Timing-related check engine codes—like P0016, P0017, P0340, or P0341—mean your engine's computer has detected that the relationship between crankshaft and camshaft positions is off. Engine timing is precise to fractions of a degree, and even minor deviations cause power loss, rough running, and poor fuel economy. The underlying cause can range from a worn timing chain or failed VVT actuator to low oil pressure starving the timing system. In interference engines—which includes many modern 4-cylinders—a jumped timing chain can cause pistons and valves to collide, resulting in catastrophic engine damage that's far more expensive than a timing chain service.
Timing fault codes require both scan tool analysis and mechanical inspection to diagnose correctly. We check VVT actuator function, cam sensor signal quality, oil pressure to the timing system, and physically measure chain stretch. The repair depends on what's actually causing the timing error—some cases are solvable with an oil flush that clears sludge from VVT passages; others require a full mechanical timing service. We always verify the root cause before recommending parts. Learn more about our Timing Chain Replacement service.
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Codes like P0016, P0017, P0340, or P0341 tell your engine computer that the relationship between the crankshaft and camshaft positions is off. Engine timing is precise to fractions of a degree—even small deviations cause rough running, power loss, and poor fuel economy. The underlying cause can be mechanical (worn chain) or electrical (failed cam sensor, VVT actuator).
Cautiously and briefly. A P0016 or P0017 correlation code means timing is off enough that the computer detected it—which means performance and fuel economy are already affected. In interference engines, a chain that's jumped a tooth is inches away from catastrophic valve contact. We recommend prompt diagnosis, not driving until a convenient time.
Scan tool data alone isn't enough—codes point toward the timing system, but the cause (stretched chain, failed VVT solenoid, low oil pressure, clogged VVT passages, bad cam sensor) requires both electronic and mechanical inspection. We check all of these before recommending parts.
These are the most common reasons drivers experience this symptom.
A stretched chain shifts the cam-to-crank timing relationship, triggering correlation fault codes.
A failing camshaft position sensor sends incorrect timing signals to the ECM.
Variable valve timing actuators or solenoids can fail and trigger timing-related codes.
Not sure if this is your issue? Browse other common problems we fix.
Contact Scott's Auto and Clutch today for honest service and expert repairs.
144 W Crystal Ave, South Salt Lake, UT 84115