VOLVOUU All Engines (2010 Emissions) Fault Code: SPN 1127 FMI 14 PID: PSID 98 Engine Turbocharger 1 Boost Pressure

The engine control module (ECM) monitors the intake manifold pressure (IMP) sensor and controls the boost air system (mainly controlled by the VGT) and the engine turbocharger compressor bypass valve. The ECM also uses parameters like engine speed (RPM) and turbocharger speed to make a calculation of the IMP. This estimated value should not differ too much from the measured value.

Conditions for diagnostic trouble code (DTC):
1) Failure to start regulation of Variable Geometry Turbo (VGT) or Exhaust Gas Recirculation (EGR) system

Observable symptoms
1) Poor response

Probable cause
1) Air leakage
2) VGT actuator
3) Oil pressure

Detailed information
1) This DTC is activated if the regulation has not started after 35?s
2) This DTC is probably only set if the vehicle is used used for varying driving (varying engine speed and load)