What does P0016 mean?
Crankshaft Position — Camshaft Position Correlation (Bank 1, Sensor A)
Direct Answer
P0016 means the ECM detected that the crankshaft and Bank 1 intake camshaft positions are out of sync. These must maintain a precise relationship for proper ignition timing and valve timing. If they are offset, combustion efficiency and reliability are severely impacted.
Common Symptoms
- ✓Check engine light on
- ✓Hard starting or no start
- ✓Rough idle, stalling
- ✓Rattling from timing area on startup
- ✓Significant loss of power
Common Causes
- 01Stretched or worn timing chain (most common on high-mileage engines)
- 02Worn timing chain tensioner or guides
- 03Camshaft phaser failure (stuck or worn)
- 04Low oil pressure to timing components
- 05Incorrect engine oil viscosity
- 06Faulty crankshaft or camshaft position sensor
How to Fix P0016
Check oil level and quality
Fresh, correct-viscosity oil is essential for timing component operation. Change the oil first.
Listen for timing chain rattle
A rattling noise on cold startup that diminishes as the engine warms is a strong indicator of a worn timing chain or tensioner.
Inspect the timing chain system
A technician will remove the timing cover to inspect chain stretch, tensioner condition, and guide wear. This is required for accurate diagnosis.
Replace worn timing components
Stretched chains, worn tensioners, and failed phasers all need replacement. This is a major repair but necessary to prevent catastrophic engine damage.
Frequently Asked Questions
Can P0016 cause my engine not to start?
Yes. Severe cam-crank timing misalignment can prevent the engine from starting, and in extreme cases can cause valve-to-piston contact on interference engines, destroying the engine.
Estimated Repair Cost
$30–$3000
Oil change: $30–$80. Timing chain service: $800–$2,000+. Full engine timing overhaul: $1,500–$3,000+.
Safe to Drive?
No — avoid driving
Do not drive. Incorrect cam-crank timing can cause engine damage and the vehicle may not run well enough to be safe.
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