Johann
Red Skull Member
Had P0750 pop up while on a trip. It tossed the transmission into "limp mode" which was fun. Kept the speed down and watched the temps the whole time home.
Not finding a whole lot on Ram centric forums but they are mostly Bolt On people and "take it to the dealer" is the answer. I'll take it to a local trans shop 5 min way for diagnostics before I go that far!
Narrowed down to:
L/R SOLENOID CONTROL CIRCUIT OPEN
L/R SOLENOID CONTROL CIRCUIT SHORT TO GROUND
L/R SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE
TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY
POWERTRAIN CONTROL MODULE
From here- https://ricksfreeautorepairadvice.com/dodge-ram-doesnt-shift-p0750/ but the PCM he gives diagnostic info on has 4 connectors on it and mine has two so I have not been able to figure out which pins to check resistance on.
I have pulled the connectors off the PCM and the Trans. Both were clean. Trans one had the slide lock loose and I hoped that the energetic car wash I had before the trip might have soaked one but they were dry. Would have been appropriate since I broke my usual rule of never wash the truck!
I have not yet checked continuity for the same reason above. Not sure what pins go where- both ends are different shape. I can chase it down by color but it it probably the least likely culprit. Harness visually looks good.
The other two usual suspects are an internal fault in the PCM or bad Solenoid in the bank above the valve body. I've done both of these jobs on other trucks so I can do it on this one provided I can figure out which one has failed. Rather not do both as at least one thread on Ram Forumz ended up doing... Also much rather swap in a referbed PCM than crawl under and crack the trans open on a creeper too!
This is making me miss my manual trans...
This is for a Ram 1500 5.7 Bighorn. 4X4 65RFE 6 spd trans.
TLDR: Anyone been through this one before? Anything to look out for?
Not finding a whole lot on Ram centric forums but they are mostly Bolt On people and "take it to the dealer" is the answer. I'll take it to a local trans shop 5 min way for diagnostics before I go that far!
Narrowed down to:
L/R SOLENOID CONTROL CIRCUIT OPEN
L/R SOLENOID CONTROL CIRCUIT SHORT TO GROUND
L/R SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE
TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY
POWERTRAIN CONTROL MODULE
From here- https://ricksfreeautorepairadvice.com/dodge-ram-doesnt-shift-p0750/ but the PCM he gives diagnostic info on has 4 connectors on it and mine has two so I have not been able to figure out which pins to check resistance on.
I have pulled the connectors off the PCM and the Trans. Both were clean. Trans one had the slide lock loose and I hoped that the energetic car wash I had before the trip might have soaked one but they were dry. Would have been appropriate since I broke my usual rule of never wash the truck!
I have not yet checked continuity for the same reason above. Not sure what pins go where- both ends are different shape. I can chase it down by color but it it probably the least likely culprit. Harness visually looks good.
The other two usual suspects are an internal fault in the PCM or bad Solenoid in the bank above the valve body. I've done both of these jobs on other trucks so I can do it on this one provided I can figure out which one has failed. Rather not do both as at least one thread on Ram Forumz ended up doing... Also much rather swap in a referbed PCM than crawl under and crack the trans open on a creeper too!
This is making me miss my manual trans...
This is for a Ram 1500 5.7 Bighorn. 4X4 65RFE 6 spd trans.
TLDR: Anyone been through this one before? Anything to look out for?