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Unread 04-18-2012, 06:51 AM   #1
billyrcurry
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Help 3.0 CRD P0299 Code

We have a 2007 Jeep Grand Cherokee 3.0 CRD. The Jeep is throwing a P0299 turbo underboost code. If you let the engine get cold it will run fine until the engine gets to operating tempature then the red electronic throttle control light comes on starts flashing. The jeep then goes into limp mode and throws a P0299. Any ideas. It has been at the Jeep dealer for 2 weeks.

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Unread 04-18-2012, 01:50 PM   #2
JeepCares
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If the dealer can't fix it, they can contact the STAR Center for technical help. It's a Chrysler Group department dedicated to helping dealers.
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Unread 04-25-2012, 09:58 AM   #3
gun-driver
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Did you try changing the fuel filter. This happened to my wifes and it ended up being the fuel filter.
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Unread 04-27-2012, 09:32 AM   #4
tnadanzig
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Any update on this P0299 code. Seems like its a blockage or leak in the air charge system. Or your boost pressure servo motor needs to be replace.
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Unread 05-02-2012, 08:30 PM   #5
billyrcurry
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P0299 Code update

I have checked for charge air leaks / blockages and connot find anything. However when it does go into limp mode the linkage on the servo motor is not working. I think the motor is getting hot and quitting. I cannot find this motor anywhere.
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Unread 05-03-2012, 05:17 PM   #6
tnadanzig
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The boost pressure servo motor is the VGT actuator. The turbocharger boost pressure servomotor is bolted to the side of the turbocharger housing and is responsible for controlling turbocharger boost pressure. It controls the boost pressure by varying the position of the guide vanes. The servomotor operates in response to a PWM signal from the ECM.
This is the cause of Code P0299.
• The Boost Pressure Sensor indicates actual turbocharger boost is less than the ECM setpoint for engine boost.
You could also have a bad boost pressure sensor. The boost pressure sensor is mounted in the charge air cross over air tube, just past the air control valve.
Are you getting other codes? If your swirl motor was not operating correctly you would get a code for that. I am not familiar enough with the limp mode settings to know what all gets effected.
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Unread 05-04-2012, 05:58 PM   #7
Chirpz
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Well, one thing is nice. Even in limp mode, the CRD has more power than some cars in their regular mode.
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Unread 03-04-2013, 09:16 PM   #8
brew1
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I'm curious to hear what the outcome was for this fault code. I just had my GC CRD towed to the dealership after the serpentine belt shredded while I was several miles from home.

I had them check the pulleys, water pump and alternator. Also had them service the transmission since it just turned 100,00 miles, new transmission filters, flush and fill.

When we picked it up this evening, the CEL came on a couple miles from the dealership and the engine went into limp mode. We drove it a couple more miles home.

I pulled the code: P0299 Boost Pressure Regulation Control Range Not Reached with the following information from my Ross Tech Unit:

PID02 DTC that caused freeze frame data storage: P0299
PID04 Calculated load value: 89%
PID05 Engine coolant temperature 87C
PID11 Intake Manifold Absolute Pressure: 153 kPa abs
PID12 Engine RPM: 2333min
PID13 Vehicle Speed:104 km/h
PID15 Intake air temperature: 32C
PID16 Mass Air Flow: 110.83 g/s

The engine produces a pronounced hissing sound when increasing rpm. Possible turbo hose leak?

Just curious if anyone else has run into this code with their GC CRD and what the problem was.

Thanks~Mark
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Unread 03-04-2013, 10:18 PM   #9
BigBlue24
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Sounds like a boost leak to me!!! (Hissing noise when on the throttle increasing rpm = building boost)

On my diesel pickups, I use a tapped plumbing cap with valve stem and a rubber or silicone boot clamped to the cap and the turbo inlet in place of the air intake hose. I then add pressure using an air compressor and start chasing leaks. Big ones will be obvious, small ones might take some soapy water to discover.
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Unread 03-04-2013, 11:28 PM   #10
BurmaJack
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Quote:
Originally Posted by Chirpz View Post
Well, one thing is nice. Even in limp mode, the CRD has more power than some cars in their regular mode.
LOL I hope I never have to discover that!
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Unread 03-05-2013, 05:28 AM   #11
billyrcurry
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Problem Fixed

It was the acuator on the turbo. The black box. I found a company overseas that can repair them. You cannot buy this piece from Jeep. You must buy a complete turbo which is $4500.00!!!!! I repaired mine for $200.00
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Unread 03-05-2013, 07:50 AM   #12
segona
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Quote:
Originally Posted by billyrcurry
It was the acuator on the turbo. The black box. I found a company overseas that can repair them. You cannot buy this piece from Jeep. You must buy a complete turbo which is $4500.00!!!!! I repaired mine for $200.00
Hi
Would you mind asking which company you got fixed , please ?
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Unread 03-05-2013, 07:57 AM   #13
BAH101
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Quote:
Originally Posted by brew1
I'm curious to hear what the outcome was for this fault code. I just had my GC CRD towed to the dealership after the serpentine belt shredded while I was several miles from home.

I had them check the pulleys, water pump and alternator. Also had them service the transmission since it just turned 100,00 miles, new transmission filters, flush and fill.

When we picked it up this evening, the CEL came on a couple miles from the dealership and the engine went into limp mode. We drove it a couple more miles home.

I pulled the code: P0299 Boost Pressure Regulation Control Range Not Reached with the following information from my Ross Tech Unit:

PID02 DTC that caused freeze frame data storage: P0299
PID04 Calculated load value: 89%
PID05 Engine coolant temperature 87C
PID11 Intake Manifold Absolute Pressure: 153 kPa abs
PID12 Engine RPM: 2333min
PID13 Vehicle Speed:104 km/h
PID15 Intake air temperature: 32C
PID16 Mass Air Flow: 110.83 g/s

The engine produces a pronounced hissing sound when increasing rpm. Possible turbo hose leak?

Just curious if anyone else has run into this code with their GC CRD and what the problem was.

Thanks~Mark
Check the output hose from the turbo resonator. It is a PITA to re-install once removed. The dealer might have removed the resonator to access the serpentine belt. After the first time changing the belt, I only disconnect the top of the resonator and let it drop down and I work around it.
I had the hose blow off the very first time I had the resonator out.
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Unread 03-05-2013, 07:28 PM   #14
fishinbama
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I had to remove the battery to get my resonator secure. Would love to know about this company Billy, any of us could have this problem down the road.
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Unread 03-06-2013, 04:56 PM   #15
brew1
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Turbo Boost Pressure Servo Motor

I heard back from the dealership today.

The service tech is pointing to the boost pressure servo motor (black box), same issue that Billy had. The tech did not find any hose leaks or disconnected parts. I have yet to speak with the tech to determine how he diagnosed the servo motor failure?

Am I to understand that when revving the engine sufficiently, one should see the boost pressure servo motor linkage move? Inactivity of said linkage is the diagnosis for boost pressure servo motor (black box) failure?

There was some mention of a possible boost pressure sensor by tnadanzig earlier in this thread. Any thoughts on how to diagnosis if the boost pressure sensor was failing?

Billy or anyone else willing to share their source for a new boost pressure servo motor (black box)? I'd much prefer spending $200 vs. $4,000.

Thanks~Mark
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