![]() If the oil is sludged up or an oil with a higher viscosity is in the engine, then it could cause the camshaft VVT to not work as designed. The engine oil passages through the camshafts the oil control valves are of small size and require only the manufacturer's recommended oil viscosity to be used. Replacing the camshaft oil control valve for bank 2 intake camshaftĬhecking the timing chain and camshaft phasersĪdditional comments for consideration regarding the P0021 code Repairing or replacing the wiring to the camshaft oil control valve for bank 2 intake camshaft The fuel consumption may increase and carbon fouling of engine components may occur.Ĭlearing the Check Engine Light codes and road testing to verify the codeĬhanging the oil and filter to the proper oil viscosity for the engine specifications The engine may run erratically and have various drive complaints that could cause unsafe driving conditions if the engine hesitates or stalls. Verify the failure code is active by clearing and retesting the code.įollow pinpoint tests step-by-step without skipping any steps. Common mistakes when diagnosing the P0021 codeįollow these simple guidelines to help prevent misdiagnosis:ĭo a visual inspection for problems, like checking to see if all electrical connectors are connected, or harness is damaged.Ĭheck engine oil to see if it is full, clean and of the correct viscosity. Note: The manufacturer's pinpoint test will be different for different engines and year of manufacturer. Performs the manufacturer's pinpoint tests for the P0021 code Scans and documents the codes then views the freeze frame data to see when the code was setĬlears the OBD-II fault codes and retests the vehicle to see if the P0021 code comes back Visually inspects for damaged wiring or connectorsĬhecks the engine for sludge and for the engine to be full of clean engine oil with the correct viscosity How does a mechanic diagnose the P0021 code? Note: The symptoms may change depending on the camshaft timing positions when the camshaft stopped advancing or retarding. The engine emissions may exceed federal levels. The engine may idle normally but can hesitate or stall on acceleration.Ī reduction in fuel mileage may happen due to the camshafts not being at an optimal position. The ECM will turn on the Check Engine Light. The camshaft phaser is stuck in the advanced position. This can be from the wrong oil or lack of oil changes. The oil is too thick, causing the passages to become clogged. The Oil Control Valve (OCV) connected to the bank 2 camshaft may be stuck or have clogged oil passages. The camshaft is more advanced when it has been commanded to retard to a lower timing level. The camshaft is more advanced than the ECM has commanded it to advance. This over advanced condition could be during advancing, or retarding of the camshaft timing. P0021 is the OBD-II generic code indicating that the Engine Control Module (ECM) has determined that the bank 2 intake camshaft is more advanced than what the ECM has commanded it to be. These DTCs indicate that the VVT controller cannot operate properly due to a camshaft timing oil control valve assembly (for intake camshaft) malfunction or the presence of foreign matter in the camshaft timing oil control valve assembly (for intake camshaft).Camshaft Position A - Timing Over-Advanced or System Performance (Bank 2) What the P0021 code means It takes 5 seconds or more to change the valve timing by 5Â☌A (Condition "A").Īfter the above condition is met, the camshaft timing oil control valve assembly (for intake camshaft) is forcibly activated for 60 seconds (Condition "B").ĭTC P0011 (Advanced Camshaft Timing) is subject to 1 trip detection logic.ĭTC P0012 (Retarded Camshaft Timing) is subject to 2 trip detection logic. If the difference between the target and actual intake valve timing is large, and changes in the actual intake valve timing are small, the ECM interprets this as a VVT controller stuck malfunction and stores a DTC.Ī DTC is stored when the following conditions "A" and "B" are met: The VVT controller can advance or retard the intake camshaft. This control signal regulates the oil pressure supplied to the VVT controller. ![]() ![]() The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve assembly (for intake camshaft). The VVT system includes the ECM, camshaft timing oil control valve assembly (for intake camshaft) and VVT controller (camshaft timing gear assembly). The ECM optimizes the intake valve timing using the Variable Valve Timing (VVT) system to control the intake camshaft.
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