Audi Q5 35 TFSI Mk3 Reliability

Audi's third-generation Q5 launched in 2024 on the new Premium Platform Combustion (PPC) architecture, paired with the EA888 evo5 2.0 TFSI and 48V MHEV plus mild-hybrid system. Early production has been dominated by software issues affecting the new electronic architecture, prompting a major dealer-applied software baseline (TSB 2079690 / KD2) that reflashes 30+ control modules.· more· less

EA888 evo5 well-developed engine Strong factory warranty still active

Early-build software gremlins Engine stalling reports after start/stop

Buy if: You want a new-platform premium SUV under factory warranty and can verify the KD2 software baseline has been applied.

Avoid if: You want a settled, proven platform — long-term data on the PPC architecture and MHEV plus does not yet exist.

Maintenance costs

€1,150 - €2,050/year

15,000 km/year

Fixed costs

€800-1,350

Risk buffer

€350-700

Common Problems

PPC platform software faults

€0 - 8001 of 4

MMI freezes, blank screens, false ADAS warnings, wireless CarPlay drops on early-build cars · more· less

The new PPC electronic architecture launched with a wide range of software bugs. Owners on AudiWorld and myaudiq5.com forums report random ADAS error showers (the 'Christmas tree' display), MMI screen freezes and reboots, wireless Apple CarPlay and Android Auto dropping out, and false warning messages. Audi released TSB 2079690 (the KD2 baseline software update) which reflashes 30+ control modules to version 3.10.00. Many owners report substantial improvement after the update, though not all bugs are eliminated. Under warranty, this is dealer time only and costs the owner nothing in money, but repeated dealer visits are common during the first year. Out of warranty, diagnostic and reflash time at Audi runs €150-300 per visit. Verify which software baseline is installed before purchase.

Engine stall after start/stop or extended idle

€0 - 1,5002 of 4

Reports of stalling after start/stop re-engagement and flooding/misfire after long idle · more· less

A subset of owners report the engine stalling shortly after the start/stop system restarts it, including at busy intersections and roundabouts. A separate cluster of reports describes excess fuel flooding the cylinders after extended idling, producing severe misfire and a no-start condition requiring a tow. Audi dealers have acknowledged the flooding issue as known but as of early 2026 there is no confirmed permanent fix. Under warranty this is fully covered; outside warranty, diagnosis and any high-pressure fuel system or injector work can reach €1,000-1,500. The 48V MHEV plus belt-starter integration is suspected as a contributing factor in the start/stop stalls.

Panoramic sunroof glass breakage

€1,200 - 2,5003 of 4

Isolated reports of panoramic glass shattering without impact while driving · more· less

A small number of owners report panoramic sunroof glass breaking without external impact, consistent with a broader industry pattern of thermally stressed laminated panoramic glass failing on premium SUVs. Not a current recall on the Mk3 Q5 as of early 2026, but the pattern is documented enough to warrant a careful inspection of the glass for edge chips, sealing condition, and the drainage channels. Replacement glass and labor at an Audi dealer typically runs €1,200-2,500 depending on whether the surrounding trim and seals also need work. Comprehensive insurance usually covers this if it occurs.

MHEV plus 48V system component failure

€800 - 3,0004 of 4

48V belt-starter generator, DC-DC converter, or lithium-ion battery faults · more· less

MHEV plus integrates a 48V belt-starter generator, a 48V lithium-ion battery, and a DC-DC converter that powers conventional 12V loads. This system enables engine-off coasting and electric crawling at low speed. As a new system with limited long-term field data, failure modes are still being characterized. Early TSBs across the PPC family address DC-DC converter calibration and 48V battery management. Out-of-warranty replacement of the 48V battery can reach €1,500-2,000 in parts alone, with the belt-starter generator and DC-DC converter at similar levels. Symptoms typically include MHEV warning messages, loss of engine-off coasting, and harsher start/stop transitions.

New platform - software risk dominates, mechanical risk unproven

The Q5 Mk3's biggest risk is the immature PPC electronic architecture and MHEV plus integration. Most current issues are covered by the active 4-year Audi warranty and the KD2 software baseline addresses many of them. Mechanical long-term reliability of the EA888 evo5 cannot yet be assessed - too few high-mileage examples exist. Buyers should verify warranty status, the KD2 update history, and prioritize cars built after mid-2025 production when most launch bugs were addressed at the factory.

Pre-Purchase Inspection Checklist

General checks

Service history
Audi dealer records essential on a near-new car. Verify scheduled service stamps and any unscheduled software/warranty visits.
Tires
Check tread depth and date codes. OEM 19-inch tires on the Q5 are expensive to replace and uneven wear hints at alignment or suspension issues.
Cold start
Start engine completely cold. Listen for unusual MHEV plus belt-starter noise and confirm smooth idle without misfire.
Test drive
Minimum 30 minutes with several start/stop cycles. Watch the dashboard for ADAS error messages or MMI freezes.

Specific for this vehicle

Verify KD2 software baseline (TSB 2079690) applied
Ask the dealer to confirm vehicle software version 3.10.00 or later. Pre-KD2 cars have a long list of unresolved bugs.
Cycle start/stop multiple times during test drive
Drive 20+ minutes in stop-and-go traffic. Stalling after restart is a known issue worth provoking before purchase.
Test MMI, CarPlay, and ADAS systems in full
Connect wireless CarPlay, run lane keep and adaptive cruise. Look for screen freezes, reboots, or false warnings.

+ 3 more checksShow less

Inspect panoramic sunroof glass carefully (if equipped)
Look for edge chips, stress cracks, or sealing issues. Check the drainage channels are clear.
Confirm 48V MHEV plus system operates correctly
Watch for engine-off coasting working as designed. Any MHEV warning message means the system needs diagnosis.
Check Audi warranty status and remaining coverage
Confirm the 4-year factory warranty is intact and transferable. This is the buyer's main protection on this platform.

Recalls and Technical Service Bulletins

TSB 2079690 / KD2 combined software baseline update (2025 Q5/SQ5) Verify applied

DC-DC converter and 48V battery management updates (early Mk3 production) Verify completed if applicable

The Mk3 Q5 is a new platform and active TSB and software campaigns are evolving rapidly. Contact an Audi dealer with the VIN to verify all updates have been applied, particularly the KD2 (TSB 2079690) software baseline.

Warranty Status

Factory warranty (2 years) Active on all Mk3 Q5 cars

Audi mobility/breakdown cover Active for warranty period

Rust perforation warranty 12 years from registration

Paint warranty 3 years from registration

All Q5 Mk3 vehicles are still within the original Audi 2-year factory warranty as of early 2026. This is the buyer's single most important protection given the platform's early software and electrical issues. Extended Audi warranty cover is available and worth considering before the factory cover expires.

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.

Audi Q5 35 TFSI Mk3

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