sfairfield
Junior Member
Hello folks,
I have owned my 2018 RAM 1500 ECO diesel since May 2018; has 75,000 KMs (50K miles +/-); all service done at dealer; no issues, EGR fix done last year; not a work truck; on a recent drive thru upper NY state & into PA, thru the rolling mtns, the trans temp jumped to 130C (265F); the trans temp lite came on, but neither the engine nor oil lite did - both remained normal at 100C; outside temp was a warm day at approx 80F; not towing; after slowing down, the temp did drop & when I pulled over, the fan was running full tilt; it did cool down & I completed the run to PA w/o issue. This only happened on the way to Lancaster, & all temps were normal on the drive back (to Toronto); note: the outside temp dropped to 60F on the return drive.
My dealer scoped upon my return, & as there was no fault indicated as the engine light didn't trigger & they couldn't find anything wrong. I am perplexed; kindly, they offered to cover the diagnostic charge, & offered a full tranny service (for about $1000) - but could not cover under any warranty (still under FCA) as the engine fault did not register.
OK - so I am now perplexed; & plan another long drive, which has me worried;
I have been reading various info on the Thermal Bypass Valve, which is supposed to control the coolant into the transmission cooler.
I am confirming with the dealer if they even checked this out, or the temp sensor?
Looking for any ideas?
thx
I have owned my 2018 RAM 1500 ECO diesel since May 2018; has 75,000 KMs (50K miles +/-); all service done at dealer; no issues, EGR fix done last year; not a work truck; on a recent drive thru upper NY state & into PA, thru the rolling mtns, the trans temp jumped to 130C (265F); the trans temp lite came on, but neither the engine nor oil lite did - both remained normal at 100C; outside temp was a warm day at approx 80F; not towing; after slowing down, the temp did drop & when I pulled over, the fan was running full tilt; it did cool down & I completed the run to PA w/o issue. This only happened on the way to Lancaster, & all temps were normal on the drive back (to Toronto); note: the outside temp dropped to 60F on the return drive.
My dealer scoped upon my return, & as there was no fault indicated as the engine light didn't trigger & they couldn't find anything wrong. I am perplexed; kindly, they offered to cover the diagnostic charge, & offered a full tranny service (for about $1000) - but could not cover under any warranty (still under FCA) as the engine fault did not register.
OK - so I am now perplexed; & plan another long drive, which has me worried;
I have been reading various info on the Thermal Bypass Valve, which is supposed to control the coolant into the transmission cooler.
I am confirming with the dealer if they even checked this out, or the temp sensor?
Looking for any ideas?
thx