Moisture has gotten into some electrical connectors when the heater core was replaced. These electronic transmissions have speed sensors and electrical connectors that do not like moisture in them. disconnect any connectors that may have gotten wet. Blow them out with compressed air. Good luck.
SOURCE: 2002 dodge neon code p0750
im not a trans. expert but would verify the range sensor (gear indicating sensor) is working properly and the L/R solenoid is ok. those are the 2 suspects for your problem
SOURCE: 2000 Dodge Sratus 4 speed auto transmission
Dave, The P0700 code is a generic fault code indicating the the TCM (transmission control module) has recognized a problem and the P0755 is the indicated problem. I'd recommend you check your transmission external electrical connector for water intrusion and corrosion at the terminals by disconnecting the connector. If nothing appears wrong, I'd then recommend you drop the lower transmission pan and take a look at the residue deposit that is laying on the bottom of the pan. You should only see a relativily minor amount of grayish, black clutch material residing there. Pay particular attention for a gross amount of this or any large particular material, including any metal, either filings or chunks, or any brass or aluminum. If this checks out to be fairly clean, then I'd recommend you replace that "B" solenoid (2-3 shift solenoid) and have the trans. pan and filter replaced.; I'd also highly recommend you have the trans flushed for anyother particular matter that may reside internally inside the transmission. You'll have to have the codes cleared and the transmission relearned for shift feel, at that point.
SOURCE: 2002 Dodge Caravan, Tranny would shift, DTC P0700, P0725
replace the input speed sensor to transmission and the wiring pigtail all are available at your chrysler dealer take your vehicle registration in to the parts counter so they have your vin # to get the right part and it is the front of trans by fluid linres to radiator.
SOURCE: 1997 Dodge Intrepid transmission slipping when warm
I was told to change my Transmission Control Module,located on the transmission . You can get it new for under $200 but, I was advised to get it from a junk yard it's alot cheaper and its easier. I hope this helps
SOURCE: P0700, P0750 and P0755 codes
Trouble Code: P0750
A/T Low/Reverse Solenoid Circuit Failure
Possible Causes:
L/R solenoid control circuit is open or shorted to ground
L/R solenoid control circuit is shorted to system power
L/R Solenoid is damaged or has failed
TCM or PCM has failed
Trouble Code: P0755
A/T 2/4 Solenoid Circuit Failure
Possible Causes:
2/4 Solenoid control circuit is open or shorted to ground
2/4 Solenoid control circuit is shorted to system power
2/4 Solenoid is damaged or has failed
TCM or PCM has failed
Trouble Code: P0700
Automatic Transmission Control System Malfunction
Possible Causes:
The presence of this code means the TCM detected a problem
TCM related Sensor has solenoid is damaged or has failed
This code is for information only - check for other TCM codes
TCM or PCM has failed
http://engine-codes.com/p1782_dodge.htmlForum CodePossible causes- Low transmission fluid level http://engine-codes.com/p0755_dodge.htmlForum CodePossible causes- Low transmission fluid level http://engine-codes.com/p0700_dodge.htmlForum CodePossible causes- Shorted or open circuit within transmission control module (TCM) 406 views
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