Quote:
Originally Posted by blackmega3500
Literally exact same issue my comp68 has.
Likely selonoid pack! Check all electrical including battery supply and alternator. Also when you pull the oring check the C2/C4 input sealing inserts and look for washing out which obviously is line pressure leak.
Anytime the RPM sees a glitch or drop in volts it wants to clear out the learned CVIs, eventually learning itself down to 0..... mine was at 8 last time I looked.
Also see if you can pull TCM codes with an H&S product, or high end scan tool.
My codes when stuck in 4th were
P0714(trans temp sensor signal)
P0713(trans temp sensor intermittent)
P0871 (pressure switch rationality)
All 3 being linked to the selonoid which the temp sensor is in and the moment that code is thrown it attempts to restart a learn.
These packs are known for being complete $HIT. According to Suncoast, theyve had quite a few brand new oem units delivered from supplier DOA. Even the guy that goes on all the Cummins based forums for 6.7s (Transengineer) who was apart of the design team and still with FCA says the selonoid are such crap they're TSB step one in most 68rfe issues.
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Kevin, text me back brother..