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E39 / P0299 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp Performance loss.

  P0299 00


Turbocharger Underboost Detected

Fault symptom

Malfunction Indicator Lamp

Performance loss.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Engine running.
Engine speed between 1600 and 6000 rpm.
Charge Air Control
Requested boost pressure between 140-300 kPa.
Atmospheric pressure between 60 and 120 kPa.
"Limp home" function not active.
The following diagnostic trouble codes may not be generated:
P0010, P0011, P0013, P0014
P0033, P0034, P0035
P0111, P0112, P0113, P0114
P0116, P0117, P0118, P0119
P0236, P0237, P0238
P0243, P0245, P0246

Fault criteria:

Current boost pressure falls below requested boost pressure for more than 1,5 s.

OK report:

Drive the car in 3rd gear, even acceleration at 1900 rpm. Then full gas acceleration (pedal not depressed 100%) up to 5000 rpm.

Diagnostic help

Diagnosis regards:

Turbo system fault causing high boost pressure.

Functions in the diagnostic tool related to the fault:

Test value:
Charge Air Absolute Pressure
Atmosphere Absolute Pressure
Charge Air Control Valve

Activation:
Charge Air Control Valve
(See also description of readings/activations in diagnostic tool)