Engine control unit or electronic control unit.
engine controle unit
Freightliner and Volvo.
It means you need to hook up to a computer with the Volvo software and pull codes.
#1346030
Speed is controlled by the ECU.
on most Chevy trucks the ecu is located behind the glovebox
It means you should go to a shop which has the appropriate software for your engine, and have them look up faults.
Engine check urgently
To remove the ECU from a Volvo S70, first disconnect the negative battery terminal to ensure safety. Then, locate the ECU, which is typically found behind the passenger side kick panel. Remove any necessary screws or bolts securing it in place, and carefully disconnect the wiring harnesses attached to the ECU. Once detached, you can pull the ECU out for replacement or repair.
VOLVO 220f I ECU błąd sieci
You take it to a Volvo Dealer and they plug in a laptop and reprogram some parameters on the ECU in the truck.
It is called the ECU, (Engine Control Unit)