DTC 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 | 5.0 seconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Engine coolant temperature [ ECT Sensor 1] | 155.9 deg.F (68.8 deg.C) | - | |
| Engine speed [ Engine Speed] | 62 kPa (460 mmHg, 18.1 inHg)* | 2550 RPM | - |
| 71 kPa (530 mmHg, 20.9 inHg)* | 2400 RPM | - | |
| 84 kPa (624 mmHg, 24.6 inHg)* | 2250 RPM | - | |
| 95 kPa (714 mmHg, 28.1 inHg)* | 2000 RPM | - | |
| 99 kPa (740 mmHg, 29.1 inHg)* | 1900 RPM | - | |
| Other | No change of boost pressure upper limit | ||
| *: Barometric pressure [ Baro Sensor] [ ]: HDS Parameter |
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Malfunction Threshold
The difference between the target boost pressure and actual boost pressure is 5.7 kPa (42.7 mmHg, 29.95 inHg) or more and the boost pressure is 53 - 124 kPa (400 - 933 mmHg, 15.7 - 36.7 inHg) or less* for at least 5.0 seconds.
*: Varies with driving conditions.
Possible Cause
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 intercooler damage/leakage
- Turbocharger boost sensor range/performance problem
- BARO sensor range/performance problem
Confirmation Procedure
Operating Condition
- Start the engine. Hold the engine speed [ Engine Speed] at 3000 RPM without load (in P or N) until the radiator fan comes on.
- Accelerate the vehicle at an engine speed [ Engine Speed] at 1900 RPM or more with wide open throttle for at least 5 seconds.
- 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, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.