2015 GMC Terrain 2.4 code P0411
#1
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I have a 2015 GMC Terrain with the 2.4L Ecotec motor Cali emissions. I got a code P0411 for the AIR system flow. I went to dealer to get part information and ordered parts online with the OEM part numbers. I replaced the air pump and both solenoid valves. Code is still setting. I Pulled the hose on solenoids and started up when cold, found air pump is operational and valves are opening because I can feel the exhaust puffing out the solenoid when open. Is there a bulletin or another issue that can cause this problem?
#2
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What testing have you done?
#4
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Did you reset the code after repairs were made?
How many miles on the vehicle?
How many miles on the vehicle?
#5
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I have cleared the code several times with my scan tool. But will reset immediately on cold startup. Vehicle has about 83k miles. I did see a GM bulletin posted for P0411 but I was not able to open the bulletin to read it. Does anyone know what this bulletin is referencing? I know in the past the exhaust manifolds would crack on the older ECOTEC motors and I am wondering if this might be an issue. I would have to remove the heat shield to see if it is cracked. I was a GM tech for 15 years, but been out of the business for 6 years and have no access to any information anymore.
#6
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Check the ears on the manifold.
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carfixer007 (02-25-2020)
#8
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I don't think a cracked manifold will cause this a P0411, unless it is cracked all the way off and on the ground in pieces.
A lot of folks are fixing this on these by replacing the one-way check valve.
A lot of folks are fixing this on these by replacing the one-way check valve.
#10