Chevy did resolve this as a Factory Warranty, you would have to take it to the dealer TSB # PIP3423K
Here a copy of the bulletin that was produced
# PIP3423K: DTC P0016 P0017 P0018 P0019 P0008 P0009 - (Mar 28, 2014)
Subject: DTC P0016 P0017 P0018 P0019 P0008 P0009
Models: 2013-2014 Cadillac ATS XTS
2004-2014 Cadillac CTS SRX
2004-2011 Cadillac STS
2005-2009 Buick Allure (Canada Only)
2005-2014 Buick Lacrosse
2008-2014 Buick Enclave
2007-2014 GMC Acadia
2010-2014 Chevrolet Camaro
2008-2014 Chevrolet Equinox
2012-2014 Chevrolet Impala
2008-2012 Chevrolet Malibu
2009-2014 Chevrolet Traverse
2007-2009 Pontiac G6
2008-2009 Pontiac G8, Torrent
2007-2010 Saturn Aura, Outlook
2008-2010 Saturn Vue
with 2.8L LP1, 2.8 LAU, 3.0 LF1, LFW 3.6L LY7, LLT, LFX engines
This PI was superseded to update models and model years. Please discard PIP3423J.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Vehicles with 2.8 LP1, 2.8 LAU, 3.0 LF1, 3.0 LFW, 3.6 LFX, 3.6 LLT, or 3.6 LY7 engines may exhibit two or more of the following DTCs: P0016, P0017, P0018, P0019, P0008 or P0009.
Recommendation/Instructions
If the above concern is present, check for loose timing chains or tensioners.
If after following SI diagnostics the root cause is not found, the following may be helpful.
The reluctor for the crankshaft sensor pressed on the crankshaft may have moved.
Refer to attached photographs for exact location.
(It is possible on some applications to view this with a bore scope through the crank sensor hole without removing the oil pan)
If the reluctor has moved then replace crankshaft.
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