P0011“A” Camshaft Position — Timing Over-Advanced (Bank 1)
Get it checked soon
What it means
Your engine adjusts camshaft timing on the fly — variable valve timing — using oil pressure metered through a control solenoid. P0011 means the intake cam on bank 1 is further advanced than the computer asked for, or is responding too slowly. Because the whole system runs on engine oil, oil problems are the first suspect.
Is it safe to drive?
Get it checked soon
Usually drivable, but VVT faults bring rough idle, stalling, weak power, and worse economy — and if the root cause is oil starvation or a tired timing chain, ignoring it risks genuinely expensive damage. Check the oil today and book the diagnosis soon. If the engine rattles on cold start, treat it with more urgency.
Common causes
Most likely first.
- Low, dirty, or wrong-viscosity engine oil — check this before anything else
- A sticking or failed VVT oil-control solenoid
- Sludge blocking the small oil passages that feed the cam phaser
- A worn cam phaser (the actuator on the end of the cam)
- A stretched timing chain or weak tensioner
What the live data shows
On the standard PIDs you see the side effects: unstable idle RPM, timing advance behaving oddly, and sometimes shifted fuel trims. The freeze-frame narrows it down — a fault set cold leans toward oil flow and the tensioner, a fault at full temperature leans toward the solenoid or phaser. Checking oil level and condition is diagnostic step one regardless of what the data says.
A scanner that reads all 139 standard sensors shows you these readings live. ScanMyCar charts them as you drive, keeps the freeze-frame stored with the code, and pulls codes from every module — free, with any cheap Bluetooth adapter.
Typical fixes
Cheapest first, where honesty allows.
- Check the oil level and change the oil to the correct viscosity — cheap, and often the fix
- Replace the VVT oil-control solenoid for that cam
- Flush or de-sludge if the engine's service history suggests neglect
- Replace the cam phaser, or the timing chain and tensioner, if worn — the expensive end
A guide, not a diagnosis. This page describes what P0011 generally means across OBD-II cars. What's actually wrong with your car depends on its live data and its history — and any repair decision deserves a proper diagnosis, whether that's you with a scanner or a professional with a lift.