P00B7 on Jaguar: How to Diagnose & Fix
Engine Coolant Flow Low/Performance
1 Jaguar model · 1 documented issue · 1 critical · $550-$1,500 repair
P00B7 on Jaguar by model: symptoms, diagnosis and fix
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 The current superseded OEM part number is AJ813909; Jaguar also began fitting the improved pump from the factory on later cars (XK from approx.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…
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Sources for this issue (2)
P00B7 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 P00B7 mean on a Jaguar?
P00B7 stands for "Engine Coolant Flow Low/Performance." P00B7 means the powertrain control module has determined that coolant flow through the engine's cooling system is too low or not performing as expected. The computer compares signals — typically from the engine coolant temperature sensor and a second temperature sensor (such as the radiator outlet) — and flags this code when the readings indicate coolant isn't circulating properly to manage engine temperature. Restricted flow can let the engine run hotter than designed, risking overheating. The cause is usually a thermostat, water pump, low coolant, or a sensor reading problem. On Jaguar it is documented across 1 model: XK.
What are the most common causes of P00B7?
The most common causes of P00B7 are: Stuck or faulty thermostat, Low coolant level or air pockets in the system, Failing water pump (mechanical or electric), Faulty engine coolant temperature or radiator temperature sensor, Clogged radiator, hoses, or coolant passages with sediment/debris, Coolant leak reducing system volume, Wiring/connector faults at the temperature sensors or PCM control issue. The specific cause varies by vehicle.
How much does it cost to fix P00B7 on a Jaguar?
Published repair estimates on Jaguar range from $550 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 P00B7 on a different make?
View P00B7 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.