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P0015: “B Camshaft Position – Timing Over-Retarded (Bank 1)

🔍 Meaning

🌹 The ECM (Engine Control Module) detects that the exhaust camshaft timing is more retarded (delayed) than commanded.
It means the camshaft is not moving or reacting properly when the ECM tries to advance or retard it.

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⚙️ Possible Causes

1. Dirty or low engine oil (most common)

2. Faulty VVT solenoid / oil control valve (OCV) for Bank 1 exhaust cam

3. Clogged oil passage in the VVT system

4. Stretched or misaligned timing chain/belt

5. Faulty camshaft position sensor (Bank 1, exhaust)

6. Wiring issue – open, short, or poor connection to camshaft actuator

7. ECM fault (rare)

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🧰 Diagnostic Steps

1. Check engine oil

➡️Verify correct oil level, viscosity, and cleanliness.

➡️Replace oil and filter if dirty or due.

2. Inspect VVT solenoid (OCV)

➡️Disconnect and check resistance with a multimeter (usually 6–12 Ω).

➡️Apply 12V and see if solenoid clicks or actuates.

➡️Remove and clean with carb cleaner if clogged.

3. Scan live data

➡️Use a scan tool to watch desired vs actual cam angle while revving engine.

➡️If the cam doesn’t respond — the actuator or solenoid may be stuck.

4. Inspect timing chain alignment

➡️If solenoid is working but timing stays retarded, check chain stretch or slipped timing.

5. Check wiring & connectors

➡️Look for oil intrusion, corrosion, or broken pins at VVT solenoid and cam sensor.

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🧯 Common Fixes

✅ Change engine oil & filter (use manufacturer-specified grade)
✅ Clean or replace VVT solenoid
✅ Check and clean oil passages
✅ Replace stretched timing chain and tensioner if needed
✅ Replace faulty camshaft position sensor

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⚠️ Tip

🙏 If you’re working on brands like Toyota, Honda, Hyundai, or GM, these codes often come up due to dirty oil or a sticky VVT solenoid.
Cleaning and oil service often fixes it.