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Discussion Starter · #1 ·
I need some help....8 weeks ago while pulling my weekend warrior up the pass there was a loud pop and then the truck went into limp mode...took it to the dealer and they said it was a turbo not wanting to spend the ridiculous amount they wanted to fix it i took it to a local diesel shop and they replaced the turbo and the glo plugs...had it back 6 days and it did the same thing only without the trailer so I took it back and he stated the new turbo was bad full of oil so he replaced it....drove it two weeks with no issues and first trip out to the desert pulling the trailer it did the same thing truck shuts down computer says engine power reduced...this has happened 4 times total now and I got it back friday and just tested it again with my trailer attached and it shut down again for the 5th time...limped my truck and trailer to my storage and dropped it off and shut the truck off for 5 mins and when I got back in it and drove off without the trailer it was perfectly fine and back to full power...I have changed the turbo, cleaned the manifolds, changed the fuel filter and this mechanic still isnt getting it fixed so here i am asking if anyone has had this problem or has any ideas what coulds possibly be wrong so I can get it fixed for good....Thanks guys
 

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Codes will help. How much did the dealer want to replace everything? Also did you attempt to get assistance from General Motors? They probably would have split the repair bill with you. Did they use OE parts? Could also be poor workmanship. Get us what you can and lets see if we can get to the bottom of this.
 

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Discussion Starter · #6 ·
I dont remember what the code was specifically in the beginning but it was a turbo code and the dealer stated the turbo was bad and needed to be replaced so I took it to a diesel mechanic and he replaced the turbo and it was 4k the dealer wanted 5k but since the diesel shop replaced the turbo its done exactly the same thing since the first time so I am not sure it was ever the turbo. I will get the code from yesterday and post it up so you guys can see it. I was told today by a friend who's cousin is a diesel mechanic that it is probably the Fuel Pressure Releif Valve or its the Fuel Rail Pressure?
 

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Discussion Starter · #7 ·
Add on to that last post...before that intial shut down it would at times feel sluggish and not pull like it should from a dead stop but would eventually get going also the gas pedal feels different to me now but it could just be me.
 

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Discussion Starter · #8 ·
So the code we just pulled is a PO299 Turbo Charger / SuperCharger under boost condition...could that be caused by lack of fuel or lack of fuel pressure?
 

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DTC Descriptor
DTC P0299
Turbocharger Engine Underboost

Circuit/System Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharger output, engine speed, accelerator pedal input, ambient air temperature, and barometric pressure (BARO). A diaphragm within the MAP pressure sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates these changes into electrical resistance. The engine control module (ECM) supplies a regulated 5 volts on the 5-volt reference circuit and a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to intake manifold pressures, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value. Under normal operation, the lowest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the vehicle is operated at idle or when the ignition is ON while the engine is OFF. The highest manifold pressures occur when the turbocharger output is high. Manifold pressure can range from 58 kPa (8 psi) when pressures are low to more than 295 kPa (42.7 psi) when pressures are high, depending on the BARO. The MAP pressure sensor has a range of 43–365 kPa (6–53 psi). The ECM monitors the MAP sensor by comparing a calculated predicted value at a predetermined engine load and speed, to the actual sensor input.

Conditions for Running the DTC
DTCs P2564 or P2565 are not set.
The engine speed is between 800–3,000 RPM.
DTC P0299 runs continuously when the above conditions are met.
Conditions for Setting the DTC
The measured MAP pressure is more than 39 kPa below the expected range for 10 seconds.

Action Taken When the DTC Sets
DTC P0299 is a Type A DTC.
A message center or an indicator may display reduced engine power.
The ECM commands reduced engine power.
Diesel particulate filter (DPF) regeneration is inhibited.
Conditions for Clearing the DTC
DTC P0299 is a Type A DTC.

Diagnostic Aids
If the condition is intermittent. Refer to Testing for Intermittent Conditions and Poor Connections and Inducing Intermittent Fault Conditions.
A MAP sensor that is stuck at BARO, or is skewed 40 kPa lower than desired while under boost will cause this DTC to set.
If the vehicle passes the Circuit/System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records list.
Reference Information
Schematic Reference
Engine Controls Schematics

Connector End View Reference
Component Connector End Views

Description and Operation
Turbocharger System Description

Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
Control Module References for scan tool information

Circuit/System Verification
Verify that DTCs P003A, P0047, P0048, P046C, P0402, P0403, P0698, P0699, P2563, P2564 or P2565 are not set.
If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
Engine running, command the TC Vane Pos. Ctrl. Solenoid ON, while performing a snapshot of the induction data list. Perform the following actions during the snapshot: Refer to Scan Tool Snapshot Procedure.
Slowly increase the engine speed to 1,700 RPM for 5 seconds and then return the engine speed to idle.
Plot the snapshot and verify that the MAP sensor parameter increases smoothly and follows the Engine Speed parameter as the engine speed is increased, and then returned to idle.
If the MAP parameter plot slope is not a straight line with even the RPM change, replace the MAP sensor.
Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: Perform the Repair Verification after completing the Circuit/System Testing.
Verify the integrity of the air induction system, the turbocharger ducts and hoses by inspecting for the following conditions:
Any damaged components
Any loose or improperly installed components
A wet or restricted air filter
Any exhaust leaks before the turbocharger
Any exhaust restrictions after the turbocharger
Any snow or ice build-up at the air cleaner and MAF sensor
Any water, snow, ice build-up, restrictions or coking at the MAP sensor
Test the charge air system for air leaks. Refer to Charge Air Cooler Diagnosis for Full System Air Leak Test.
Test the turbocharger oil supply feed. Refer to Turbocharger Lack of Oil Supply.
Inspect the turbocharger oil supply tube for restrictions.
If a restriction is found, clean or replace the oil supply tube as necessary.
Inspect the turbocharger for debris, worn impeller and turbine blades, or damage Refer to Turbocharger Cleaning and Inspection.
If worn or damaged turbocharger blades or vanes are found, replace the turbocharger assembly.
If the induction system, charger air cooler system, the turbocharger, and the turbocharger oil supply test normal, replace the MAP sensor.
Repair Instructions
Diesel Particulate Filter (DPF) Service Regeneration
Manifold Absolute Pressure Sensor Replacement
Turbocharger Replacement
Turbocharger Oil Feed Pipe Replacement
Repair Verification
Install any components or connectors that have been removed or replaced during diagnosis.
Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
Clear the DTCs.
Turn OFF the ignition for 60 seconds.
Duplicate the Conditions for Running the DTC and use the freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
If any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. Failure to perform the turbocharger learn procedure may cause this DTC to set. Refer to Turbocharger Learn.
Perform the Diesel Particulate Filter (DPF) Service Regeneration.

That should keep you busy for a little. I did not read it tho.
 

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is that the only code you got? no excessive back pressure code?
 

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Discussion Starter · #11 ·
DTC Descriptor
DTC P0299
Turbocharger Engine Underboost

Circuit/System Description
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharger output, engine speed, accelerator pedal input, ambient air temperature, and barometric pressure (BARO). A diaphragm within the MAP pressure sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates these changes into electrical resistance. The engine control module (ECM) supplies a regulated 5 volts on the 5-volt reference circuit and a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to intake manifold pressures, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value. Under normal operation, the lowest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the vehicle is operated at idle or when the ignition is ON while the engine is OFF. The highest manifold pressures occur when the turbocharger output is high. Manifold pressure can range from 58 kPa (8 psi) when pressures are low to more than 295 kPa (42.7 psi) when pressures are high, depending on the BARO. The MAP pressure sensor has a range of 43–365 kPa (6–53 psi). The ECM monitors the MAP sensor by comparing a calculated predicted value at a predetermined engine load and speed, to the actual sensor input.

Conditions for Running the DTC
DTCs P2564 or P2565 are not set.
The engine speed is between 800–3,000 RPM.
DTC P0299 runs continuously when the above conditions are met.
Conditions for Setting the DTC
The measured MAP pressure is more than 39 kPa below the expected range for 10 seconds.

Action Taken When the DTC Sets
DTC P0299 is a Type A DTC.
A message center or an indicator may display reduced engine power.
The ECM commands reduced engine power.
Diesel particulate filter (DPF) regeneration is inhibited.
Conditions for Clearing the DTC
DTC P0299 is a Type A DTC.

Diagnostic Aids
If the condition is intermittent. Refer to Testing for Intermittent Conditions and Poor Connections and Inducing Intermittent Fault Conditions.
A MAP sensor that is stuck at BARO, or is skewed 40 kPa lower than desired while under boost will cause this DTC to set.
If the vehicle passes the Circuit/System Verification Test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records list.
Reference Information
Schematic Reference
Engine Controls Schematics

Connector End View Reference
Component Connector End Views

Description and Operation
Turbocharger System Description

Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
Control Module References for scan tool information

Circuit/System Verification
Verify that DTCs P003A, P0047, P0048, P046C, P0402, P0403, P0698, P0699, P2563, P2564 or P2565 are not set.
If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
Engine running, command the TC Vane Pos. Ctrl. Solenoid ON, while performing a snapshot of the induction data list. Perform the following actions during the snapshot: Refer to Scan Tool Snapshot Procedure.
Slowly increase the engine speed to 1,700 RPM for 5 seconds and then return the engine speed to idle.
Plot the snapshot and verify that the MAP sensor parameter increases smoothly and follows the Engine Speed parameter as the engine speed is increased, and then returned to idle.
If the MAP parameter plot slope is not a straight line with even the RPM change, replace the MAP sensor.
Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: Perform the Repair Verification after completing the Circuit/System Testing.
Verify the integrity of the air induction system, the turbocharger ducts and hoses by inspecting for the following conditions:
Any damaged components
Any loose or improperly installed components
A wet or restricted air filter
Any exhaust leaks before the turbocharger
Any exhaust restrictions after the turbocharger
Any snow or ice build-up at the air cleaner and MAF sensor
Any water, snow, ice build-up, restrictions or coking at the MAP sensor
Test the charge air system for air leaks. Refer to Charge Air Cooler Diagnosis for Full System Air Leak Test.
Test the turbocharger oil supply feed. Refer to Turbocharger Lack of Oil Supply.
Inspect the turbocharger oil supply tube for restrictions.
If a restriction is found, clean or replace the oil supply tube as necessary.
Inspect the turbocharger for debris, worn impeller and turbine blades, or damage Refer to Turbocharger Cleaning and Inspection.
If worn or damaged turbocharger blades or vanes are found, replace the turbocharger assembly.
If the induction system, charger air cooler system, the turbocharger, and the turbocharger oil supply test normal, replace the MAP sensor.
Repair Instructions
Diesel Particulate Filter (DPF) Service Regeneration
Manifold Absolute Pressure Sensor Replacement
Turbocharger Replacement
Turbocharger Oil Feed Pipe Replacement
Repair Verification
Install any components or connectors that have been removed or replaced during diagnosis.
Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
Clear the DTCs.
Turn OFF the ignition for 60 seconds.
Duplicate the Conditions for Running the DTC and use the freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.
If any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. Failure to perform the turbocharger learn procedure may cause this DTC to set. Refer to Turbocharger Learn.
Perform the Diesel Particulate Filter (DPF) Service Regeneration.

That should keep you busy for a little. I did not read it tho.
Michael thanks for all the info although I dont understand it I will pass it along to the mechanic to see if it helps. Question if the air filter was dirty and the MAF sensor was dirty would it cause this problem?
 

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from my knowledge, i don't think so...

i've had a similar event happen to me, i had underboost and excessive back pressure codes. engine limped, then shut itself off, then threw the codes it was due to DPF being plugged. generation of excessive soot and regen not able to keep-up/clear the DPF
 
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