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brownjeff, ASE Certified Technician
Category: Dodge
Satisfied Customers: 13886
Experience:  17 years experience, ASE certified, dealership certified, Service Manager for 15 years,
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I have a 2005 Dodge Ram 2500 with Cummins 5.9. It has a trouble

Resolved Question:

I have a 2005 Dodge Ram 2500 with Cummins 5.9. It has a trouble code P 0299. Low boost. The truck suddenly lost power and appears to have little or no boost.
Submitted: 7 years ago.
Category: Dodge
Expert:  brownjeff replied 7 years ago.

It can be as simple as a restriction in the air intake (dirty filter) or a leak in the air intake to as severe as a turbo. I will attach a flow chart along with possible causes to help you diagnosis the problem. For some of the test there are special tools needed, but you can do some with out the tools and maybe find the problem with out them.


If you still need help just reply, if not click ACCEPT when we are done.







  • Other DTC's
  • Intake air system restriction
  • Turbo charger damaged
  • Intake air system leak
  • Boost pressure sensor
  • Boost pressure sensor
  • Turbocharger
  • Intermittent condition

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

Turn the ignition on.
With the scan tool, read the Engine DTC's.

Q: Do you have other DTC's?

YES: Repair other boost related DTC's first

Inspect the air filter and intake air system for signs of restriction.
NO: Go To 2


Q: Were any restrictions found?

YES: Replace the Air Filter or repair the Intake air system for restriction.


NO: Go To 3

Disconnect the air cleaner connection to the turbo charger.
Visually inspect the turbo charger blades and turbo housing for signs of damage.

Q: Was any damaged found?

YES: Replace The Turbo charger.


NO: Go To 4

Using Miller Special tool # XXXXX pressurize the intake air system and inspect for leakage.

Q: Were any leaks detected?

YES: Repair leaking intake air system.


NO: Go To 5

Using the scan tool, compare the boost pressure sensor reading with the ambient air pressure sensor with the ignition turned on.

Q: Are the boost pressure and ambient air pressure sensors within 6 in Hg of each other?

YES: Go To 6
NO: Replace the Boost pressure sensor.


Turn the ignition off.
Install Miller special tool #9022.
Ignition on, engine not running.
Use the scan tool and compare boost pressure reading to the regulated air pressure for tool #9022.

NOTE: The reading on the boost pressure sensor may be slightly lower than the regulated pressure.

Q: Does the boost pressure sensor reading increase with the regulated air pressure?

YES: Go To 7
NO: Replace the Boost Pressure sensor.

Disconnect the exhaust outlet connection.
Visually inspect the Wastegate flap in the turbocharger turbine housing

Q: Is the Wastegate seized in the open position?

YES: Replace the Turbocharger.


NO: Test Complete.






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