P0011

Bank 1 intake camshaft is mechanically OVER-ADVANCED — the PCM commanded the phaser to a target angle (say 20 degrees advance) and the cam position sensor reports the cam actually moved further than commanded, or won't return to park. This is a mechanical/hydraulic code, not electrical. Cheapest-first ladder: (1) Pull live data and watch commanded vs actual cam angle at idle warm — they should track within 2 degrees; if actual lags or overshoots by 5+ degrees, the phaser or oil supply is the issue. (2) Check oil level AND viscosity — wrong-weight oil (5W-30 in a 0W-20 spec engine) is the #1 P0011 cause, the phaser can't bleed off pressure fast enough. (3) Pull the OCV and clean the screen — varnish on the inlet screen restricts return flow and the phaser stays advanced. (4) Verify oil pressure at idle hot — minimum 10 psi at idle, 40+ psi at 2500 rpm; low pressure means the phaser hydraulics can't respond. Don't replace the camshaft phaser ($400-$900 part plus 4-6 hours labor) until you've done an oil change with correct viscosity, cleaned the OCV screen, and verified oil pressure — 60% of P0011 cases clear with those three steps.

Vehicle-specific patterns: 2003-2012 Honda Accord/Odyssey/Pilot J35 V6 and 2006-2011 Civic/CR-V K24 — VTC actuator (the bolt-on phaser at the front of the intake cam) wears internally and rattles on cold start for 1-2 seconds before throwing P0011; updated VTC actuator part number 14310-R44-A01 is the fix. 2007-2016 Toyota Camry/Highlander/Sienna 2GR-FE V6 — OCV inlet screen clogs, TSB-0192-09 covers the screen cleaning procedure as the first repair. 2008-2014 Subaru Impreza/Forester/Outback EJ25 — AVCS sprocket internal spring fails, the cam can't return to base timing, replace the AVCS assembly (sold as a unit). 2007-2013 Nissan Altima/Maxima VQ35 — secondary timing chain guide cracks and the chain skips a tooth, throwing P0011 with a rattle at startup; this is the expensive one, full timing chain job. Estimated repair: $60 to $1,800.