Crankshaft / Camshaft Position Correlation (Bank 1 Sensor A)

The PCM watches where the cam is when the crank is at a specific position. They have a fixed relationship — TDC #1 compression should always put the cam in a known spot. P0016 sets when that relationship is off by more than the allowed window. Most common cause on high-mileage engines is a stretched timing chain (a chain elongation problem on many 2.0L/2.4L GDI engines). Can also be a stuck VVT phaser or dirty oil holding the phaser in the wrong position.

Cam position at the crank-reference event is outside the allowed angle window — typically more than 5–10° off from expected.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 1Check oil level and condition FIRST — bad oil destroys VVT systems.
2. 2Read VVT cam position commanded vs actual. If actual won't return to zero with engine off / commanded zero — phaser is stuck.
3. 3Pull and clean the VVT solenoid screen. Retest.
4. 4If solenoid is good and phaser responds, do a static timing check — pull cover, verify timing marks at TDC #1.
5. 5Marks off by a tooth or more = chain stretched / jumped. Replace chain, guides, tensioner, and phasers together.

• Stretched timing chain (very common on GDI engines past 80k mi)
• Worn chain guide / tensioner
• Stuck VVT phaser (oil-related)
• Dirty oil clogging VVT solenoid
• Cam or crank sensor reading bad signal
• Jumped timing belt / chain a full tooth

$200 (solenoid + oil change) to $2,500 (full timing job).