The GWM Tank 400 or Tank 400 () is a mid-size SUV produced by Great Wall Motor. It is the third model to be introduced under the Tank marque.
The Tank 400 debuted in 2021 at Auto Shanghai in parallel with the Tank 500. Like other SUVs, the vehicle has a monocoque frame and a double-wishbone front suspension. The interior trim is the same as that of the 500. Sales began on 25 August 2023 in China.
The 400 is equipped with a two-liter, four-cylinder turbocharged gasoline engine producing and a torque of , which is paired with a nine-speed automatic transmission. There is also a plug-in hybrid Tank 400 Hi4-T (PHEV) with a electric motor and a torque of ; the Hi4-T module would also be installed on the Tank 300 and Tank 500. According to the WLTC cycle, the pure electric range is . The fording depth for an SUV is . The car is capable of towing a trailer weighing 2.5 tons. The trunk volume is .