A code that signals the engine's crankshaft and camshaft are out of sync. On Jaguar petrol and diesel engines, this often points to a stretched timing chain, a faulty variable valve timing (VVT) solenoid, or a worn tensioner. Ignoring it risks catastrophic engine damage.
P0016 means the engine control unit (ECU) has detected that the crankshaft and camshaft positions are no longer synchronised within the acceptable tolerance. On most Jaguar engines - from the Ingenium AJ200D to the AJ133 V8 - this is typically caused by timing chain stretch, a failed tensioner, or a variable valve timing (VVT) solenoid malfunction. The fix can range from a £200 solenoid replacement to a £2,500+ timing chain overhaul.
Do not ignore P0016. If the timing jumps, pistons and valves can collide, writing off the engine. Have it diagnosed immediately.
In a modern Jaguar engine, the crankshaft position sensor and camshaft position sensor work together to tell the ECU exactly where each piston is in its stroke and which valves are open. The ECU uses this data to control fuel injection, ignition timing, and variable valve timing. P0016 is triggered when the ECU detects that the camshaft position (relative to the crankshaft) has drifted beyond the allowed range - typically more than a few degrees. This can happen because the timing chain has stretched, a tensioner has lost pressure, or a VVT actuator has stuck. The code is often engine‑specific: on V6 and V8 engines, you may see P0016 for bank 1 and P0017 for bank 2. On four‑cylinder Ingenium diesels and 204PT petrols, a single P0016 typically indicates the intake camshaft on the single bank. The underlying cause is almost always mechanical, not electrical - which makes this a code that demands immediate attention.
If you hear a rattle on startup and see the engine light, stop driving and arrange a diagnostic check immediately.
Based on real diagnostic patterns from Jaguar specialists. The order reflects both likelihood and typical repair cost.
| Cause | Likelihood | Typical Cost (Fitted) | Notes |
|---|---|---|---|
| Faulty VVT solenoid (oil control valve) | High | £200–£400 | Often sticks due to sludge; clean or replace; cheap and quick |
| Worn timing chain tensioner | High | £1,200–£2,500 | Loss of oil pressure causes slack; common on Ingenium and AJ133 pre‑2013 |
| Stretched timing chain | Medium‑High | £1,500–£3,000 | Chain elongates over time; often requires full chain kit replacement |
| Low engine oil level or pressure | Medium | £50–£200 (top‑up) | VVT systems rely on oil pressure; low oil can trigger the code |
| Failed camshaft position sensor | Low | £150–£300 | Rare; the sensor may report incorrect position, mimicking a mechanical fault |
| Timing chain guide or sprocket wear | Low | £1,800–£3,500 | Plastic guides break; metal debris can damage other components |
Cost figures [PATTERN DATA] - indicative independent‑specialist pricing, not drawn from our engine replacement dataset.
A competent Jaguar specialist will follow this order to avoid misdiagnosing an expensive timing chain job.
Low oil can cause VVT solenoids to malfunction. Top up and clear codes; if the code returns, proceed.
Remove and test the solenoid for sticking. Clean or replace; this resolves a significant number of cases.
Using diagnostic software, compare the camshaft position to the crankshaft. A deviation of more than 5° indicates mechanical wear.
If the offset is excessive, the tensioner may have lost pressure; often requires chain cover removal for inspection.
If wear is confirmed, the timing chain, guides, and tensioner should be replaced as a kit. This is the most involved repair.
Our diagnostic wizard walks the same order, or use the registration lookup to confirm your engine.
No - or only to get it directly to a garage. P0016 indicates a potential mechanical mismatch between the crankshaft and camshaft. If the timing chain has stretched or a tensioner has failed, continuing to drive risks the chain jumping teeth, which can cause pistons to strike valves - a catastrophic failure that often requires a full engine replacement. Even if the cause is a faulty VVT solenoid, driving with the code can cause the ECU to run in a reduced‑power mode, increasing fuel consumption and potentially damaging the catalytic converter. The only safe action is to have the car recovered to a specialist for diagnosis. If you absolutely must drive, keep it to a short, low‑speed journey of no more than a few miles, and listen for any unusual rattles.
It means the ECU has detected that the crankshaft and camshaft are out of sync by more than a few degrees. This is often due to a stretched timing chain, a failed tensioner, or a faulty VVT solenoid.
No - or only to get it directly to a garage. Driving with this code risks the timing chain jumping, which can cause pistons to strike valves and destroy the engine. Have the car recovered.
Yes, it's considered a serious fault. While it may be caused by a simple VVT solenoid, it could also indicate imminent timing chain failure. Immediate diagnosis is essential.
The cost ranges from about £200 for a VVT solenoid replacement to £2,500–£3,500 for a full timing chain kit replacement. Diagnostic time is typically 1–2 hours.
Only temporarily. The code will return if the underlying mechanical issue persists, and clearing it destroys freeze‑frame data that helps diagnosis.
Cheapest‑First AlwaysWe rank causes by diagnostic order and cost, never the other way around.
Independent & HonestWe're not a garage. We're an independent resource that routes you to vetted specialists.
15+ Vetted Jaguar SpecialistsDiagnostics and repairs carried out by people who know these engines intimately.
Data‑Backed ContentOur advice is built on real enquiry data from 9,000+ UK owners.
Compare diagnostic and repair quotes from our vetted specialist network.
COMPARE QUOTES NOW → RUN THE DIAGNOSTIC WIZARD