Engine Codes
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Junior User
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Engine Codes
I tried to open the explanation of engine codes, but could not get it to open. Can anyone explain these codes to me?
PO 299 (might have been 289) - Turbo Underboost
PO 401 - EGR insufficient flow detected
PO 478 - Exhaust pressure control valve high
PO 488 - EGR throttle position control range/performance
PO 299 (might have been 289) - Turbo Underboost
PO 401 - EGR insufficient flow detected
PO 478 - Exhaust pressure control valve high
PO 488 - EGR throttle position control range/performance
Hotshot
Joined: Apr 2010
Posts: 19,071
Likes: 241
From: Saratoga Springs,UT
I tried to open the explanation of engine codes, but could not get it to open. Can anyone explain these codes to me?
PO 299 (might have been 289) - Turbo Underboost
PO 401 - EGR insufficient flow detected
PO 478 - Exhaust pressure control valve high
PO 488 - EGR throttle position control range/performance
PO 299 (might have been 289) - Turbo Underboost
PO 401 - EGR insufficient flow detected
PO 478 - Exhaust pressure control valve high
PO 488 - EGR throttle position control range/performance
so the truck runs Bad??????????? with all that Pretty shure it does run Rough
P0299 Turbocharger/Supercharger "A" Underboost Condition D* D
P0401 C* Exhaust Gas Recirculation Flow Insufficient Detected EGR Valve Position does not match desired, limits based on
engine speed / load.
EGR Valve stuck or sticking - EGR Valve Position Sensor Bias - EP
Sensor bias.engine speed / load.
EGR Valve stuck or sticking - EGR Valve Position Sensor Bias - EP
P0478 C* Exhaust Pressure Control Valve High Input EP is higher than EP desired by 260 kpa (37.7 PSI) for
greater than 30 seconds.
Faulty EP sensor, VGT control valve slow to respond, Stuck VGT
valve, faulty PCM.greater than 30 seconds.
Faulty EP sensor, VGT control valve slow to respond, Stuck VGT
P0488 Exhaust Gas Recirculation Throttle Control Circuit "A" Range/Performance D+ d d D*
Any recent work?????
What scanner did you pull these DTC with????????????
Do you have a EGR Deleate?????
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Junior User
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No recent work, it does not feel very rough when I drive it. Getting about 12.5 mpg right now (city), and just bought it a month ago. Getting the valve cover gaskets replaced and the guy at the shop read off the codes for me. Not sure what system he used, but I have not had any engone lights come on either. To my knowledge there is not an EGR delete on it.
Hotshot
Joined: Apr 2010
Posts: 19,071
Likes: 241
From: Saratoga Springs,UT
well being New truck (to you) you might not feel the Power Lose
If the truck is Stock then 12.5mpg is Down on MPG alittle IMO
Look into getting a ScanGaugeII
Im thinking the EBP sensor is Plugged or Bad but Need to check some things to verify
If the truck is Stock then 12.5mpg is Down on MPG alittle IMO
Look into getting a ScanGaugeII
Im thinking the EBP sensor is Plugged or Bad but Need to check some things to verify
Hotshot
Joined: Apr 2010
Posts: 19,071
Likes: 241
From: Saratoga Springs,UT
There was a MPG website Bismic was turning the Guys onto that gave them alittle discount IDK if the still do ikt or Not
whats the matter with the Valve covers they leak?????????
whats the matter with the Valve covers they leak?????????
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They do. Bolts were torqued correctly, was going to try to retorque to see if I could get around having to replace the gaskets.
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Hotshot
Joined: Apr 2010
Posts: 19,071
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From: Saratoga Springs,UT
So this shop its at is just Torque the Valve cover Bolts???? or are they installing New Gaskets????
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They tried to torque them first, but they were already to the specified torque. So they recommended to go ahead and change them. They are going to do the work there. They are replacing my ball joints as well to HD ones. The stock ones are shot.
Hotshot
Joined: Apr 2010
Posts: 19,071
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From: Saratoga Springs,UT
I changed my BJ to MOOG and so far so GOOD
Depending on year Might be a Good Idea to change a couple other Seals while the Valve Covers are off
Is it an 05+????? those need the updated Seals
Depending on year Might be a Good Idea to change a couple other Seals while the Valve Covers are off
Is it an 05+????? those need the updated Seals
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