P0021 - "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

Description and meaning of DTC p0021

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Toyota, VW, Ford, Dodge, Honda, Chevrolet, Hyundai, Audi, Acura, etc. A P0021 code refers to the VVT (variable valve timing) or VCT (variable camshafttiming) components and the car's PCM (powertrain control module) or ECM (engine control module). VVT is a technology used in the engine to allow it to get greater power or efficiency at different running points. That consists of a few different components but the P0021 DTC specificallyrefers to the camshaft (cam) timing. In this case, if the cam timing is abovea set limit (over-advanced), the engine light will be illluminated and the codewill be set. The "A" camshaft is either the intake, left, or frontcamshaft. A P0021 engine code is basically the same as a P0011code, except this is for Bank 2, not Bank 1.

p0021 diagnostic trouble code symptoms

Most likely a P0021 DTC will result in one of the following: hard starting,poor idle, and/or stalling. There are potentially other symptoms as well. Ofcourse, when trouble codes are set, the MIL (malfunction indicator lamp, a. k. a. the check engine light) illuminates.

DTC p0021 - possible causes

A P0021 DTC trouble code may be caused by one or more of the following:Incorrect camshaft timingWiring problems (harness/wiring) in intake timing control valve controlsolenoid systemContinuous oil flow to VCT piston chamberFailed timing valve control solenoid (stuck open)

How to fix OBD-II diagnostic trouble code p0021

This DTC code is a result of a mechanical fault of the VCT unit or relatedcomponents, so there is no need for electrical diagnosis. Refer to vehicle specificrepair manual to perform component tests for the VCT unit. Notes: Dealer techshave advanced tools and the ability to follow detailed troubleshooting steps,including the ability to test components using a scan tool. Other related DTCs: P0010 - P0011 - P0012 - P0020- P0022

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