thisFlag inappropiate
2004 Hyundai Sonata- 2.4L 4 Cylinder37,000
Rough idle when stopped. Car shakes a lot.
19 people like thisFlag inappropiate
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????
13 people like thisFlag inappropiate
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.
10 people like thisFlag inappropiate
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.
6 people like thisFlag inappropiate
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
6 people like thisFlag inappropiate
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.
4 people like thisFlag inappropiate
2004 Hyundai Sonata- 2.4L 4 Cylinder
Failed emissions due to egr
2 people like thisFlag inappropiate
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!
1 person likes thisFlag inappropiate
2002 Hyundai Sonata- 2.7L V6100,695
Check engine light, rpm fluctuations, shakes at stoplights. Also, has stalled when getting gas.
1 person likes thisFlag inappropiate
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.
1 person likes thisFlag inappropiate
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.
Exactly as stated. Rough idle in drive. Replaced the canister purge switching valve, [easy], problem solved. This model has no EGR valve, likewise no EGR.
2005 Hyundai Sonata- 2.7L V6165,000
Exact problem as stated. On my Sonata there is no EGR stitching valve or EGR valve. There is however, a canister purge valve. That corrected the problem.
2004 Hyundai Sonata- 2.4L 4 Cylinder110,000
Third EGR Valve since 2012! Help
2003 Hyundai Sonata- 2.4L 4 Cylinder105,000
my 2003 hyundai sonata 2.4 vibrates so hard when I'm at idle calms down in neutral
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