P1781 is manufacturer control transmission, p0731 is gear 1 ratio incorrect, p1784 is manufacturer control transmission, p0700 is trans, control system malfunction. all of these codes refer to tranny.This code normally points to a faulty transmission control module, but this is an expensive part and you should have an experienced Dodge technician diagnose the problem first. or a transmission specialist. the other codes are probably associated with the p0700 code. have a good day !
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My code list states as follows; p1781- o d pressure switch sense circuit p0731- gear ratio error in first p1784-l-r pressure switch sense circuit p-0700-internal t c m (trans control module) i would start with the control module first hope this was helpful
This may not be a solution but relevant. After changing trans fluid and filter ran into P0700, P0750 and turned out to be bad speed input sensor. Fixed and back to shifting normally, after replacing TCM, solenoid pack and speed output sensor. Was fine for a couple days now. Fluid was a tad low so thought I would top it off with some Lucas Transmission Additive (about a pint added), BIG mistake. Immediately, problems occurred. Got codes P0734,P1781, P1782, P1775, P0755 and of course P0700 after driving a mile or two and turned around and limped home. Drained fresh mixture of now **** transmission fluid and replaced with full synthetic ATF-4 and a new filter (again). Guess what, now back to normal. Won't use that **** again!
SOURCE: WHAT DOES THESE OBD CODES
Hi.
All the codes mean that there is a problem with the automatic transmission. I will start from the more general codes.
P0700 : this is the most generic code. It is telling you that an additional trouble code is stored in the automatic transmission dedicated electronic module, called TCM. The TCM can be scanned at any authorized garage using a Tech 2 diagnostic tool.
POSSIBLE CAUSES:
Any automatic transmission malfunction.
P0731 : Wrong gear ratio in first.
The Transmission Gear Ratio is monitored continuously while the Transmission is in gear. If the ratio of the input RPM to the output RPM does not match the current Gear Ratio you get this code.
Low transmission fluid.
Automatic transmission malfunction.
P1781-OD PRESSURE SWITCH SENSE CIRCUIT
One of the Pressure Switches in transmission is closed at the wrong time in a given gear.
POSSIBLE CAUSES:
TRANSMISSION RELAY DTCS PRESENT
INTERMITTENT WIRING AND CONNECTORS
TRANSMISSION RELAY OUTPUT CIRCUIT OPEN
O/D PRESSURE SWITCH SENSE CIRCUIT OPEN
O/D PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
O/D PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
O/D PRESSURE SWITCH INOPERATIVE
TCM - O/D PRESSURE SWITCH
P1784-LR PRESSURE SWITCH SENSE CIRCUIT.
Possible causes: see P1781.
P1781 and P1784 are the most revelatory codes, they say that there is a problem with transmission fluid circulation. Replace transmission fluid. Low fluid level can be the cause of many Transmission problems. If the fluid level is low locate and repair the leak then check and adjust the fluid level per Service Information.
If replacing fluid does not help, have the TCM codes scanned, and test the transmission relay.
Here procedure for the relay testing:
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector
Remove the Transmission Control Relay from the IPM.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Transmission Control Relay Output circuit and
the Fused B+ circuit in the IPM.
Using a 12-volt test light connected to ground, check the Transmission Control Relay
Output circuit in the Solenoid/Pressure Switch Assembly harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes ? Go To 7
No ? Repair the Transmission Control Relay Output circuit for an open
or high resistance. If the fuse is open make sure to check for a
short to ground.
7) Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the L/R Pressure Switch Sense circuit from the TCM
harness connector to the Transmission Solenoid/Pressure Switch Assembly harness
connector.
Is the resistance above 5.0 ohms?
Yes ? Repair the L/R Pressure Switch Sense circuit for an open.
Perform 41TE TRANSMISSION VERIFICATION TEST
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