If anyone is interested, there is a TSB about this: 16NA241
From the summary "THIS TECHNICAL BULLETIN PROVIDES A PROCEDURE TO CHECK THE CYLINDERS FOR DAMAGED PISTONS AND DETERMINE IF THE USE OF AFTERMARKET CALIBRATIONS OR PERFORMANCE PARTS MAY BE THE CAUSE."
Subject: Engine Misfire, Ticking/Knocking Noise, No Compression due to Piston Damage, Malfunction Indicator Lamp (MIL) Illuminated
Brand: Model: Model Year: VIN:
from to from to
Buick Encore 2013 2017
Regal 2011 2017
Verano 2013 2016
Cadillac ATS 2013 2017
Escalade 2007 2017
CT6 2016 2017
CTS 2007 2017
Chevrolet Avalanche 2007 2013
Camaro 2009 2017
Colorado 2007 2017
Corvette 2007 2017
Cruze 2011 2017
Malibu 2013 2017
Silverado 2007 2017
Sonic 2012 2017
Suburban 2007 2017
Tahoe 2007 2017
Trax 2013 2017
Low Cab Forward Medium Duty
3500/4500
2016 2016
GMC Canyon 2007 2017
Sierra
Yukon
HUMMER H2 2007 2011
ENGINE: L20, L76, L77, L83, L86, L92, L94, L96, L9H, LC8, LC9, LE2, LH6, LH8, LH9, LS2, LS3, LS7, LS9, LT1, LT4, LV3, LY2, LY5, LY6 LZ1, LFA, LFV, LHU, LMF, LMG, LTG, LUJ, LUV
Involved Region or Country North America and N.A. Export Regions
Condition Some customers may comment on the following conditions:
Malfunction Indicator Light (MIL) illuminated.
Engine misfire.
Engine ticking/knocking noise.
The Technician may find no compression on the misfiring cylinder(s) with 100% leakage into the crankcase.
Cause This may be caused by an aftermarket ECM calibrations/components and detonation, that lead to a melted piston.