Volvo All Engines (2017 Emissions) Fault Code: P029900 PID: EMS Turbocharger/Supercharger Underboost
Volvo All Engines (2017 Emissions) Fault Code: P029900 PID: EMS Turbocharger/Supercharger Underboost
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) Charge pressure Low
Observable symptoms
1) High soot level
2) Low Power
Probable cause
1) Charge air system leakage
2) Turbocharger
3) Charge air pressure sensor
4) Air Cleaner (ACL)
5) Faulty VGT position – The sensor shows a more closed position than the actual position
6) Faulty EGR position – Valve more open than it is supposed to
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