Mitsubishi unable to help

I am the owner of a 2021 Mitsubishi Triton, this is the 3rd time it has gone into Limp mode and they can't tell me what is wrong, no diagnostic fault, they blame me for possible fuel contamination but I have no control over the fuel we buy, diesel can legally be blended., But it is my fault just so the vehicle factory guarantee don't pay for repairs. They have changed diesel, still in limp mode, injectors were tested by another company, no fault found, changed throttle body no change, been 2 weeks without transport.