DTC Advanced Diagnostics: P0021: General Description

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

The variable valve timing control (VTC) system controls the phase of the intake camshaft and exhaust camshaft. It uses oil pressure to operate VTC actuator A/B so the valve timing is optimized depending on driving conditions. The powertrain control module (PCM) monitors the difference between the target camshaft position and the actual camshaft position. If the difference between them is excessive for a certain time period, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type