TF-70SC, F21-250, AWF6F25, TF-72

The Aisin TF-70SC, also identified within Aisin documentation as the F21-250 family and commercially as AWF6F25, is a compact 6-speed conventional automatic transmission developed for transverse front-wheel-drive vehicles. It uses a hydraulic torque converter with controlled lock-up clutch, planetary gearsets and an electronically controlled hydraulic valve body. Aisin's current transmission catalogue directly groups F21-250, TF-70SC and AWF6F25 within the same transmission family.

Specification: 6-speed automatic • Aisin F21-250 family • TF-70SC / AWF6F25 • Hydraulic torque converter with lock-up clutch • Planetary geartrain • Electronically controlled hydraulic valve body • Transverse installation • Front-wheel drive • Integrated differential • Approx. 220 Nm documented torque capacity for TF-70SC applications • Approx. 6.1-litre total fluid capacity on documented variants.

Commonly fitted to selected Peugeot and Citroën vehicles, particularly models using approximately 1.6–2.0-litre engines, with applications including selected Peugeot 308, 3008, 408, 5008 and 508 and Citroën C4/C4 Picasso and C5 variants. Closely related TF-71SC and TF-72SC transmissions also sit within Aisin's F21-250 family, so the individual transmission code, vehicle application and transmission identification should always be confirmed before ordering replacement parts.

Common Faults

Common TF-70SC/AWF6F25 problems include valve-body wear, hydraulic pressure-control and solenoid faults, torque-converter lock-up clutch problems, internal clutch wear and transmission fluid contamination or deterioration. Typical symptoms include harsh or delayed shifting, particularly during lower-gear changes, slipping or shift flare, harsh engagement of Drive or Reverse, loss of drive, torque-converter lock-up judder and transmission fail-safe operation.

Common Fault Codes

The exact DTC set can vary according to the vehicle manufacturer and TCM calibration, so these codes should be treated as common diagnostic categories associated with this transmission rather than implying every TF-70SC/AWF6F25 application will report identical codes.