The pressure sensors and solenoids like to get clogged with crap. They are easily accessed once the pan/filter are out of the way. I think there is another piece that needs to come off for the O/D and TCC solenoid set though, so you can access the bolt that holds the connector in place. Supposedly, you do NOT have to drop the entire valve body.

 

yup...4 bolts and the smaller piece drops right off the valve body...this is where the solenoid and sensor are...look in the DIY section..

 

I bought a 98 project truck last week (May 2020, so late to this thread). Electrical nightmare. Replaced the PDC and C134 harness with a donor truck.

long story short, P0743 code. What I found was: check shift 8 pin cable at trans top, meter out to PCM C2 connector. Now check for short to ground at each pin to chassis. If wire harness rubs frame rail or is pinched it can short and not send PCM signal from Trans Clutch solenoid,

OK now here's the kicker- if you use the wrong Relay in the PDC it can throw this code. I forget offhand which it is, but I changed the E/M-type relay to the other and it fixed it. I also dropped the pan and replaced the A/B solenoid and governor solenoid. I found the 3-4 accumulator spring was broken - not sure it will actually affect drive ability - but I read its a common failure on Mopar.

 

My 2001 dodge ram 2500 is throwing codes p 0743, p0753, p0463(fuel gage don't work), p1693 and p1765. What could be the cause, are they related, what's the fix? Details and ideas please!

 

P0743 Torque Converter Clutch Solenoid/Trans Relay Circuits
P0753 Trans 3-4 Shift Solenoid/Trans Relay Circuits
P0463 Fuel Level Sending Unit Voltage Too High
P1693 DTC Detected In Companion Module
P1765 Trans 12 Volt Supply Relay Control Circuit (42RE, 46RE, 47RE)
Start by checking the trans relay and see if you are getting power to the trans. Sender in the gas tank is probably bad giving you the 463 code.

 

Long story short I have a 96 rag cab short bed 1500 I swapped everything from a 96 2500 (12v cummins 47re suspension brakes and diff) into my truck I'm having lock up issues throwing po743 I even tryed to bandage it with a lock up switch shutters bad and will even kick out of lock up if you're really on it. I've been leaning towards low line pressure (trans had been rebuild when the previous owner had it)

 

I would be more inclined to think it was an electrical issue..... Maybe verify that your circuit is good when the problem occurs.

 

Im thinking thevsame way the olnly odd issuebis if you just drive it its fine if you load it and build some boost it'll kick out of lock up then shutter back in

 

Are you sure it's lock up and not overdrive? Since you have the code check out the possible causes...
https://obdcodelookup.com/dtc/p0743-dodge/