DTC Troubleshooting: P0299
DTC P0299: Turbocharger Underboost Problem
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0299 Turbocharger Underboost Problem
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on.

?5.
Test-drive the vehicle under the same conditions with the on-board snapshot of this DTC is recorded.
Signal
Current conditions
Values
Unit
VEHICLE SPEED
    
ECT SENSOR 1
    
MAP SENSOR (HI RES)
    
TC BOOST PRESSURE
    
ENGINE SPEED
    

?6.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0299 Turbocharger Underboost Problem
    

Is DTC P0299 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the turbocharger and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
Air cleaner check:

Air cleaner check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Inspect the air cleaner element.

Is the air cleaner element clogged?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
Check for leak or damage components:

Check for leak or damage components
?1.
Check for leak or damage at these parts between the turbocharger and the throttle body.
Turbocharger outlet pipe
Intercooler inlet hose
Intercooler inlet pipe
Intercooler
Intercooler outlet pipe
Intercooler outlet hose
Throttle body inlet pipe
Throttle body connector tube

Are the parts OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Repair or replace the damaged parts.?
4.
Check for EVAP canister purge line:

Check for EVAP canister purge line
?1.
Visually inspect each of the components below for disconnected hoses, cracks, or damage:
Non-return valve A
Non-return valve B
EVAP canister purge valve (C)
Hose (D)

Are any components disconnected or damaged?

     
YES
     
     
     
Repair the connection or replace damaged part(s).?
     
NO
     
     
     
Go to step 5.
5.
Check for non-return valves:

Check for non-return valves
?1.
Inspect non-return valve A and B.

Are the valves OK?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
6.
Turbocharger bypass control solenoid valve operation check:

Turbocharger bypass control solenoid valve operation check
?1.
Turn the vehicle to the ON mode.

?2.
Select the TC BYPASS CONTROL SOL.V TEST in the INSPECTION MENU with the HDS.

  

Is there a clicking noise from the turbocharger bypass solenoid valve?

     
YES
     
     
     
Go to step 7.
     
NO
     
     
     
7.
Check for turbocharger bypass control valve control line:

Check for turbocharger bypass control valve control line
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Visually inspect each of the components below for disconnected hoses, blockage, or damage:
Hose (A) between the turbocharger bypass control solenoid valve and the intake manifold
Hose (B) between the turbocharger bypass control solenoid valve and the turbocharger bypass control valve
Hose (C) between turbocharger bypass control solenoid valve and the turbocharger



Are any components disconnected, blockage, or damaged?

     
YES
     
     
     
Repair the connection or replace damaged part(s).?
     
NO
     
     
     
Go to step 8.
8.
Turbocharger bypass control solenoid valve check:

Turbocharger bypass control solenoid valve check
?1.
Inspect the turbocharger bypass control solenoid valve.

Is the solenoid valve OK?

     
YES
     
     
     
Go to step 9.
     
NO
     
     
     
9.
Turbocharger bypass control valve check:

Turbocharger bypass control valve check
?1.
Inspect the turbocharger bypass control valve.

Is the valve OK?

     
YES
     
     
     
Go to step 10.
     
NO
     
     
     
10.
Turbocharger wastegate control actuator check:

Turbocharger wastegate control actuator check:
?1.
Select the Electric Waste Gate in the INSPECTION MENU with the HDS.

  

?2.
Visually inspect the operation of the turbocharger wastegate control actuator.

Does the turbocharger wastegate control actuator operate?

     
YES
     
     
     
Check for clogging or damaged in these parts.?
?
Turbocharger
?
Catalytic converter
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0299 goes away and the PCM was substituted, replace the original PCM.?
     
NO