P1396 on 2007-2009 Jaguar XK (XK, XKR) — Variable Valve Timing Solenoid Malfunction — Bank B
1 vehicles · 1 makes · $600-$2,500 repair
How to diagnose and fix P1396: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Jaguar XK · 2007–2009
On the 4.2 AJ-V8, worn VVT solenoids and cam phasers are a leading cause of a brief rattle on cold start-up. The locking pin in the intake-cam actuator sticks or breaks, allowing excessive cam movement (roughly 20 degrees each way) until oil pressure builds. It grows more common at higher mileage and can be aggravated by degraded or wrong-viscosity oil. While often just noise, a failing phaser/solenoid can eventually set cam timing correlation faults.
Common Symptoms
- Rattle/clatter for 1-3 seconds on cold start
- Top-of-engine noise that fades as oil pressure builds
- Rough idle when cold
- Occasional cam-timing fault codes
How to Fix
Verify with a scan and by checking cam movement with covers off; test solenoids for proper click/actuation. Replace the affected VVT solenoid(s) and cam phaser hardware, and use fresh oil of the correct grade — some owners find a switch to a quality 5W-40/synthetic reduces the rattle. Full VVT-related repairs can run well over a thousand USD due to access.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- OEM-quality AJ810570 VVT oil-control solenoidOEMAJ810570 / AJ84144 / AJ86823 / C2S4946
Electrically or hydraulically confirmed failed VVT oil-control solenoid on a 2007-2009 XK/XKR 4.2L Fitment/availability: AJ810570 is explicitly listed for X150 XK/XKR 3.5L/4.2L 2006-2009 and supersedes AJ84144/AJ86823/C2S4946. Verify VIN…
- AJ82856 VVT-solenoid sealing ringOEMAJ82856
Confirm quantity and VIN; it seals the solenoid and does not repair an electrical, oil-pressure or phaser fault by itself.
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Sources for this issue (2)
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P1396 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 P1396 mean?
P1396 stands for "Variable Valve Timing Solenoid Malfunction — Bank B." Jaguar manufacturer-specific code for the variable valve timing system on the AJ-series V8. The ECM commands the VVT solenoid on the 'B' bank and monitors the resulting camshaft position; P1396 sets when the commanded valve-timing change is not achieved, indicating a fault in the VVT solenoid, its circuit, or the mechanical phasing it controls. Jaguar publishes a dedicated diagnostic procedure ('Variable Valve Timing Solenoid - DTC P1396 Diagnosis') that checks the VVT solenoid, the VVT actuator and the camshaft position sensor reluctor. The companion code P1384 covers the 'A' bank.
What are the most common causes of P1396?
The most common causes of P1396 are: Failed or electrically open/shorted VVT solenoid on the B bank, Dirty or degraded engine oil, or sludge partially blocking the VVT oil galleries and solenoid screen, Low oil level / low oil pressure, Worn VVT actuator (cam phaser) or damaged camshaft position sensor reluctor, Stretched timing chain or tensioner wear altering cam phasing, Wiring, connector or ECM driver fault on the solenoid circuit. The specific cause varies by vehicle.
How much does it cost to fix P1396?
Repair costs for P1396 range from $600 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P1396?
Au7o has documented P1396 across 1 vehicle models from 1 manufacturers: Jaguar.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.