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Chevrolet Impala Problems

Check Engine Light With Code P0171 and/or P0174 on Chevrolet Impala

Problem Description and Possible Solution

The exhaust gas recirculation (EGR) tube which connects the EGR valve to the intake manifold may develop an engine vacuum leak, causing the Check Engine Light to illuminate with code P0171 and/or P0174 stored.

(51 people reported this problem)

Chevrolet Impala Vehicles With This Problem

RepairPal Verified
Average mileage: 116,670 (16,580–181,000)
Exhaust & Emissions affected: 3.8L V6
8 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2007, 2008
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Viewing 1-17 of 17 comments
Check engine light came on and nothing happened for awhile. After a few months, the engine started making really loud sounds, like I was revving the engine, when my foot was not on the break or gas pedal. The noise has gotten progressively louder.
CHECK ENGINE LIGHT COMES ON AND OFF RANDOMLY, HAD IT CHECKED AND IT GAVE THE EGR CODE, NO PROBLEMS WITH THE CAR THOUGH LIGHT NOT ON ISSUE NOT FIXED
Changed egr valve 3 times now because thats what the codes show . Dealership Don Mullon has done a pressure check on vacum leaks. Low coolant light came on also. Now it has 150,000 Still same problem. This time it cost me 689.00 to fix .Replaceing EGR VALVE AGAIN and a coolant light sensor. I just replaced it less than 30 days ago cost me 227.00.
In Connecticut it will not pass emissions to get plates on the vehicle.
Egr tube leaking at manifold. If I spray carb cleaner where it bolts to intake engine speed up. Also gave code p0171. Drove me crazy.
Had to get EGR valve cleaned. Check engine light was on. Engine would cut off when at stop light. According to mechanic the EGR valve was getting stuck open when it should be closes when Im at a stop. Because it was stuck open, engine was not getting the right air/fuel mixture cause it too shut down
Only drove about 2 miles. Once I got a half mile from my destination out of no where, I notice at a stop light my engine was putting. It was running like complete cramp so I left it over night at the place I was headed to. Took it to am engine repair. Guy said my #2 cylinder is misfiring and something with my fuel egr.
Check engine light remains on, have not fixed the problem yet. This caused failure of the auto start feature, which is very disappointing.