P0017 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.

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 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.

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.

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 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.