MAN fault codes

dowahdiddyman:
Mine keeps throwing fault codes at me,03778/10 and 03779/10. When these come up its always when im in the final stages of braking and it also de-rates for a few seconds. Sick of reporting it to Man service when it goes in to be honest.

3779-10 and 3778-10 could point towards possible injector failure. Try changing your filters, cleaning out the fuel lines etc but you’ll more than likely need to get a leak-off test carried out to diagnose which (if any) injectors are at fault and go from there.

The reason it de-rates the engine output is to minimise damage to the engine if there is a problem with the fuel system. MAN refer to it as ‘torque limitation’