Peugeot 3008: EAT8 Torque Converter Clutch Judder at Cruise

The Aisin-sourced EAT8 8-speed automatic transmission used in the 3008 P84 suffers from torque converter clutch (TCC) shudder at steady highway cruise speeds, typically between 80 and 110 km/h. The TCC engages to improve fuel efficiency but the clutch pack applies inconsistently, producing a low-frequency vibration or shudder felt through the floor, seat, and steering wheel. The condition is often confused with an engine misfire or road vibration. PSA and Aisin both acknowledge the issue through service documentation and the primary initial repair is a transmission fluid drain and refill using the correct Aisin AFC Dexron HP specification ATF — incorrect fluid or degraded fluid is a major trigger. Where fluid service does not resolve the shudder, torque converter replacement is required. Some vehicles have also required transmission software recalibration via dealer scan tool.

• Low-frequency vibration or shudder at 80-110 km/h steady cruise
• Sensation similar to driving over rumble strips at constant highway speed
• Shudder disappears when accelerating or decelerating out of cruise lock-up speed
• No fault codes in most mild cases — intermittent P0740/P0743 in severe cases
• Vibration felt through seat, floor, and footwell rather than steering wheel

1. 1

   Take the vehicle on a steady cruise between 80 and 110 km/h on flat road at light throttle — maintain constant speed for at least 60 seconds.

2. 2

   Any low-frequency vibration or shudder at this condition is the TCC fault.

3. 3

   Check transmission fluid condition if accessible (EAT8 is nominally sealed but fluid condition matters).

4. 4

   Ask whether the transmission has had a fluid service or software update at a Peugeot dealer.

Parts involved: Torque converter, Clutch.

$550 to $5,200 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Does the car vibrate or shudder at steady highway speeds around 90-100 km/h?”
• “Has the transmission fluid been replaced and with what specification fluid?”
• “Has a dealer performed any EAT8 software or calibration update?”
• “Has the torque converter ever been replaced or inspected?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.