As a byproduct of this technology, combustion efficiency can be adjusted as necessary in real-time. Variances in camshaft timing, achieved through the use of cam phasers, impact the actuation of an engine’s intake and exhaust valves. This, in turn, allows for additional rotational movement of an engine’s camshaft, outside of that applied by the timing chain. These phasers change the orientation of each corresponding camshaft, by applying or reducing the volume of oil applied to individual lobes of an internal rotor. More specifically, this code implies that the timing of an engine’s bank-2 camshaft has reached a state of consistency over advancement.Įngines that utilize VVT or VCT (ie: VTEC, VVTI, etc.) modify the timing of each camshaft through the use of a specialized cam phaser. "A" Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)ĭiagnostic trouble code P0021 applies to vehicles that feature Variable Valve Timing (VVT), or Variable Camshaft Timing (VCT). Aside from an obvious check engine light, fault code P0021 can present a wide array of secondary issues that often tend to negatively impact engine performance. This fault is largely indicative of camshaft position over advancement, specific to an engine’s second bank. Of these issues, few are as common as those related to diagnostic trouble code P0021. Unfortunately, technology of this nature does pose occasional issues. Many engines now feature Variable Valve Timing (VVT) or Variable Camshaft Timing (VCT), which advances or retards the orientation of an engine’s camshaft, based on relevant timing requirements. One such function, which is electronically interfaced to a heavy degree, is that which pertains to engine timing. Much advancement of this type has arisen out of the industry’s need to meet increasingly stringent, government-mandated emissions standards. Many of a vehicle’s functions, which were once static by design, are now variable under systematic computer control. Automotive technology has progressed significantly over the past several decades.
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