P0217 on Jaguar: How to Diagnose & Fix
Engine Overtemperature Condition
2 Jaguar models · 3 documented issues · 3 critical · $400-$1,500 repair
P0217 on Jaguar by model: symptoms, diagnosis and fix
Owners of 4.2 V8 XJs report the plastic thermostat housing cracking and leaking coolant, with the low-coolant warning or overheating as the first sign. Owners also name the expansion (overflow) tank and its small pipe connections as a leak point; Jaguar service message SSM51717 confirms the expansion tank stub pipe can split on XJ (X350) up to the end of the 2009 model year. Applies to: 2004-2009 XJ (X350 generation) with the 4.2 V8; owner reports include a 2004 Vanden Plas, a 2005 XJ8L and a 2006 Super V8. The expansion tank stub pipe message (SSM51717) covers all X350 XJs up to the end of 2009 MY. Summarized from the owner reports linked here; not a manufacturer finding. Your vehicle's equipment and history may differ; a technician must confirm the cause. Mileage when it happened, as stated in the linked owner reports: 20,000 miles on a 2004 and 108,000 miles on a 2005.
How to Fix
If a low-coolant warning appears or temperature climbs, have a qualified technician pressure-test the cold cooling system and inspect the thermostat housing, expansion tank and hoses. Owners report replacing a diagnosed cracked thermostat housing with its gaskets, or a diagnosed leaking expansion tank. The new tank pictured is ONLY the latter branch, not a complete cooling-system repair kit. SSM51717 historically reported an improved stub-pipe design and assured replacement stock from 2010; current VIN-specific parts still need confirmation. One owner traced continued loss and overheating to a replacement water-pump impeller; that individual outcome is not a reason to replace every pump.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (4)
- Jag-lovers: Unfortunate X350 coolant leakforum
- Jaguar Forums (XJ X350/X358): Coolant leak and overheating (Wayback copy)forum
- Jaguar Forums (XJ X350/X358): What issues plague the 2005-2008 Super V8 or XJR? (Wayback copy)forum
- Jaguar SSM51717, Coolant expansion tank stub pipe leaking up to 2009 MY (XJ X350, XK X150, XF X250)manufacturer
The AJ-V8 routes coolant through molded plastic pipes in the engine 'valley'/V (the crossover pipe that plugs into the block, and on 4.2/supercharged cars the valley pipes beneath the supercharger). With age the plastic embrittles and the molded seam splits, or the stubs shear at the block, causing sudden major coolant loss. Because the failure is buried under the intake/supercharger, leaks are hard to spot and can strand the car. For the 5.0L AJ133, Jaguar service message SSM72002 (XK/X150, XF, XJ) describes a coolant leak from the seam of a coolant pipe, caused by a supplier process issue later fixed with improved seam welding.
Common Symptoms
- Rapid/major coolant loss with no obvious external leak
- Coolant pooling under the car after driving
- Low coolant warning and overheating
- Steam or coolant smell from engine bay
How to Fix
Pressure-test the cooling system to locate the failed pipe, then replace the crossover/valley pipe(s) — many owners upgrade the 4.2 valley pipes to silicone. Given shared age, it is best practice to renew all accessible plastic cooling pipes and O-rings at once. On supercharged cars the blower must come off, driving labor up.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Jaguar AJ811064 block-to-EGR coolant hose for 4.2L supercharged XK/XKROEMAJ811064
Confirmed leak or deterioration at the block-to-EGR hose under the supercharger on a 2007-2009 XKR 4.2L supercharged engine Fitment/availability: AJ811064 is explicitly cataloged for the 2008 XKR 4.2L supercharged block-to-EGR position. …
- Genuine Jaguar AJ89664 water-outlet pipe for 5.0L naturally aspirated XKOEMAJ89664
Confirmed outlet-pipe seam, stub or seal leak on a 2010-2015 XK 5.0L without supercharger Fitment/availability: AJ89664 is explicitly described for the XK 5.0L without supercharger. Confirm VIN and pipe label; it is not for XKR/XKR-S sup…
- Genuine Jaguar AJ814311 updated metal coolant-pipe componentOEMAJ814311
One required half of the current AJ813865 metal supersession after VIN and failed-pipe confirmation Fitment/availability: AJ814311 is listed for XK/XKR and is an updated metal design. FCP states AJ813865 must be replaced by AJ814311 and …
- Genuine Jaguar AJ814312 companion metal coolant-pipe componentOEMAJ814312
Confirm the XK VIN/current catalog and all required seals before ordering; AJ814312 alone is not a complete repa
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 (2)
The mechanical water pump on the 5.0L AJ133 V8 is a recognized weak point. Coolant migrates past the shaft seal into the bearing housing, corroding the bearing so the impeller shaft is no longer properly supported. This accelerates wear on the flat-face mechanical seal and lets coolant escape at the pump. Failures are common and can occur early — some owners report leaks in under 20,000 miles. Left unaddressed it leads to progressive coolant loss and overheating risk on an aluminum V8.
Common Symptoms
- Low coolant level warning message
- Coolant traces around the water pump pulley/weep hole
- Sweet coolant smell after driving
- Coolant drips at front of engine
- Rising temperature / overheating in traffic
How to Fix
Replace the water pump with the latest revised design that adds a more robust bearing and additional sealing. The current superseded OEM part number is AJ813909; Jaguar also began fitting the improved pump from the factory on later cars (XK from approx. VIN B46456). Refresh coolant and inspect the crossover/valley plastic pipe at the same time since it is the other common 5.0 cooling weak point. Typical independent-shop cost is a few hundred to well over a thousand USD depending on labor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Jaguar AJ813909 revised water-pump assembly with gasketOEMAJ813909
Confirmed mechanical water-pump leakage or bearing/impeller failure on a 2010-2015 XK 5.0L naturally aspirated or supercharged engine Fitment/availability: AJ813909 is the current supersession for the applicable AJ133 pump family and inc…
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 (2)
P0217 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 P0217 mean on a Jaguar?
P0217 stands for "Engine Overtemperature Condition." This code sets when the engine control module detects that the engine has exceeded its safe operating temperature, meaning the engine is overheating based on the coolant temperature sensor reading. Because excessive heat can warp the cylinder head, blow the head gasket, or seize the engine, the computer flags this condition and may reduce power to protect the engine. It generally indicates a real cooling system problem rather than just a sensor glitch, though a faulty sensor can occasionally cause a false reading. An overheating engine should be stopped as soon as it is safe to avoid serious damage. On Jaguar it is documented across 2 models: XJ, XK.
What are the most common causes of P0217?
The most common causes of P0217 are: Low coolant level or a leak in the cooling system, Stuck-closed thermostat, Failed water pump, Faulty radiator cooling fan or fan circuit, Clogged or blocked radiator, Faulty coolant temperature sensor giving a false high reading, Head gasket failure or combustion gases in the coolant, Air pocket in the cooling system after service. The specific cause varies by vehicle.
How much does it cost to fix P0217 on a Jaguar?
Published repair estimates on Jaguar range from $400 to $1,500 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.
Looking for P0217 on a different make?
View P0217 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.