Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-P029900

Condition
The Engine control module (ECM) regulates the turbo pressure using a turbo control valve.
The control module can detect small faults in boost pressure regulation over a longer period of time and larger faults in a shorter time.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The actual turbo pressure is less (approx. 15 kPa for 10 seconds) than what the Engine control module (ECM) regulated (maximum regulation achieved).
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Normal load (driving).
- Boost pressure (approx. 30 kPa above atmospheric pressure).

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute value
- None.

Possible source
- Damaged turbocharger (TC) control valve.
- Air leakage in the intake system.
- Damaged turbo charger (TC).
- Damaged relief valve.
- Hoses between the pressure servo for the boost pressure control (BPC) valve and the turbocharger (TC) control valve have come loose or are blocked or damaged.
- Sticking boost pressure control (BPC) valve.
- Damaged boost pressure control (BPC) valve pressure servo.

Fault symptom[s]
- Driving/Poor performance/lacks power