Crankshaft/Camshaft Position Correlation Bank 1 Sensor A
The Powertrain Control Module (PCM) detected that the timing between the crankshaft and the Bank 1 intake camshaft (Sensor A) is out of sync. This typically means the signals from the crankshaft position sensor and camshaft position sensor do not align with the expected factory timing parameters.
Driving with a timing correlation issue can lead to severe internal engine damage if the timing chain or belt fails completely. It should be diagnosed and repaired immediately to prevent catastrophic piston-to-valve contact.
Common symptoms
- Illuminated Check Engine Light
- Rough idle or engine stalling
- Hard starting or extended cranking time
- Reduced engine power and poor acceleration
- Decreased fuel economy
Likely causes
- Stretched timing chain or worn timing belt
- Faulty or stuck variable valve timing (VVT) solenoid/actuator
- Worn timing chain guides or tensioner
- Defective camshaft position sensor or crankshaft position sensor
- Damaged or corroded wiring in the sensor circuits
- Slipped reluctor ring on the crankshaft or camshaft
What to check before replacing parts
Scan for additional codes and check oil level/condition.
Look for: Low or dirty engine oil can cause VVT actuators to stick, leading to correlation codes. Other VVT or sensor codes can help isolate the issue.
Inspect the wiring and connectors for the camshaft and crankshaft position sensors.
Look for: Look for frayed wires, oil intrusion, or loose connections that could distort the sensor signals sent to the PCM.
Test the Variable Valve Timing (VVT) solenoid/actuator operation.
Look for: Command the VVT solenoid using a bi-directional scan tool; if the engine idle does not change or stall, the solenoid may be stuck or faulty.
View the cam and crank sensor signals using a dual-channel oscilloscope.
Look for: Compare the waveform patterns to a known good factory reference chart to definitively see if the physical timing is out of sync.
Perform a physical inspection of the timing chain/belt and alignment marks.
Look for: Remove the timing cover and check if the factory timing marks align perfectly at Top Dead Center (TDC) and inspect for excessive chain slack or tensioner failure.
This page explains the generic P0016 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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