OBD-II Code P0016 — What It Means & How to Fix It

What Does This Error Mean?

P0016 means the crankshaft and camshaft position sensors are not in sync. Your engine's computer compares signals from both sensors to keep timing precise. When these two signals don't match up, the engine can't time fuel injection and ignition correctly. You may notice rough running, hard starting, stalling, or poor fuel economy. This code should be addressed promptly to prevent further engine damage.

Affected Models

All vehicles 1996+
Common in Chevrolet Equinox
Common in Ford Explorer
Common in Nissan Altima
Common in Hyundai Tucson

Common Causes

Stretched or worn timing chain that has skipped a tooth on the sprocket
Failed or sticking camshaft phaser unable to hold correct position
Dirty engine oil restricting flow to the variable valve timing system
Faulty crankshaft or camshaft position sensor giving incorrect readings
Damaged reluctor ring on the crankshaft or camshaft causing bad signal

How to Fix It

Check your engine oil level and condition first. Low or dirty oil is a very common cause of timing correlation problems because the VVT system depends on clean oil flow.

If your oil is overdue for a change, do that first. It's the cheapest possible fix for this code.
Clear the code with an OBD-II scanner after the oil change. Drive normally for several days and see if the code returns. Many P0016 codes disappear after fresh oil restores proper flow.

You can borrow a free scanner from most auto parts stores to clear and monitor codes.
If the code returns, inspect the camshaft and crankshaft position sensors. Check their wiring connectors for corrosion, loose pins, or damaged insulation.

A bad sensor can mimic timing problems even when the actual timing is fine.
Replace the camshaft position sensor if it appears suspect. These sensors are relatively affordable and usually accessible without major disassembly.

Camshaft position sensors typically cost $15-$60 and can often be swapped in under 30 minutes.
Listen for a rattling or slapping noise at cold startup, especially in the first few seconds. This is a telltale sign of a stretched timing chain that needs professional replacement.

A timing chain rattle that goes away after a few seconds means the chain tensioner is worn and losing pressure overnight.

When to Call a Professional

If an oil change and sensor replacement don't fix the code, see a mechanic. A jumped timing chain requires engine disassembly and precise reassembly. Misaligned timing can cause serious internal engine damage if ignored. Expect $100-$200 for diagnosis. Timing chain and phaser replacement typically costs $1,000-$3,000.

Frequently Asked Questions

What is a crankshaft/camshaft correlation problem?

Your engine has two key rotating parts — the crankshaft and camshaft. They must spin in perfect sync with each other. The computer monitors both with separate sensors. P0016 means these two parts are slightly out of sync. It's like two clocks that should match but are a few seconds apart.

Can I drive with P0016?

You can drive short distances, but be cautious. If the timing is significantly off, the engine may stall unexpectedly. Driving with misaligned timing can damage pistons and valves in severe cases. Get this diagnosed within a few days to be safe.

Does P0016 always mean the timing chain is bad?

No, not always. Dirty oil and faulty sensors trigger this code more often than you'd expect. Start with an oil change and sensor inspection before assuming the worst. But if you hear a rattling noise at startup, the timing chain is likely the culprit.