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| Underboost - intermittant code http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=64870 |
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| Author: | rictek [ Wed Jan 25, 2012 11:16 am ] |
| Post subject: | Underboost - intermittant code |
I am getting the generic code P0299 Turbo Underboost along with P1250 Vacuum Reservoir Control Circuit Open. The second code comes on first. Sometimes it is Vacuum Reservoir Control Circuit High. The boost comes and goes during the drive. It only seems low on boost right off idle. Higher RPMS are fine. If I clear the codes, it runs fine for a while, throws the code, then it may run normal for a while. It can't be a hole in the inter cooler hose because sometimes I have full boost as normal. The Shop Manual just says to check for a short. Does anyone have any experience with this? What is vacuum reservoir and why would that mess with the boost? |
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| Author: | papaindigo [ Wed Jan 25, 2012 11:22 am ] |
| Post subject: | Re: Underboost - intermittant code |
Try bypassing the boost pressure solenoid although I would not rule out hoses, even with intermittant boost, unless they have been inspected off the vehicle and after removal of the mesh covering especially if they are 1st gen OEM. If you want pictures for the bypass shoot me an email. |
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| Author: | msilbernagel [ Wed Jan 25, 2012 4:22 pm ] |
| Post subject: | Re: Underboost - intermittant code |
Sounds pretty close to this diagnosis: http://townhall-talk.edmunds.com/direct ... f0f784a/48 Re: Error code P1250 and P0299 [jeepon] by dasboot72 Feb 15, 2010 (8:39 pm) Replying to: jeepon (Feb 15, 2010 2:37 pm) Hi, I have been a Chrysler/Dodge/Jeep mechanic for 15 years. I am also the only diesel mechanic at my dealer. The P0299 Boost pressure sensor positive deviation, is a common code in the Liberty diesel. TSB # 25-001-05 Rev. A describes this condition. Essentially your PCM needs to be flashed (Reprogrammed) and the EGR valve replaced. The P1250 Vacuum Reservoir Solonoid open circuit DTC is also a code I've seen in the past. You most likely need a new Vac Res solonoid. It is located on top of the Vac Reservoir which is on the passenger side of the engine compartment. It is a kind of stepped cylinder with 2 vacuum lines going to it and an electrical plug. Hope this helps. ? Mark |
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| Author: | rictek [ Sun Jan 29, 2012 1:11 pm ] |
| Post subject: | Re: Underboost - intermittant code |
Yep- bad solenoid. Thanks guys! The bypass test worked. |
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