P0021 KIA - 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2
P0021 KIA Possible Causes
- Dirty Oil
- Low engine oil level
- Faulty Valve Timing Control (VTC)
- Valve Timing Control (VTC) harness is open or shorted circuit.
- Valve Timing Control (VTC) circuit poor electrical connector
- Incorrect timing
- Engine mechanical problems
- Damaged Engine Control Module (ECM)
How do I fix code P0021 KIA?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The bulletin provides information on how to inspect and diagnose problems related to the Oil Control Valve (OCV) used in Constant Variable Valve Timing (CVVT), if at any time the OCV is suspected as the caused of rough idling, poor acceleration, camshaft timing misalignment-related trouble codes, misfire-related trouble codes.
Bulletin: Kia Constant Variable Valve Timing Oil Control Valve Inspection
Cost of diagnosing the P0021 KIA code
Labor: 1.0The cost of diagnosing the P0021 KIA code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle
P0021 KIA MeaningThe CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the exhaust camshaft. There is no variation in valve timing of the exhaust cam because the exhaust camshaft is driven by the timing belt. The timing of the intake cam is varied by the relative operation the CVVT vane to the housing. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV (Oil Control Valve). As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease by changing the valve open/close timing of the intake camshaft.
The deviation of the camshaft position from the target point is evaluated during stable driving condition. The Engine Control Module (ECM) accumulates this deviation for a certain period and sets DTC P0011 when the accumulated deviation is too high. The target camshaft position is predetermined value depending on engine speed and throttle angle in the ECM.
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