The latest software calibration TTQ0V25KC3 update was rolled out by Hyundai specifically to fix severe drivability bugs and transmission durability flaws found in the earlier factory software.
• 2nd-to-3rd Gear Flare: Stopped the engine RPMs from suddenly spiking (slipping) and slamming hard during the shift from 2nd to 3rd gear under acceleration.
• Highway Torque Converter Shudder: Eliminated a severe cabin vibration—which felt like driving over rumble strips—occurring at steady speeds between 70–90 km/h in 5th gear.
• Delayed Kick-Down: Fixed a dangerous 2-second delay and violent jerk when smashing the accelerator pedal to overtake.

software update for TQ A2 2.5 diesel VGT 2WD 5at
drive feeling and Vibration improvement TCU
Before TTQ0V25KC2 calibration
after update TTQ0V25KC3 calibration

• 95440-4CAA0: This was the original, factory-installed Transmission ECU part number shipped on early-to-mid production models of this specific drivetrain series.
• 95440-4CAA1: This is the official direct supersession/updated part number from Hyundai Mobis. It was introduced to replace the -4CAA0 variant, usually incorporating minor software updates, improved shift mapping logic, or hardware reliability revisions