Audi's plug-in hybrid Q5 pairs a 2.0 TFSI EA888 petrol engine with an electric motor and a 14.1 kWh battery (17.9 kWh gross / 14.4 kWh usable on the updated model), producing a combined 367 hp through a 7-speed S tronic and quattro all-wheel drive. Introduced in 2019 as the 55 TFSI e, it offers around 40-50 km of electric-only range (WLTP) and strong combined performance. The powertrain is complex, combining ICE, hybrid module, high-voltage battery, and dual-clutch gearbox in one package.· more· less
Strong 367 hp combined output40-50 km electric range (WLTP)
HV battery fire risk recalls (2019-24)Complex hybrid adds failure points
Buy if: You want a powerful, efficient premium SUV for mixed driving and can verify the battery fire recall and full hybrid system service history.
Avoid if: You rarely charge the battery (negates fuel savings and accelerates 12V drain issues) or want simpler, lower-risk ownership.
Battery cells may overheat during charging due to manufacturing deviations at the supplier · more· less
A major recall affects Q5 55 TFSI e models produced between January 2021 and August 2023. Manufacturing deviations in battery cell production can cause thermal overload during charging, potentially leading to fire. Audi's remedy involves installing advanced onboard diagnostic software that monitors battery module performance and alerts the driver before problems develop. Until the recall is completed, Audi advised owners not to charge the battery. The remedy replaces any battery modules found to be defective and adds the monitoring software; it is not a software update alone. If a battery module is actually damaged, replacement costs approximately €10,000-12,000 including labor at an Audi dealer. Verify with Audi using the VIN whether this recall has been completed. Cars built before January 2021 fall outside campaign 93AB, but the separate 93AD battery fire campaign reaches back to 1 August 2019, so an earlier car still needs checking.
Water pump and thermostat housing failure
€800 - 1,5002 of 7
Plastic water pump housing cracks or leaks coolant, typically between 60,000-100,000 km · more· less
The EA888 Gen 3B engine uses a water pump with a plastic housing that degrades over time. Coolant leaks from the water pump housing or the integrated thermostat housing are widely reported across all EA888-equipped Audi models. Symptoms include coolant warning light, visible coolant drip under the car, or engine overheating. The part costs approximately €300-500 due to the integrated electric design, and labor runs 3-5 hours because of accessibility in the engine bay. Independent garage repair typically costs €800-1,100, while an Audi dealer charges €1,200-1,500. A previous recall for earlier Q5 models addressed coolant pump failures, and Volkswagen Group extended the water pump warranty to 8 years/80,000 miles in the US, though European coverage may differ. Replace both water pump and thermostat housing together when either fails.
Charging control unit / port failure
€800 - 1,4003 of 7
Charging port locking solenoid or control unit fails, preventing the car from charging · more· less
Multiple Q5 PHEV owners report intermittent charging failures where the locking pin solenoid cycles three times then errors out with a red light at the charging port. The MyAudi app shows errors like 'Locking error in charging system' and the MMI displays 'There is an error in the wired charging system'. The issue is not specific to any charger type and can be intermittent, making diagnosis difficult. Audi Technical Assistance typically recommends replacing the charging control unit. Complete charging port replacement costs approximately €1,400 at a dealer. Some owners have also reported the plastic tip of the charger prong melting due to port overheating, though this is less common.
12V battery drain
€200 - 4004 of 7
12V auxiliary battery drains if the car is not driven regularly or not plugged in frequently · more· less
The Q5 PHEV has a higher parasitic drain on the 12V battery than non-hybrid variants because the high-voltage system management modules remain active. If the car is driven primarily in EV mode, the 12V battery may not be adequately recharged because the ICE alternator runs less frequently. Owners who leave the car parked for more than 7-10 days without charging often find a flat 12V battery. The 12V battery relies on the DC-DC converter from the HV battery for charging, and if the HV battery state of charge is low, the 12V battery receives insufficient charge. Solution: keep the car plugged in when parked for extended periods, or use a quality trickle charger. A replacement 12V AGM battery costs €200-400. This is an inherent characteristic of PHEVs rather than a defect, but it catches many owners off guard.
S-tronic (DL382) mechatronic issues
€1,500 - 3,5005 of 7
Mechatronic unit solenoids degrade, causing jerky shifts, harsh engagement, or limp mode · more· less
The 7-speed DL382 S tronic is a wet-clutch dual-clutch transmission and generally more robust than the DQ200 dry-clutch unit. However, the mechatronic unit develops issues between 60,000 and 120,000 km, particularly if gearbox fluid has never been changed. Common symptoms include a jolt when coming to a stop (as the gearbox shifts from second to first gear), delayed engagement, and gearbox malfunction warnings. Specialist repair of the mechatronic unit costs €1,500-2,500. Full clutch pack replacement runs €2,500-3,500 at a dealer. Audi UK schedules S tronic oil replacement at 40,000 or 60,000 miles depending on the model, and specialists recommend changing it every 60,000 km. The added torque from the electric motor in the PHEV variant may accelerate clutch wear compared to the non-hybrid models.
HV battery capacity degradation
€0 - 10,0006 of 7
Electric range gradually decreases over time, with some owners reporting 20-30% range loss after 3-4 years · more· less
Some Q5 PHEV owners report noticeable range degradation over 3-5 years of ownership. New cars typically achieve 38-45 km of electric range, but after 60,000-100,000 km, some owners report only 28-32 km. A few cases report up to 50% capacity loss within 2.5 years, though these appear to be outliers. Audi Germany covers the HV battery for 8 years / 160,000 km against defects but expressly excludes normal capacity reduction; the 70% capacity threshold applies to Audi's battery-electric models, not this PHEV. Audi UK instead covers PHEV battery degradation for 5 years / 100,000 miles, so check which terms apply in the car's market. Outside warranty, a battery module replacement costs €8,000-10,000. To prolong battery life, avoid frequent fast charging, maintain the state of charge between 20-80% where possible, and keep software updated. Cars driven predominantly on short electric trips with regular charging tend to hold range better than those rarely charged.
Front control arm bushing wear
€600 - 1,2007 of 7
Lower control arm bushings wear causing knocking over bumps, typically after 80,000-120,000 km · more· less
The front suspension lower control arm bushings on the Q5 FY wear over time, especially on cars driven on rough roads. The PHEV variant is heavier than standard Q5 models (approximately 2,100 kg vs 1,800 kg), which accelerates bushing degradation. Symptoms include knocking or clunking noises when going over bumps at low speed. Audi does not sell replacement bushings separately, meaning the entire control arm assembly must be replaced. Parts cost approximately €100-250 per arm (aftermarket) or €300-400 (OEM), with labor around €300-500 for both sides. Aftermarket arms from Lemforder or Meyle offer good quality at lower cost. A four-wheel alignment (€100-150) should follow any control arm work.
Reliable ICE base, but hybrid complexity adds risk
The EA888 engine and quattro drivetrain are proven and well-documented. However, the plug-in hybrid system adds significant complexity: the two HV battery fire recalls (93AB for January 2021 to August 2023 and 93AD for August 2019 to August 2024 production), charging system failures, 12V battery drain, and eventual battery capacity degradation are all hybrid-specific concerns that non-PHEV Q5 variants do not face. The S-tronic gearbox and water pump/thermostat remain shared weak points with the petrol Q5 45 TFSI. Regular charging, proactive S-tronic fluid changes, and verifying all recalls are completed are essential for trouble-free ownership.
Service history
Complete Audi dealer or specialist records essential. Verify oil changes, S-tronic fluid changes, and hybrid system service.
Tires
Check tread depth, age (date codes on sidewall), and uneven wear patterns. The PHEV is heavier and wears tires faster.
Cold start
Start the ICE engine cold. Listen for unusual noises, rough idle, or warning lights in the first 30 seconds.
Test drive
Minimum 30 minutes including both EV mode and hybrid mode at highway speeds. Let gearbox reach operating temperature.
Specific for this vehicle
Verify both HV battery fire recalls completed
Contact Audi with VIN. Campaign 93AB covers cars built January 2021 to August 2023 and campaign 93AD covers 1 August 2019 to 31 August 2024, so almost any car in this range needs checking.
Check electric range on a full charge
Fully charge the battery before the test drive. Note the displayed range. Below 30 km in mild weather suggests significant degradation.
Test the charging system
Plug in and verify the car initiates charging without errors. Watch for red light at charging port or error messages on MMI.
+ 3 more checksShow less
Inspect coolant level and condition
Low coolant or brown/milky appearance indicates water pump or thermostat housing failure. Check for coolant residue under the car.
Check S-tronic gearbox behavior
Drive for 20+ minutes. Feel for jerky shifts, jolt when stopping, or hesitation during acceleration. Check for gearbox malfunction warnings.
Listen for suspension knocking
Drive slowly over speed bumps and rough surfaces. Knocking from the front indicates worn control arm bushings.
Recalls and Technical Service Bulletins
High-voltage battery overheating risk during charging (campaign 93AB, January 2021 - August 2023 production)Critical - verify completed
High-voltage battery fire risk (campaign 93AD, 1 August 2019 - 31 August 2024 production)Critical - verify completed
Contact Audi with the VIN to verify all recalls have been completed. The high-voltage battery overheating recall is particularly critical for 2021-2023 models. Until it is completed, Audi advises not to charge the battery.
Warranty Status
Factory warranty (2 years)Expired on most used examples
HV battery warranty8 years / 160,000 km against defects (Germany); UK covers degradation 5 years / 100,000 miles
Rust perforation warranty12 years
Most used Q5 55 TFSI e models are outside the standard 2-year factory warranty. The HV battery warranty (8 years / 160,000 km) may still be active on 2019-2022 models. Verify the exact start date and remaining coverage with Audi using the VIN. Extended warranty options are available through Audi dealers.
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.
