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Pivi Pro OS 4.3.4

OS 4.3.4 — The V8 Incident

Known regressions Released January 15, 2026

Variants

90, 110, 130

Powertrains

All

What It Fixes

  • Charging performance at low temperatures
  • Hybrid drive behaviour at low speeds
  • Condition-based servicing calculations
  • Fan noise reduction after power-off
  • Shift quality and performance improvements (Defender V8)
  • Calibration for power seats
  • Chassis systems refinements
  • Propulsion system improvements

What It Breaks

  • V8 gearbox lockup: 2024+ Defender V8 transmissions locked in 2nd gear after installation (2023 V8 owners reported updating without issue)
  • Affected vehicles displayed check engine light and gearbox fault warning
  • Vehicles could not be driven normally — required flatbed tow to dealer
  • JLR deployed 4.3.4T hotfix via dealer-only installation (not OTA)
  • Fully resolved in OS 4.4.0

Community Sentiment

The most controversial SOTA update in L663 history. 2024+ V8 owners reported gearboxes locking in 2nd gear after installation. Multiple owners required flatbed towing to dealers. JLR acknowledged the issue, paused the V8 rollout, and deployed a 4.3.4T hotfix via dealers. 2023 V8 owners reported updating without issue. No regressions reported from non-V8 variants.

Editor's Note

This is the update that shook V8 owner confidence in Land Rover's SOTA process.

The official changelog promised "shift quality and performance improvements (Defender V8)." What it delivered, for 2024-2025 V8 owners, was a gearbox that locked in 2nd gear. The check engine light came on. The transmission fault warning appeared. And the vehicle couldn't be driven. Owners needed flatbed tows to dealerships — you can't traditionally tow a Defender, and jump-starting doesn't work when the issue is software, not battery.

JLR acknowledged the problem and released 4.3.4T, a transmission-specific hotfix available only through dealers. Some owners reported that logging out of their Pivi account and logging back in triggered the 4.3.4T update OTA, but most required a dealer visit.

The fix was later confirmed in OS 4.4.0, which all V8 owners should update to.

Non-V8 owners: No regressions have been reported from non-V8 variants. Forum posts confirm non-V8 Defenders continued receiving the update even after JLR paused it for V8s.

Verdict: Skip if V8 (update directly to 4.4.0). Install if non-V8. If you're a V8 owner still on 4.3.3 or earlier, skip 4.3.4 entirely and update to 4.4.0 or later when prompted.

This entry reflects community-reported experience and editorial synthesis. It is not an official Land Rover communication. Verdicts reflect the editor's assessment based on available community data, not a manufacturer recommendation.

Sources

Last updated: April 5, 2026