Re: MY 6.4 hemi W/545 Trans, goes into limp mode at fwy speed
[Re: 70blackfish]
#1990456
01/14/16 04:30 AM
01/14/16 04:30 AM
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Joined: May 2007
Posts: 553
Sac, CA, USA
ntstlgl1970
mopar
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mopar
Joined: May 2007
Posts: 553
Sac, CA, USA
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Do you have one of those oil catch cans in the pcv hose? If so, look for an air leak in a hose, clamp or fitting. Had this issue on my srt8 challenger. It's scary when it happens on the freeway. Another Thing to check would be the carbon canister purge line from the intake, make sure there are no leaks there either. Can you post the freeze frame data?
Last edited by ntstlgl1970; 01/14/16 04:43 AM.
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Re: MY 6.4 hemi W/545 Trans, goes into limp mode at fwy speed
[Re: 70blackfish]
#1991595
01/15/16 11:19 PM
01/15/16 11:19 PM
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Joined: May 2007
Posts: 553
Sac, CA, USA
ntstlgl1970
mopar
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mopar
Joined: May 2007
Posts: 553
Sac, CA, USA
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code po443 poo38 poo58. any of these make engine go into limp mode, engines goes from 2100 rpm to idle, gas pedal does nothing, pull to side of the road cycle engine. gas pedal works. but does it again once i hit freeway speed in less than 5 min. P0038-O2-SENSOR 1/2 HEATER CIRCUIT HIGH P0058-O2-SENSOR 2/2 HEATER CIRCUIT HIGH P0443-EVAP PURGE SOLENOID CIRCUIT This is the one thing that really sucks about drive by wire. The computer is "seeing" a different amount of air (via the sensors) than what it expects for a given amount of throttle opening, so it says FU and goes into limp mode. I think the only way to figure this out is with the freeze frame data. Even the cheaper scan tools will give you freeze frame data now. Physically, I would look for vacuum leaks and chaffed wiring for the post cat O2 sensors (if you have them). I can get you the wiring and flowcharts if you want. chart attached is for the p0038 code
Last edited by ntstlgl1970; 01/15/16 11:24 PM.
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Re: MY 6.4 hemi W/545 Trans, goes into limp mode at fwy speed
[Re: 70blackfish]
#1992402
01/17/16 03:18 AM
01/17/16 03:18 AM
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Joined: May 2007
Posts: 553
Sac, CA, USA
ntstlgl1970
mopar
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mopar
Joined: May 2007
Posts: 553
Sac, CA, USA
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yes dead pedal limp mode. it has only two o2 sensors and no cat converters.. If whoever supplied the harness and tune disabled the secondary o2 sensors, then you need to go after the evap code first. Again, the code could be a result of a wiring issue or a vacuum leak. Do you have a carbon canister and a purge solenoid or was that removed from the harness too?
Last edited by ntstlgl1970; 01/17/16 03:23 AM.
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Re: MY 6.4 hemi W/545 Trans, goes into limp mode at fwy speed
[Re: ntstlgl1970]
#2011075
02/13/16 02:18 PM
02/13/16 02:18 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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code po443 poo38 poo58. any of these make engine go into limp mode, engines goes from 2100 rpm to idle, gas pedal does nothing, pull to side of the road cycle engine. gas pedal works. but does it again once i hit freeway speed in less than 5 min. P0038-O2-SENSOR 1/2 HEATER CIRCUIT HIGH P0058-O2-SENSOR 2/2 HEATER CIRCUIT HIGH P0443-EVAP PURGE SOLENOID CIRCUIT This is the one thing that really sucks about drive by wire. The computer is "seeing" a different amount of air (via the sensors) than what it expects for a given amount of throttle opening, so it says FU and goes into limp mode. I think the only way to figure this out is with the freeze frame data. Even the cheaper scan tools will give you freeze frame data now. Physically, I would look for vacuum leaks and chaffed wiring for the post cat O2 sensors (if you have them). I can get you the wiring and flowcharts if you want. chart attached is for the p0038 code A vacum leak will not cause any of these codes as these are all electrical codes. First thing I do when I have a few codes that are electrical related is look at the wire diaghram and see if any of the circuits are related and tied in to each other anywhere including grounds. Ron
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