P0024

P0024 indicates the exhaust camshaft on Bank 2 is timed more retarded than the ECM commanded, with the actual position lagging the desired position by more than approximately 5 to 8 crank degrees for a sustained window (typically 8 to 10 seconds at steady RPM). Start the diagnostic ladder at the cheapest end: pull the oil cap and inspect for sludge or milkshake, then check oil level and confirm the correct viscosity is in the sump because the variable cam timing (VCT) phasers are hydraulic actuators that stall on thin, contaminated, or low-pressure oil. Next, scan live data and watch Bank 2 exhaust cam desired-versus-actual at 2,500 RPM under no load; a healthy phaser should sweep within 2 crank degrees of commanded and slew the full 40 to 50 degree authority in under 1.5 seconds. If the actual flatlines or oscillates more than 4 degrees off-target, ohm the Bank 2 exhaust oil control valve solenoid (spec is typically 6.9 to 7.9 ohms at 68F) and inspect the screen for ferrous debris before condemning the phaser itself. The expensive misdiagnosis here is replacing the phaser/sprocket assembly ($800 to $1,400 in parts plus 4 to 8 hours labor) when the actual failure was a $40 OCV with a clogged inlet screen or a worn timing chain.

Vehicle-specific patterns: 2007-2014 Ford 5.4L 3V Triton trucks (F-150, Expedition, Navigator) are the textbook case here — the Bank 2 exhaust phaser sticks because oil-change intervals stretched past 7,500 miles let varnish lock the helical splines, and the symptom is a cold-start rattle that lasts 2-4 seconds followed by P0024 at operating temp. 2008-2012 Nissan Altima/Maxima with the VQ35DE throw P0024 when the Bank 2 exhaust cam solenoid filter packs with sludge. 2006-2010 BMW N52 inline-six (328i, 528i, X3) sets P0024 from a failing Vanos exhaust solenoid where the o-rings harden and bleed control pressure. 2005-2009 Toyota 2GR-FE V6 (Camry, RAV4, Avalon) is rarer but does it via a stuck Bank 2 exhaust OCV after long highway-only duty cycles. Estimated repair: $180 to $2,800.