P0016 means the crankshaft and intake camshaft on Bank 1 are not in the correct rotational relationship. The ECU detects that camshaft position deviates from what it commanded based on crankshaft position. Causes range from low oil level to timing chain stretch.
P0016 is a ignition-related diagnostic trouble code classified as high severity. When your vehicle's ECU detects this condition, it stores P0016 and illuminates the check engine light.
