A 2024 Alfa Romeo Tonale 1.5T Hybrid rolled into an Italian workshop with a P0016 code, leaving the technician staring at a vague crankshaft-to-camshaft correlation error. The technician noted "correlazione posizione albero motore/albero a camme" on the job card. On this specific 1.5T Hybrid engine (code 46347813), a P0016 is not just a simple sensor failure. The precision of the physical timing is critical for combustion management and the MHEV system integration. When this code hits, the bay stalls because the diagnostic path splits between mechanical stretch, hydraulic failure, and electrical interference.
Evaluating Mechanical Timing
Our Fault Code Intelligence ranked mechanical timing chain issues as the most probable cause at 90 percent severity. Chain stretch, worn tensioners, or degraded guide rails will cause a physical misalignment between the crankshaft and the camshaft. This pushes the signals from the crankshaft position sensor (CKP) and camshaft position sensor (CMP) outside the tight correlation window specified by the OEM. The platform advised starting with a visual verification of the timing marks and a direct inspection of the timing chain tensioner.
The VVT and Oil Control Variable
If the physical timing marks align, the next likely culprit sits in the hydraulic system. We ranked a VVT, MultiAir, or oil control malfunction at 85 percent probability. On this Alfa Romeo engine, the variable valve timing for the intake is entirely managed by engine oil pressure. Insufficient oil levels, incorrect viscosity, a clogged filter, or a stuck oil control valve (OCV) solenoid will prevent the VVT actuator from adjusting the intake camshaft correctly.
The OEM specifically highlights the system's extreme sensitivity to oil quality. An incorrect oil filter alone can restrict the VVT actuator's capacity, causing a rapid misalignment that triggers the P0016. Check the oil level and condition, test the VVT/OCV solenoid directly, and measure the actual engine oil pressure before tearing into the top end of the engine.
Electrical Interference in MHEV Systems
Electrical faults followed closely in our analysis. We ranked a faulty CKP sensor at 80 percent and the intake CMP sensor at 75 percent probability. What makes this interesting on the Tonale is the 48V MHEV architecture. Damaged wiring, corroded connectors, or compromised shielding near those high-voltage 48V cables can induce electromagnetic interference. This degrades the sensor signals sent to the engine control module.
Furthermore, ferrous debris on the sensor tip can distort the reading. The OEM notes electromagnetic interference and ferrous debris contamination as known problems for these sensors. Because the correlation is monitored specifically by the intake CMP sensor, capturing both signals simultaneously is vital. The required tests involve visual inspections of the sensors and harnesses, checking resistance and power feeds, and hooking up an oscilloscope to verify the integrity of both the CKP and intake CMP signals.
Keeping the Bay Moving
Tackling a P0016 on a modern hybrid requires a structured path based on data, not guesswork. By ranking the probabilities, you avoid ordering an expensive sensor when the vehicle actually needs an oil control valve or a timing chain inspection. Take a look at your own recent hybrid diagnostic jobs. Are you seeing similar oil-driven timing codes, and how is your shop handling the diagnostic routing?
Reference pages for the codes in this article
- P0016, what we measure for this code across real diagnostics