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<blockquote data-quote="AllTerrain1025" data-source="post: 22875" data-attributes="member: 8486">My daughter recently got an original owner 2012 Nox with 192K miles on it. It started doing the reduced engine power / service Stabilitrak accompanied by a P2138 code. I replaced both the gas pedal and throttle body thinking that doing both sides of the signal would fix the issue. Took it on a test drive and it keeps throwing the same code. The original owner had a ton of service records and the one thing I did not see being done was the timing chain. It does sound like there is starting to be some slap from it when it is idling, along with a bit of a lumpy idle. When she first got the vehicle I replaced the high pressure fuel pump, plugs, and coils as part of a major tune up. What are everyone's thoughts? I know the timing chain is on the menu, but I do not see why that would cause a P2138 to keep showing up. Are there any other parts besides the pedal and throttle body that could close the loop on that code that I am not thinking of?Any help is appreciated.</blockquote>

[QUOTE="AllTerrain1025, post: 22875, member: 8486"] My daughter recently got an original owner 2012 Nox with 192K miles on it. It started doing the reduced engine power / service Stabilitrak accompanied by a P2138 code. I replaced both the gas pedal and throttle body thinking that doing both sides of the signal would fix the issue. Took it on a test drive and it keeps throwing the same code. The original owner had a ton of service records and the one thing I did not see being done was the timing chain. It does sound like there is starting to be some slap from it when it is idling, along with a bit of a lumpy idle. When she first got the vehicle I replaced the high pressure fuel pump, plugs, and coils as part of a major tune up. What are everyone's thoughts? I know the timing chain is on the menu, but I do not see why that would cause a P2138 to keep showing up. Are there any other parts besides the pedal and throttle body that could close the loop on that code that I am not thinking of? Any help is appreciated. [/QUOTE]

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