P0014 on Chevrolet

The 5.3L V8 with Active Fuel Management (AFM/cylinder deactivation) is prone to two linked failures: excessive oil consumption from worn piston rings and an AFM oil deflector that sprays oil at the cylinder walls, and collapsed/failed AFM lifters that can damage the camshaft. Burning oil fouls spark plugs and can trip low-oil shutdown commands; a failed lifter causes a ticking/knocking misfire. GM settled the Siqueiros class action ($150M) over the LC9 5.3L piston-ring defect for 2011-2014 vehicles built on/after Feb 10, 2011.

The water pump on the 3.6L V6 can fail, causing coolant leaks and potential overheating. The pump is driven by the timing chain, making replacement labor-intensive as it requires significant disassembly to access.

The 2.4L Ecotec engine is prone to premature timing chain failure due to improperly hardened chains and faulty tensioners. A defective batch of timing chains that were not hardened properly causes the chains to stretch prematurely. When the timing chain fails or jumps teeth on the sprockets, it can cause catastrophic valve damage and complete engine failure.

The 2.4L Ecotec in 2010-2017 Equinox is prone to premature timing-chain and balance-chain stretch, driven primarily by a collapsing chain tensioner and made worse by the engine's known oil-consumption problem (low oil reduces hydraulic pressure to the tensioner). Symptoms are a rattle at cold startup, a check-engine light, and rough running or loss of power. Because the engine is an interference design, a chain that skips timing far enough lets the valves contact the pistons, turning a maintenance item into an engine-destroying failure. GM issued Special Coverage Adjustment 12313D covering premature timing/balance chain wear on certain 2010-2011 2.4L engines.

The GM Ecotec 2.4L direct-injection engine suffers from timing chain stretch and plastic guide breakage. GM received a bad batch of chains that were not properly hardened. The plastic guides break causing the chain to sag, and since this is an interference engine, failure can destroy the engine. The 2.4L also burns oil excessively due to improperly hardened piston rings (2010-2013), leading to low oil which accelerates timing chain wear.

On the Gen V 5.3L L83 (and 6.2L L86) in the Silverado 1500, the timing chain can stretch and the VVT cam phasers/actuators can wear, causing the camshaft to drift out of correlation with the crankshaft beyond what the variable-valve-timing system can correct. This sets crank/cam correlation and VVT codes, a startup rattle (slack chain before oil pressure builds), rough idle, reduced power, and on higher-mileage trucks a risk of the chain jumping. AFM operation and extended oil-change intervals accelerate the wear. It is a more involved repair than a sensor because it requires removing the front timing cover.

Generation IV 5.3L Vortec engines burn an abnormal amount of oil — many owners report a quart or more every 1,000-2,000 miles. The defect is a combination of low-tension piston rings that fail to control oil, oil spray from the Active Fuel Management (AFM) system during cylinder deactivation, and a PCV path that draws oil mist into the intake. The oil fouls and prematurely wears spark plugs, causing rough idle, misfires, and a check-engine light. This was the subject of the Siqueiros v. GM class action (N.D. Cal., No. 3:16-cv-07244), which reached a final settlement in October 2025.

The turbocharged 2.7L Turbomax four-cylinder develops a metallic rattle/knock on cold start-up, most pronounced in the first few seconds before oil pressure builds. The root cause is premature wear in the turbocharger wastegate linkage/actuator, which can also throw a turbo-underboost code. Owners also report VVT camshaft-actuator (CPAS) solenoid faults and engine-harness chafing on this engine. Because the L3B is direct-injection only (no port injection), intake-valve carbon buildup compounds the rough-idle/misfire complaints as miles accumulate.

The 4.2L Atlas inline-six (LL8) used in the 2002-2009 GMT360 TrailBlazer has variable valve timing on the exhaust cam, controlled by an oil-fed camshaft position actuator solenoid mounted on the head behind the power steering pump. The solenoid screen clogs with oil varnish or the solenoid fails electrically, so the phaser will not hold commanded position. The PCM sets P0014 (exhaust cam timing over-advanced) or P0016 (cam/crank correlation) and the engine runs rough, idles poorly, and loses power. Owners also report the solenoid seeping oil down the back of the engine — it is the classic oil leak point on this engine. Note this is engine-code specific: it does not apply to the 5.3L V8 or the 6.0L SS.

The second-generation 3.6L LFY runs four cam phasers fed by oil-control solenoids. On early C1XX Traverse builds the solenoids stick or screen-clog with casting/machining debris and varnish, and the ECM calibration was itself part of the problem. The result is a set of correlated cam timing codes — commonly P0011 with P0014, P0021 and P0024 appearing together — plus a rough idle, a rattle on start-up as the phasers fail to lock, and reduced power. GM addressed the calibration side with bulletin N192266190 (ECM reprogram). This is distinct from the LLT/LFX timing chain stretch problem: the chains here are not necessarily worn, the phaser control is.