P0018 Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor A

P0018 points to crankshaft and camshaft position correlation on bank 2 sensor A. The controller sees timing relationship outside expected limits.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace sensors only because correlation is flagged; verify mechanical timing and VVT control first.

Symptoms of P0018

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0018

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Compare crank and bank 2 cam sensor signals, commanded cam timing, actual cam angle, and freeze-frame RPM and load data.
Inspect timing chain or belt alignment, cam phaser operation, oil condition, VVT solenoid control, sensor connectors, and reluctor condition.
Check for recent timing work, chain stretch symptoms, oil pressure problems, and companion cam timing or misfire codes.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.