Power loss in Nissan Patrol GU 3Ltr 2007

[jiandaroo]

We use the Nissan Patrol to tow a caravan, never had any problem with this until now! The vehicle will tow ok then out of the blue will lose approx. 50% pulling power on the flat even more uphill. Have Not changed the caravan but have recently had SOLAR panels installed. No problem with the vehicle without the caravan ,have tried to disconnect the solar but the problem is still there????????
It is obviously affecting the engines computer.
Does anyone have ANY ideas?

[4bye4]

Might be going into limp mode mate. If you lift off and then accelerate again does it come good?

[GQtdauto]

I think the panels would be unrelated to your issue , maf sensor dirty or on its way out maybe .

[the evil twin]

Agree... 95% it will be going into limp mode.
Check for codes if you have a scanner, clean the MAF, disconnect the Battery, see how it goes then.