The Discovery Sport P300e is Land Rover's compact premium SUV with plug-in hybrid capability, combining a 1.5-litre three-cylinder Ingenium turbo petrol engine with an electric rear axle drive (ERAD) for 309 hp and claimed 55 km electric range. It sits below the Range Rover Evoque P300e on the brand ladder but shares the same PHEV powertrain. The hybrid system adds significant complexity over the conventional diesel and petrol variants, introducing several unique failure points.· more· less
Full AWD capability in EV modeStrong combined performance (309 hp)
ERAD electric axle failures costlyHybrid-specific faults are common
Buy if: You want a premium compact SUV with genuine off-road capability and electric driving, and can budget for potentially expensive hybrid-system repairs.
Avoid if: You primarily do short trips where the petrol engine rarely reaches operating temperature, or you cannot afford surprise repair bills exceeding €5,000.
Oil leakage in the ERAD unit causes complete electric drive failure, requiring full replacement · more· less
The ERAD is the electric motor integrated into the rear axle that provides AWD capability and EV-only driving. Documented cases show oil leakage causing complete failure, with replacement costs of approximately £8,300 (around €10,000) at a Land Rover dealer. One owner experienced two ERAD failures in 2.5 years, suggesting the replacement unit may be susceptible to the same failure mode. The ERAD is sensitive to water ingress and sensor faults. When it fails, the car loses electric drive entirely and runs as front-wheel drive only on the petrol engine. Out of warranty, this is one of the most expensive single repairs on any PHEV in this segment.
HV coolant heater failure (EV mode unavailable)
€1,000 - 2,5002 of 7
Faulty high-voltage coolant heater triggers persistent 'EV temporarily not available' message · more· less
This is one of the most widely reported P300e issues. The high-voltage coolant heater, which provides cabin heating in EV mode without running the petrol engine, fails and triggers the 'EV temporarily not available' warning. A 12-page forum thread on discosportforums documents dozens of affected owners. Turning off all climate control can temporarily restore EV mode, confirming the heater as the cause. Replacement typically resolves the issue, but some owners report needing the heater replaced multiple times. The part and labor cost around £800-2,000 (approximately €1,000-2,500) at a dealer.
DC-DC converter failure (12V system not charging)
€1,500 - 3,0003 of 7
Internal microchip fault stops 12V system charging, causing warning lights and potential power loss · more· less
JLR issued a recall affecting over 170,000 vehicles including the Discovery Sport P300e for DC-DC converter failure. The converter steps voltage down from the high-voltage system to charge the 12V battery that powers electronics, lights, and control modules. An internal fault in the boost control microchip causes the converter to stop working, triggering multiple dashboard warnings. If ignored, the vehicle loses exterior lighting and eventually drive power. As of mid-2025, JLR acknowledged the issue but the corrective repair action had not been finalized for all affected vehicles, which is unusual for a safety recall.
Charging system faults
€500 - 2,0004 of 7
Onboard charger or charging port fails, preventing the battery from accepting charge · more· less
Multiple owners report the P300e failing to charge, with symptoms including the charger starting then cutting off after seconds, getting stuck on 'initializing', or not responding to scheduled charging. Root causes range from software glitches (fixable via dealer update) to hardware failures in the onboard charger module or charging port actuator. Some owners report that new batteries and BMS replacements did not resolve the issue, suggesting deeper electrical faults. A PHEV that cannot charge its battery operates as an inefficient, heavy petrol car, negating the ownership benefit.
High-voltage battery degradation
€2,000 - 8,0005 of 7
Battery capacity drops noticeably, reducing electric range by 30% or more from new · more· less
Some owners have reported their P300e losing roughly 30% of electric range compared to when new. The 15 kWh battery is relatively small, so even moderate degradation significantly impacts usable EV range. Land Rover offers an 8-year / 160,000 km battery warranty with a 70% state-of-charge guarantee. Module replacement is possible but expensive if outside warranty. Frequent short trips where the battery is rarely fully cycled can accelerate degradation. If degradation stays above the 70% threshold, Land Rover may decline warranty claims even when range feels inadequate.
Oil dilution from PHEV driving patterns
€300 - 8006 of 7
Frequent short engine runs dilute oil with unburned fuel, increasing engine wear risk · more· less
When the P300e runs predominantly in EV mode, the petrol engine starts intermittently but may not reach full operating temperature before switching off again. This allows unburned fuel to wash past the piston rings into the engine oil, diluting it. Diluted oil loses its protective properties, accelerating wear on bearings, cylinder walls, and the timing chain. Owners are advised to periodically run the engine until fully warm and to change oil more frequently than the official interval if driving mostly short electric trips. The cost reflects more frequent oil changes at shorter intervals than the standard schedule.
Pivi Pro infotainment freezing and crashes
€0 - 5007 of 7
Touchscreen freezes, goes black, or loses navigation during driving · more· less
The Pivi Pro infotainment system is shared across the JLR range and is known for occasional freezing, black screens, and software crashes. Some owners report it happening after overnight charging. Memory management issues can cause the system to run out of resources on longer drives. A hard reset (holding the power button for 10 seconds) usually restores function temporarily. JLR releases over-the-air updates to address known bugs, but the underlying issue persists on some vehicles. In most cases this is an annoyance rather than a costly repair, though hardware module replacement (if needed) runs around €500.
High PHEV complexity brings above-average repair risk
The Discovery Sport P300e adds a layer of hybrid-specific components (ERAD, HV battery, HV coolant heater, DC-DC converter, onboard charger) on top of an already complex platform. Each of these can fail independently, and repairs typically require specialist tools and JLR dealer access. The 1.5 Ingenium petrol engine itself is less problematic than the 2.0 diesel's timing chain issues, but oil dilution from PHEV driving patterns needs active management. Budget carefully for potential hybrid-system repairs, especially if the car is outside its 3-year vehicle warranty.
Service history
Complete Land Rover dealer or specialist records essential. Verify oil changes at correct intervals.
Tires
Check tread depth, age (date codes), and uneven wear. The P300e is heavier than the standard model due to battery weight.
Cold start
Start the engine cold. Listen for unusual rattling or knocking from the 1.5 three-cylinder.
Test drive
Drive for at least 30 minutes in both EV and hybrid modes. Include motorway speeds.
Specific for this vehicle
Test EV mode thoroughly
With battery charged, drive in pure EV mode for at least 10 minutes. Watch for 'EV temporarily not available' message. Test with climate control on and off.
Check charging function
Plug in and verify the car accepts charge. Watch for initialization failures or premature cutoffs. Test scheduled charging if possible.
Inspect for ERAD warning messages
Drive on varying surfaces and check for AWD-related warning lights. Loss of electric rear axle drive means the ERAD may be failing.
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Check 12V battery and dashboard warnings
Look for multiple warning lights on startup. Persistent warnings about charging system or battery may indicate DC-DC converter issues.
Verify remaining electric range vs stated capacity
A fully charged P300e should show approximately 40-55 km of electric range. Significantly less may indicate battery degradation.
Check oil level and condition
Oil level above maximum or strong fuel smell in the oil indicates oil dilution from frequent short engine runs. This needs addressing.
Verify recall completion (D035 and DC-DC converter)
Contact JLR with VIN to confirm all safety recalls have been completed, particularly the EPICB software recall and DC-DC converter recall.
Recalls and Technical Service Bulletins
EPICB software fault causing power loss in EV mode (Safety Recall D035, 2023-2026 models)Verify completed
Instrument cluster unit display switching between MPH and KPH (2020 models)Verify completed
Touchscreen blank at startup, rearview camera not displaying (2023 models)Verify if applicable
Contact a JLR dealer with the VIN to verify all recalls have been completed. The DC-DC converter recall is particularly important as it can cause complete loss of drive power and exterior lighting.
Warranty Status
Factory warranty (3 years / unlimited km)Expired on 2020-2022 models, may remain on 2023+ models
High-voltage battery warranty8 years / 160,000 km with 70% capacity guarantee
Rust perforation warranty6 years from first registration
Extended warrantyAvailable through JLR dealers, recommended for this model
The 3-year factory warranty is generous with unlimited mileage but has expired on early P300e models (2020-2022). The 8-year HV battery warranty may still cover the traction battery on all P300e models. Extended warranty is strongly recommended given the high cost of PHEV-specific component repairs.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
