Po299 turbo underboost problem - 2004 Dodge Sprinter

You don't say which model vehicle but here is a general link. P0299 Turbo Supercharger Underboost

the following answer is courtsey of OBD-CODES.com OBD Codes Your OBD-II Trouble Codes Repair Site Home Trouble Codes FAQs Forums Store P0299 Turbo / Supercharger Underboost OBD-II Trouble Code Technical Description Turbocharger/Supercharger "A" Underboost Condition What does that mean? The P0299 DTC code refers to a condition where the PCM/ECM (powertrain/engine control module) has detected that the bank "A" or single turbocharger or supercharger is not providing a normal amount of boost. That could be due to a variety of reasons, which we detail below. On a normally operating turbocharged or supercharged engine the air going into the engine is pressurized and that's part of what makes so much power for an engine of it's size. If this code is set, you will likely notice reduced power output. In the case of Ford vehicles, this may apply: "The PCM checks for a minimum throttle intake pressure (TIP) PID reading during engine operation, which indicates an underboost condition. This DTC sets when the PCM detects that the actual throttle intake pressure is less than the desired throttle intake pressure by 4 psi or more for 5 seconds." Symptoms Symptoms of a P0299 DTC may include: MIL (Malfunction indicator lamp) illumination Reduced power output from engine, possibly in a limp mode Unusual sounds from the engine/turbo There would likely be no other symptoms. Potential Causes Potential causes of a P0299 turbo underboost code include: Intake (induction) air restriction or leak Failed or damaged turbocharger (sticking, binding, etc.) Faulty boost/charge pressure sensor Faulty wastegate bypass regulator valve (VW) Low fuel pressure condition (Isuzu) Sticking turbo nozzle control solenoid (Isuzu) Faulty injector control pressure (ICP) sensor (Ford) Low oil pressure (Ford) EGR system fault (Ford) Variable geometry turbocharger (VGT) actuator (Ford) VGT vanes sticking (Ford) Possible Solutions First off, you'll want to repair any other DTC codes if present prior to diagnosing this code. Start with a visual inspection. Inspect the intake air system for cracks, loose or disconnected hoses, restrictions, blockages, etc. Repair or replace as required. If the air induction system tests OK, then you'll want to focus your diagnosis efforts on the charge pressure control, diverter valve (blowoff valve), sensors, regulators, etc. Really at this point you'll want to refer to a vehicle specific detailed repair manual for specific troubleshooting steps. There are some known issues on certain makes and engines so also check out our car repair forums here and search using your keywords. For example, if you search around, you'll find that a common fix for a P0299 in VWs is to replace or repair the diverter valve or wastegate solenoid. On the GM Duramax diesel, this code may mean the turbo housing resonator has failed. If you have a Ford, you'll want to next check the wastegate regulating valve solenoid for correct operation

Read more at: http://www.obd-codes.com/p0299
Copyright OBD-Codes.com
OBD II Trouble Codes Home

P0299 Volkswagen Turbocharger Engine Underboost

Notice that 2 of the 3 causes are related to the turbo. A waste gate is the dump valve to let the air out when the engine is not consuming all the air that the turbo is creating.

Has to be at a shop that works on turbos

None of the code checking etc, without vehicle
system knowledge, is of any value to you

Throttle Body is not humming

If you can buy factory manuals for lots of money,
maybe you can work on it, when you have trouble charts to follow

Throttle Plate Angle or % is subject to constant change, so unless
your friend knows the vehicle systems, then you wouldn't be here

Many issues are simply resolved by updating the ECM on board computer, with a truck this year I wold check to see if there are any recalls.

What ,year audi and model? EPC LIGHT PO299. let me see if i can find out with out year and model.
okay, if your car has turbo then this is correct, po299 low boost.
this may be caused by a bad diverter valve on the turbo, if you remove it and look ay diaphram for any cracks or splits in rubber, if it is then replace it ,check for an update valve at dealer.
there are other thing that can cause this code but start with that. a loose hose for the turbo can cause this code or bad turbo or clogged converter, or oil sulge problem.

The exhaust pressure sensor is located at the drivers rear of engine by turbo. You have to remove the air inlet tube and charge air cooler tube to access it in vehicle. If you are also getting a 0299 code take it to a shop that has a smoke machine and fittings to check for intake air leaks. The air inlet hose between filter and turbo is a common fault point for this code anyway. Be advised that 3.0 turbo of this age could be losing all boost and that means turbo replacement or much bucks replacing gaskets.

Check all hoses to and from turbo to intake .. it is most likely a leak somewhere and the pcm is reading it as a underboost code.

code#2146 fuel injector group a supply voltage ckt (open) code# po299 turbo/supercharger (underboost) code# po483 control fan rationality check (malfunction) code# po513 immobilizer (incorrect)

Turbo/Super Charger UnderBoost .