DTC Advanced Diagnostics: P0299
DTC P0299:Turbocharger Underboost Problem

General Description


The powertrain control module (PCM) controls the turbocharger control system to control boost pressure. When the difference between the target boost pressure and actual boost pressure is at a specified value for a predetermined time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
6.0 seconds or more
DTC Type
One drive cycle, MIL on

Enable Conditions
Condition
Minimum
Maximum
Engine coolant temperature
[ECT SENSOR 1]
156 °F (69 °C)
–
Engine speed [ENGINE SPEED]
71 kPa (530 mmHg, 20.9 inHg)*
3,900 rpm
–
102 kPa (760 mmHg, 30.0 inHg)*
2,500 rpm
–
Other
No change of boost pressure upper limit
*: Barometric pressure [BARO SENSOR]
[ ]: HDS Parameter

Malfunction Threshold
The difference between the target boost pressure and actual boost pressure is 54 - 240 kPa (400 - 1,796 mmHg, 15.8 - 70.8 inHg) or more** for at least 6.0 seconds.

**: Varies with driving conditions.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes
Turbocharger wastegate control valve stuck open failure
Turbocharger bypass control valve open/close failure
Turbine damage or seizure
Exhaust pipe clogged
Air cleaner element clogged
Air tube between compressor and charge air cooler damage/leakage
Turbocharger boost sensor range/performance problem
BARO sensor range/performance problem

Confirmation Procedure
Operating Condition
1.
Start the engine. Hold the engine speed [ENGINE SPEED] at 3,000 rpm without load (in neutral) until the radiator fan comes on.
2.
Accelerate the vehicle at an engine speed [ENGINE SPEED] at 2,500 rpm or more with wide open throttle for at least 6 seconds.
When freeze data is stored, drive the vehicle under those conditions instead of Driving Pattern step 2.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.