Volvo All Engines (2013 Emissions) Fault Code: U300257 PID: EMS Vehicle Identification Number

Posted by PerDiezel Solutions on June 6, 2026

The Idle Validation Switch is open at the idle position and transmits no voltage to the (VECU) Vehicle Electronic Control Unit. At approximately 1-13% pedal position the Idle Validation Switch closes and completes the circuit to the (VECU) Vehicle Electronic Control Unit.
The (VECU) Vehicle Electronic Control Unit then sends a voltage signal to the Engine Control Module (ECM) indicating accelerator pedal position. If both communication links (J1939, J1587) are faulty the pedal demand functionality enters limp-home. During limp-home the (IVS) Idle Validation Switch is used for ramping requested torque.

Conditions for diagnostic trouble code (DTC):
1) Incorrect vehicle identification number (VIN) from vehicle electronic control unit (ECU)

Observable symptoms
1) Engine does not start

Probable cause
1) The electronic control unit (ECU) has a software fault or the wrong software version

Volvo All Engines (2013 Emissions) Fault Code: U300049 PID: EMS Electronic Control Unit

Volvo All Engines (2013 Emissions) Fault Code: U300046 PID: EMS Electronic Control Unit

Volvo All Engines (2013 Emissions) Fault Code: U300045 PID: EMS Electronic Control Unit

Volvo All Engines (2013 Emissions) Fault Code: U300044 PID: EMS Electronic Control Unit

Volvo All Engines (2013 Emissions) Fault Code: U300041 PID: EMS Electronic Control Unit

Volvo All Engines (2013 Emissions) Fault Code: U300001 PID: EMS Electronic Control Unit

WARNING!