P0014 — exhaust cam timing over-advanced

Bank 1 exhaust cam · Variable valve timing · P0015 is the over-retarded twin

The short version

P0014 means the exhaust camshaft's actual timing ran ahead of what the computer commanded — over-advanced — or the timing system couldn't follow orders at all. It's the exhaust-side twin of P0011, and it's steered the same way: pressurised engine oil, routed through a solenoid, into a phaser on the end of the cam.

Because it's the same hydraulic mechanism, it fails for the same reasons in the same order — oil level, oil condition, and oil viscosity come before any part does. P0011's full oil-first walkthrough covers the dipstick check, the causes in order of cost, and how to read the result, and every word of it applies here unchanged.

What this page adds: which engines can even set this code, and why advancing the exhaust cam specifically feels different from advancing the intake one.

Reading codes and freeze frames is free in Fixiom — always, no credits and no subscription. So is a dipstick.

Why seeing this code means something

Not every engine with variable valve timing controls both camshafts independently. Plenty of common VVT systems only vary the intake cam — which is the only one that can set P0011 or P0012. Seeing P0014 confirms your engine has a second, independently-controlled solenoid and phaser on the exhaust side too — a genuinely different, more complex system than single-cam VVT, with twice the hydraulic hardware that can wear or clog.

That matters for the causes list below: everything named there is a second, physically separate solenoid and phaser from the intake-side ones, even though they share an oil supply. A P0011 and a P0014 stored together points at the shared oil; a P0014 alone points at the exhaust-side hardware specifically.

Why the exhaust cam behaves differently

Rotating the intake cam changes when the intake valve closes relative to the piston, which shifts how much of the intake charge actually gets trapped — that's the low-end torque and idle-stability lever P0011's page describes.

Rotating the exhaust cam changes something else: when the exhaust valve opens and closes, and therefore how much the intake and exhaust valves are open at the same time (overlap). Advancing the exhaust cam opens the exhaust valve earlier — cylinder pressure escapes before the power stroke has finished extracting all the work it can from it, a real if usually modest power cost — and closes it earlier too, which shrinks overlap. Less overlap means less hot exhaust gas is left behind in the cylinder for the next intake stroke than the computer planned for.

The practical difference: an intake-cam fault tends to read as soft, indifferent power, while an exhaust-cam fault more often reads as an idle that hunts or feels loose — the computer tunes idle fuel and spark around the overlap it commanded, and when the cam sits somewhere else (or wanders as a lazy phaser hunts), the amount of residual exhaust in the cylinder is not what that tune expects, and idle is where the mismatch shows first. Both can produce a check-engine light with no obvious feel at all — this is a tendency, not a rule, and the live data below is the way to actually tell.

The oil-first check

Identical procedure to P0011: engine off, cool, level ground. Check the dipstick for level (below the hatched zone or the low mark matters a lot here), condition (jet black or gritty argues against clean hydraulic control), and history (an overdue interval, or a recent change with the wrong viscosity, is a suspect on its own). The full version of this check goes into more detail on reading each of the three.

If the level was genuinely low or the oil clearly overdue: correct it, clear the code, and drive a few days before spending money on parts.

What live data shows

From the driver's seat, engine warm and idling:

• Watch idle speed and its steadiness. An idle that hunts, dips, or feels loose on a warm engine corroborates an overlap problem specifically — the exhaust-cam signature described above.
• Watch exhaust cam position where the vehicle reports commanded versus actual. Many dual-VVT engines expose this for both cams separately — Fixiom shows the signal only when your specific vehicle actually answers it. A persistent gap between commanded and actual, on the exhaust cam specifically, is this code drawn as a picture.
• Read the freeze frame. A code that set at idle leans toward the overlap-and-idle-quality story above; one that set under load leans toward a lazy solenoid or worn phaser regardless of which cam it's on.

Causes, in order of cost

• Oil: level, age, or grade. Shared with every VVT fault on the engine — cheapest, first, and genuinely common.
• The exhaust-side oil control solenoid sticking or clogged with varnish. A physically separate part from the intake-side solenoid, even on the same engine.
• The exhaust phaser itself worn, or its lock pin failing — often the source of a cold-start rattle, exactly as on the intake side.
• Timing chain stretched or its tensioner tired — the whole system's geometry drifts, and it usually announces itself with noise.
• Wiring or connector faults at the exhaust-side solenoid.

Is it safe to drive?

Generally drivable in the short term. As with P0011: don't sit on it if there's a cold-start rattle (mechanical wear happening audibly), and treat a stall at idle in traffic as a now problem rather than a diagnosis to schedule for later.

What a phone can't see

What it genuinely gives you: the code, the freeze frame, commanded-versus-actual exhaust cam data where the vehicle reports it, idle behaviour, and — with the dipstick — a real first pass at oil-versus-parts.

What it cannot do: measure actual oil pressure, inspect the exhaust-side solenoid's screen for debris, or see chain stretch and timing marks. Those are hands-on, exactly as with P0011.

Common questions

Related guides

• P0011 — Cam timing over-advanced — the code where the dipstick is the first diagnostic tool.
• P0300 — Random misfire — and the per-cylinder counters that show which one it really is.
• Check engine light on — The triage page — how urgent is it, and what to do in what order.