Code P0014 on the 2024 Nissan Altima indicates the exhaust camshaft timing for Bank 1 is more advanced than the ECM commanded. Nissan's Variable Valve Timing Control (VVTC) system adjusts camshaft timing for optimal performance, and P0014 signals that the exhaust cam isn't responding correctly to commands.
Nissan VVT System
Nissan's VVTC system uses oil pressure-operated phasers on the camshafts to advance or retard valve timing. The system optimizes timing throughout the operating range for power, fuel economy, and emissions. The ECM monitors camshaft position sensors to verify timing matches commands.
Over-Advanced Exhaust Timing
When exhaust valve timing is over-advanced, exhaust valves open earlier than intended. This affects combustion chamber scavenging, can cause rough idle, reduced power, decreased fuel economy, and potential valve timing interference depending on severity.
Common Causes
Low or dirty engine oil is the primary cause - the VVT system requires adequate clean oil for proper phaser operation. The VVT solenoid (oil control valve) can fail or become clogged with sludge. The phaser itself may have internal issues. Stretched timing chain affects overall timing system operation.
Diagnostic Approach
Start with oil level and condition check. Monitor commanded versus actual exhaust cam timing using a scanner. Test VVT solenoid operation and check for restricted oil flow to the timing components. Verify timing chain condition hasn't affected the phaser operation.