OBD-II Code · Powertrain
P0015
"B" Camshaft Position - Timing Over-Retarded (Bank 1)
Exhaust cam on bank 1 is more retarded than commanded.
Common symptoms
- CEL
- Power loss
- Emissions failure risk
Likely causes
- Stuck exhaust phaser
- Sludged oil
- Failed OCV
- Worn timing components
Where to start
- Try the cheapest cause first. Start by checking: stuck exhaust phaser.
- Cost & scope. $150-$1,200
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
Read the full diagnostic procedure
Bank 1 EXHAUST camshaft is mechanically OVER-RETARDED — exhaust cam won't advance off park, or falls back to retard under command. Cheapest-first ladder: (1) Live-data commanded vs actual exhaust cam angle at 2500 rpm warm — if commanded climbs to 15-25 degrees advance but actual stays near 0, the OCV isn't routing oil or the phaser is stuck. (2) Swap the exhaust OCV with a known-good unit and recheck — quickest way to isolate solenoid vs phaser. (3) Clean the OCV screen. (4) Verify hot oil pressure — minimum 10 psi idle. Don't replace the exhaust cam phaser before testing the OCV — exhaust OCVs fail more often than exhaust phasers do, and they're a 30-minute, $80 fix versus a 5-hour, $1,200 fix.
Vehicle-specific patterns
Vehicle-specific patterns: 2007-2016 Toyota Camry/Sienna/Highlander 2GR-FE — exhaust OCV failure is the #1 cause, updated part 15330-31040 with finer screen. 2010-2014 Hyundai Sonata/Optima 2.4L Theta II GDI — exhaust OCV failure combined with timing chain stretch, often pairs P0015 with P0016. 2011-2016 Ford F-150 5.0L Coyote — exhaust phaser failure mode is stuck-retarded on bank 1, replace phaser pair. 2008-2015 Mitsubishi Lancer/Outlander 2.4L 4B12 — known OCV connector corrosion, repin or replace harness pigtail. Estimated repair: $60 to $1,600.
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