Re: 2003 ram diesel auto trans in limp mode, cant find problem
[Re: Dave Hall]
#2236319
01/17/17 10:09 PM
01/17/17 10:09 PM
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Joined: Jun 2006
Posts: 916 MB,CAN
PC-CHARGER
super stock
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super stock
Joined: Jun 2006
Posts: 916
MB,CAN
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Sensors can fail but may not set a code because they are still within a range the computer believes is a valid reading. For example, a temperature sensor that normally reads -40 to +300 degrees fails but still outputs a reading of -40. The computer interprets this as a valid reading and prevents the transmission from shifting because it is too cold even though the ambient temperature may be +70. Same with a TPS that is giving a reading of say 30% throttle all the time. The computer simply believes you are cruising and doesn't set a code even though the TPS reading never changes.
Last edited by PC-CHARGER; 01/17/17 10:12 PM.
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Re: 2003 ram diesel auto trans in limp mode, cant find problem
[Re: TONY_DAGOSTINO]
#2236376
01/17/17 11:10 PM
01/17/17 11:10 PM
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Joined: Dec 2010
Posts: 1,035 Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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Sounds like there is not trans relay output voltage to the trans. Check to see if pin one of the black 8 way connector on the drivers side of the trans has 12V. Unplug it and check with the engine running. It's usually light blue wire if I remember correctly. If you don't have power check for blown fuse in the PDC, a bad trans control relay, bad wire between IPM and trans controller, or bad trans relay "control" wire between PCM and IPM. The IPM itself could also be faulty. If available, a scan tool would be helpful to actuate the relay. So you can check these aforementioned parts of the trans control system.
Last edited by 71yelladustr; 01/18/17 12:14 AM.
392 gen III hemi on E-85 727 trans Dana 60 10.02@134
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