P0018 on Jaguar: How to Diagnose & Fix
Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A
3 Jaguar models · 3 documented issues · 3 critical · $3,500-$9,000 repair
P0018 on Jaguar by model: symptoms, diagnosis and fix
The Jaguar AJ-V8 engines in the XF suffer from timing chain tensioner and tensioner-lever wear, causing chain slack on cold starts. On the 5.0L, wear on the timing chain tensioner lever reduces chain tension and allows the chain to rattle, and prolonged neglect leads to stretched chains and jumped timing, risking catastrophic valve-to-piston contact.
Common Symptoms
- Rattling noise on cold start lasting several seconds
- Check engine light with cam timing codes
- Rough idle on cold start
- Progressive worsening of rattle over months
How to Fix
Replace the timing chain tensioners and tensioner levers. On the 5.0L V8, JLR's bulletin for the same engine in Land Rover models specifies two tensioners and two tensioner levers, with roughly 8-9 hours of labor; inspect the chains and replace them if stretched. Use updated JLR tensioner part numbers. Do not delay once cold-start rattle is observed.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- HTK200 complete timing-chain kit for the 2009 4.2L XF branchOEMHTK200
Confirmed chain, guide or tensioner failure on a 2009 XF 4.2L naturally aspirated or supercharged engine Fitment/availability: HTK200 is the later AJ-V8 chain/guide/tensioner kit and its application family includes the 4.2L components us…
- GTCK8003 complete 8 mm AJ133 timing-chain kitOEMGTCK8003
Confirmed timing-drive wear on a 2010-2015 XF 5.0L physically/VIN confirmed to use the 8 mm INA chain system Fitment/availability: GTCK8003 lists XF 5.0L 2009-2015 and contains 8 mm chains, auxiliary chain, guides, tensioners and crank s…
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Owner tips & cautions
- WarningDo not ignore cold-start rattle. Once the chain jumps, expect $10,000+ in engine damage or a full engine replacement. Budget $5,000-$8,000 for preventive replacement at a specialist.
Sources for this issue (1)
The AJ-V8 engine in the XK shares the same timing chain tensioner weakness found across the Jaguar V8 range. The tensioners and their plastic-faced tensioner blades wear, letting chain tension drop so the timing chains rattle on startup and the problem worsens until timing is compromised.
Common Symptoms
- Rattling on cold start for several seconds
- Check engine light with cam timing codes
- Rough idle on startup
- Progressively louder and longer rattle over months
How to Fix
Replace all timing chain tensioners, chains, and guides with updated JLR parts. On the XK, access is achieved by removing the front cover with the engine in-frame. Budget 25+ hours labor. Use updated part numbers for improved tensioner oil retention.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- HTK200 complete later AJ-V8 timing-chain kit for the 4.2L XK/XKR branchOEMHTK200
Confirmed timing-chain, guide or tensioner wear on a 2007-2009 XK/XKR 4.2L Fitment/availability: HTK200 is the later AJ-V8 chain/guide/tensioner family and lists XK/XKR applications. Confirm 4.2L engine, VIN and complete kit contents wit…
- GTCK8003 complete 8 mm AJ133 timing-chain kitOEMGTCK8003 / C2Z20573 / C2Z22078
Confirmed timing-drive wear on a 2009-2014 XK 5.0L physically or by VIN verified to use the 8 mm INA chain system Fitment/availability: GTCK8003 explicitly lists XK 5.0L 2009-2014, naturally aspirated and supercharged AJ133, and contains…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- WarningAny cold-start rattle on the XK V8 should be treated as urgent. These engines are expensive to rebuild and the damage from jumped timing is catastrophic.
Sources for this issue (1)
The 5.0-litre AJ133 V8 fitted to the X351 has a widely documented timing drive weakness. The hydraulic tensioner's hardened steel plunger bears against a guide rail with a soft aluminium core and a plastic wear face. The plunger cuts a groove into that face; the ratchet that is supposed to hold tension with the engine off then cannot, and the chain slaps on start-up before oil pressure builds. There are no fault codes at the rattle stage, which is exactly why it gets ignored. Left alone, the chain can jump a tooth — giving a restricted-performance warning and misfire codes — or break, which on this interference engine destroys it. Jaguar Land Rover revised the timing components progressively, with the setup substantially reworked by around 2015-2016, so late facelift cars are lower risk than early ones.
Common Symptoms
- Rattle from the front of the engine for a few seconds on cold start-up
- Rattle that disappears once oil pressure comes up
- 'Restricted Performance' warning message
- Rough running or misfire after the chain jumps a tooth
- Check engine light with misfire or camshaft correlation codes
- Complete engine failure without warning in advanced cases
How to Fix
Treat cold-start rattle as urgent and replace chains, tensioners and guides as a complete drive service; verify the exact engine and production revision before ordering.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- AJ133 timing-chain kit for Jaguar XJ/XJR X351$124
2010-present listing for Jaguar XJ/XJR X351 with AJ133; use only for the issue's 2010-2015 5.0L AJ133 branch after VIN and engine verification.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (4)
P0018 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0018 mean on a Jaguar?
P0018 stands for "Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A." This code means the computer detected that the crankshaft and the Bank 2 'A' (typically intake) camshaft are out of their expected timing relationship. The computer compares the crankshaft and camshaft position sensor signals; they should stay in a fixed correlation as the engine turns. When the Bank 2 camshaft is too far off from the crankshaft, P0018 sets, indicating the valve timing on that bank is misaligned. This can cause rough running, reduced power, hard starting, or a no-start, and in some cases signals timing chain or phaser trouble that warrants prompt attention. On Jaguar it is documented across 3 models: XF, XK, XJ.
What are the most common causes of P0018?
The most common causes of P0018 are: Stretched, worn, or jumped timing chain (Bank 2), Worn or broken timing chain guides/tensioner, Stuck variable valve timing solenoid or phaser, Low or dirty engine oil affecting the phaser, Faulty crankshaft or camshaft position sensor, Damaged reluctor/tone ring, Incorrect timing from prior service, Wiring or connector fault at a cam/crank sensor. The specific cause varies by vehicle.
How much does it cost to fix P0018 on a Jaguar?
Published repair estimates on Jaguar range from $3,500 to $9,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.