"EL. POWER CONTROL - VISIT WORKSHOP" on dashboard

[garystu1965]

My mate has got this error after fitting a tuning box on his C220 CDi.
If he takes it out it's ok. Anyone ever had this error. If so please PM me...

 

[grober]

Suggest he contacts the maker of his "box of tricks" They should know, and if they don't-------?????

 

[panason1c]

My mate has got this error after fitting a tuning box on his C220 CDi.
If he takes it out it's ok. Anyone ever had this error. If so please PM me...

Probably the on-board diagnostics picking up an overfuel/overboost flag.