Volvo All Engines (2017 Emissions) Fault Code: P003A99 PID: EMS Turbocharger/Supercharger Boost Control “A” Position Exceeded Learning Limit
Volvo All Engines (2017 Emissions) Fault Code: P003A99 PID: EMS Turbocharger/Supercharger Boost Control “A” Position Exceeded Learning Limit
The (VGT) Variable Geometry Turbocharger Actuator is a self-contained component with motors, sensors and a control unit.
The (VGT) Variable Geometry Turbocharger uses a movable nozzle to adjust the intake manifold pressure for various operating conditions. Nozzle movement is controlled by an actuator mounted on the tubocharger. When the Engine Control Module (ECM) Relay is energized, a fuse supplies battery voltage to the (VGT) Variable Geometry Turbocharger and the unit is grounded by means of the engine block.
Conditions for diagnostic trouble code (DTC):
1) Mechanical system not responding properly
Probable cause
1) Seized linkage
2) Foreign objects caught in the mechanism
3) VGT actuator
4) Turbo nozzle binding due to soot or damaged turbo
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