P0011 — A Camshaft Position Timing Over-Advanced or System Performance (Bank 1)
P0011 sets when the Bank 1 intake (or A) camshaft is over-advanced relative to the crankshaft beyond the calibrated limit. Oil and solenoid verification before expensive phaser or chain work prevents the most costly misdiagnosis on VVT-equipped engines. Always start with an oil change using the correct viscosity and a quality filter.
Fault Overview
Low oil pressure or incorrect oil viscosity, stuck VVT solenoid (oil control valve), clogged oil control passages, failed VVT actuator (phaser), stretched timing chain, and incorrect oil filter are the primary causes. Low oil level or delayed oil pressure on cold start is a common trigger. On some engines a stretched chain will set P0011 along with correlation codes.
Engine & Platform Coverage
Symptoms
- •P0011
- •camshaft timing over advanced
- •VVT over advanced
- •cam timing code
- •P0011 Honda
- •P0011 Toyota
Possible Causes
- 1.Low oil pressure or incorrect oil viscosity
- 2.Stuck VVT solenoid (oil control valve)
- 3.Clogged oil control passages
- 4.Failed VVT actuator (phaser)
- 5.Stretched timing chain
- 6.Incorrect oil filter
Wiring & Circuit Notes
VVT solenoid connector and control circuit. CMP and CKP circuits for correlation.
DVOM Specs & Sensor Tests
Cam/crank correlation data. VVT solenoid resistance and current. Oil pressure. Actual vs desired cam angle.
Diagnostic Flow — FSM Sequence
AI Diesel Tech enforces this evidence-gate sequence. Each gate must pass before advancing.
5 steps locked behind Technician Mode- 1Step 1 — Verify Oil Level, Condition, and Viscosity: Verify oil level, condition, and viscosity. Use the OEM-specified viscosity. Perform an oil change if overdue or incorrect.
- 2Step 2 — Check Actual vs Desired Cam Position: Check actual vs desired cam position on the scan tool. Confirm the cam is over-advanced relative to the target.
- 3Step 3 — Command the VVT Solenoid and Monitor Response: Command the VVT solenoid and monitor cam position response. A stuck solenoid will not move the cam.
- 4Step 4 — Measure Oil Pressure: Measure oil pressure with a mechanical gauge. Low pressure prevents the VVT system from operating correctly.
- 5Step 5 — Inspect and Clean the VVT Solenoid and Screens: Inspect and clean the VVT solenoid and oil control screens. Sludge is a common cause of solenoid sticking.
- 6Step 6 — Evaluate Timing Chain and Phaser if Oil and Solenoid Are Good: Evaluate the timing chain and phaser only if oil, solenoid, and oil pressure are all proven good.
Unlock the full evidence-gated diagnostic sequence, DVOM test steps, and repair procedures in Technician Mode.
Full Diagnostic Access
Verification steps, preventative measures, severity guidance, and legacy comparison are available in Technician Mode.
Typical Repair Costs
Oil change $40–100; replace VVT solenoid $80–400; clean passages $100–300; replace phaser $300–1,000; replace timing chain $800–2,000+.
Related Codes & Pages
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Summary
Use the AI Diesel Tech diagnostic engine to run this code through a structured, evidence-gated sequence and get a confirmed root cause before any parts are replaced.