AWF8F35, EAT8, TG-81SC

The EAT8 / AMN8 is an 8-speed conventional automatic transmission from the Aisin transverse automatic transmission family, closely associated with the AWF8F35 / TG-81SC architecture. In Peugeot, Citroën and DS applications it is marketed as EAT8 (Efficient Automatic Transmission 8). It uses a hydraulic torque converter with lock-up clutch, planetary gearsets and an electronically controlled hydraulic valve body. Stellantis documentation confirms that the EAT8 was developed with Japanese transmission specialist Aisin.

Specification: 8-speed automatic • EAT8 / AMN8 • Aisin AWF8F family • TG-81SC related family • Hydraulic torque converter with lock-up clutch • Planetary geartrain • Electronically controlled hydraulic valve body • Transverse installation • Front-wheel-drive applications, with related Aisin variants also supporting AWD • Electronic shift-by-wire on documented EAT8 applications • Designed to improve ratio spread, efficiency and shift quality compared with the preceding EAT6.

Commonly fitted to selected Peugeot, Citroën and DS vehicles, including applications within the Peugeot 208, 308, 508, 2008, 3008 and 5008 and Citroën C4, C5 Aircross and Dispatch ranges, depending on engine, model year and transmission version. AMN8 is documented by Peugeot as an 8-speed automatic designation, while 20GM13, 20GM22 and 20GT88 are application-specific PSA transmission identifiers rather than universal Aisin model names. The exact transmission code, vehicle application, VIN and transmission identification should therefore always be confirmed before ordering replacement parts.

Common Faults

Common faults associated with this transmission family include valve-body and hydraulic pressure-control problems, torque-converter lock-up clutch wear, solenoid faults, internal clutch wear, speed-sensor faults and transmission fluid deterioration or contamination. Typical symptoms include harsh or delayed shifting, shift flare, slipping, judder or vibration during torque-converter lock-up, delayed Drive/Reverse engagement, transmission warning messages and limp-home operation.

Common Fault Codes

EAT8 is fitted across different PSA/Stellantis vehicles and calibrations, and the exact manufacturer-specific DTC set can vary by TCM and application. Please use these as common diagnostic categories/codes associated with faults of this type rather than assuming that every EAT8/AMN8 variant will report all ten codes identically.