P0016 on Chevrolet: How to Diagnose & Fix

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.

GM's high-feature V6 in the Equinox suffers premature timing-chain stretch, distinct from the covered 2.4L chain issue. Worn chains/guides/tensioners throw off cam-to-crank timing, setting P0008/P0009 (engine position performance) and P0016-P0019 (crank/cam correlation). The classic symptom is a rattle or chain-slap on cold start from the front/passenger side of the engine. Long oil-change intervals and low oil accelerate the wear; left unfixed, a chain can jump time or break and bend valves.

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 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 3.6L V6 fitted to the 2015-2022 Colorado (LFX through 2016, LGZ from 2017) can suffer timing chain stretch and timing chain tensioner wear, showing up as a rattle on cold start that fades as oil pressure builds, a check engine light with cam/crank correlation or VVT position codes such as P0016, P0017 and P0018, rough running and lost power. Unlike the earlier high-feature V6s, the failures on the 2015-and-later engines are strongly correlated with oil neglect: extended intervals under the oil life monitor, running the engine low on oil, or using the wrong grade lets the hydraulically applied chain tensioners lose their bite. Forum consensus from Colorado owners is that trucks changed at around 5,000 miles rarely see it and neglected trucks see it well before 100,000. This is a V6 issue - do not attribute it to the 2.5L LCV, the 2.8L diesel, or the third-generation 2.7L turbo.

The 2.2L and 2.4L Ecotec engines in the HHR suffer from timing chain tensioner failure and chain stretch, particularly on early production years. The timing chain tensioner does not receive sufficient oil at idle due to a design fault in early engines, causing accelerated wear. The 2.4L Ecotec is especially prone to this issue and also suffers from oil consumption problems. GM released revised tensioners and oil nozzles but many HHRs were never updated. Symptoms typically appear between 80,000-120,000 miles.

The 2.2L (L61/LE5) and 2.4L Ecotec four-cylinders are prone to timing chain wear caused by failing plastic guides and weak tensioners, often aggravated by extended oil-change intervals or low oil. Because the engine is an interference design, a stretched chain that jumps time can let pistons strike valves and destroy the engine. The telltale sign is a rattling or scraping noise from the passenger side of the engine, especially on cold start, frequently accompanied by code P0008/P0017 for cam-to-crank correlation.

The 2.2L and 2.0L Ecotec engines in the Cobalt develop timing chain stretch and timing chain guide deterioration. The plastic timing chain guides wear over time, causing the chain to become slack and noisy. If left unaddressed, the timing chain can skip teeth, causing valve timing misalignment and potential engine damage. The issue typically develops between 80,000-150,000 miles. The water pump is driven by the timing chain on these engines, so both should be addressed together.

Timing chain tensioner fails allowing chain to slap and jump timing. 2.5L V6 particularly susceptible. Can cause valve damage if chain jumps more than one tooth.

The 2.5L Suzuki V6 engine has a hydraulic timing chain tensioner that leaks down overnight, causing a loud rattling noise on cold startup. If the tensioner fails completely, the timing chain can jump and cause valve-to-piston contact, bending valves and potentially destroying the engine.

The 3.6L direct-injected V6 used in fifth-generation Camaro is known for timing chain wear/stretch that can trigger cam/crank correlation faults, rough running, and reduced performance. GM issued service information and special coverage on related 3.6L timing chain concerns across multiple applications, and Camaro owners have documented the same issue in forums and complaints. Poor oil maintenance tends to accelerate wear because chain life is sensitive to lubrication quality and oil change intervals.

The 3.6L V6 (LLT and LFX variants) in the first-generation Traverse is notorious for premature timing chain stretch. The engine uses three timing chains — one primary and two secondary chains driving the variable valve timing actuators. The chains stretch beyond the tensioner capacity, causing the engine timing to slip. Symptoms progress from a rattle on cold start to a check engine light with camshaft correlation codes. If ignored, the stretched chains can skip teeth, causing catastrophic engine damage. The issue typically manifests between 80,000-120,000 miles.

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.

The 3.6L high-feature V6 offered in the 2008-2012 Malibu — LY7 on the earliest cars, LFX later — uses three chains and plastic-faced tensioner shoes. The original chain and tensioner design wears prematurely, aggravated by GM's oil-life-monitor service intervals that let owners run 10,000+ miles on degraded oil. As the guides wear the chain goes slack, cam timing drifts out of the correlation window, and the ECM sets P0008 or P0016-P0019. Left alone the chain can skip a tooth on a cold start and the pistons will contact the valves. This is a completely different failure from the 2.4L four-cylinder chain issue and must not be merged with it: the V6 is a three-chain, rear-of-block-access design, the labor is far heavier, and the symptom onset is a rattle on cold start rather than the 2.4's oil-consumption-driven wear.

Distinct from the primary timing chain failure on the same engine: the 2.4L Ecotec LAF uses a second, smaller chain driving the balance shaft assembly in the lower crankcase. GM found the chrome plating on the balance chain's link pins was applied too thin on 2010-2011 production, so the pins wear rapidly, the chain stretches and slaps, and it can eventually break and drop into the oil pan. Owners report a rattle or growl from the lower front of the engine, often loudest at idle and light throttle, that is frequently misdiagnosed as the timing chain. Because the balance chain runs off the same crank sprocket area, a stretched or jumped balance chain can also set cam/crank correlation codes and, once the chain lets go, debris circulates through the oil pump pickup. Forum teardowns on 2009-2013 Malibus routinely show worn balance chain guides and sprockets alongside intact-looking timing components, and some cars come apart with the balance chain missing entirely.

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.

Certain 6.2L L87 V8 engines left the factory with manufacturing defects in the connecting rods and/or crankshaft — sediment/debris left in the crankshaft oil galleries and out-of-spec crankshaft finish starve the rod bearings of oil. The bearings spin, the rod can knock or seize, and the engine can suffer a sudden loss of propulsion at speed. This is the subject of a large 2025 safety recall covering roughly 600,000 U.S. trucks and SUVs (Silverado 1500, Tahoe, Suburban, Sierra 1500, Yukon, Escalade).

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.

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.

Gen IV 5.3L AFM engines burn oil at an abnormal rate — many owners report consuming roughly a quart every 1,000-2,000 miles with no external leak. The accepted root cause is a combination of GM's low-tension piston rings plus the AFM system spraying oil onto the cylinder walls during cylinder deactivation; oil gets past the rings and is burned in the combustion chamber. The PCV system and carboned-up rings compound it. The chronic low oil level then accelerates the AFM lifter failures these engines are also known for. This was the subject of a high-profile class-action (Sloan v. GM / Siqueiros) covering Gen IV 5.3L AFM trucks, and it is one of the most-searched Silverado complaints.

GM recalled roughly 597,630 trucks and SUVs (NHTSA recall, 2025) — including 2021-2024 Silverado 1500 with the 6.2L L87 V8 — for connecting rods and/or crankshafts that may have manufacturing defects (debris in oil passages or out-of-spec parts). Affected engines can seize or knock and suddenly lose propulsion, with documented fire and crash allegations. GM's tally tied to the recall logged about 28,000 complaints, including ~14,300 alleging loss of propulsion. The remedy splits vehicles into two groups: those that fail inspection get a full engine replacement, while those that pass switch from 0W-20 to thicker 0W-40 oil plus a revised service procedure. NHTSA opened a follow-up engineering analysis into post-recall L87 failures, and a class action is pending — this is currently the highest-profile, highest-demand Silverado issue.

L87 6.2L V8s built March 1, 2021 through May 31, 2024 can suffer sudden rod-bearing failure and engine seizure with loss of propulsion. GM attributes it to supplier manufacturing/quality issues — sediment/debris left on connecting rods and in crankshaft oil galleries plus out-of-spec dimensions — that starve and pound the rod bearings. NHTSA safety recall 25V-274 (April 2025) covers 44,802 Tahoes among ~600k GM full-size trucks/SUVs; GM logged over 14,000 field complaints and a dozen alleged crashes/injuries. NHTSA has since opened follow-up query RQ26001 into failures on engines outside the recall and on some units that failed after the dealer remedy.

Gen V 5.3L engines use variable valve timing (VVT) with a cam phaser and VVT solenoid. Sludge and wear cause the phaser to rattle and the timing chain to stretch, producing a cold-start 'marbles in a can' rattle that often precedes a check-engine light. It sets crank/cam correlation codes (P0008/P0016/P0017) or VVT performance codes (P0011). GM TSB PIP5921B also documents a rattle/tick from the intake cam actuator when its cover-plate screws back out. Ignored, a stretched chain can jump timing and cause severe internal damage.

The first-design hydraulic timing chain tensioner on the L61 Ecotec does not get adequate oil pressure at idle, particularly on cars that see extended oil-change intervals. The tensioner wears or sticks, the chain goes slack, and it slaps the guides. Left alone the guides break up and the chain jumps a tooth or more. The L61 is an interference engine, so a jumped or broken chain bends valves and typically ends the engine. This is specific to the 2002-2005 DOHC Ecotec Cavalier and does not apply to the earlier 2.2L OHV pushrod engine, which uses a much shorter, far more durable chain.

The 2.4L LD9 Twin Cam used in the 1996-2002 Cavalier Z24 (and RS/LS 2.4) runs a long chain to two overhead camshafts with plastic-faced guides and a hydraulic tensioner. Skipped or extended oil changes coke the tensioner and accelerate guide wear; the tensioner sticks, the chain develops slack, cam timing drifts and the car misfires or will not start. Like the later Ecotec, the LD9 is an interference design, so a chain that jumps far enough contacts valves. Note this is a different engine and a different chain system from the 2.2L Ecotec - the 1995 Z24 used the 2.3L Quad 4 and is not part of this pattern.

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.