2002 Dodge Caravan Transmission Issues: P0724, P0733, and P1790 Error Codes - Need Expert Advice on Repair
My 2002 Dodge Caravan experienced transmission problems after a torque converter replacement in October. The repair initially resolved the issue of not shifting into Park, but only for about two weeks. Subsequently, the vehicle entered limp mode and would not shift out of second gear. A mechanic diagnosed error codes P0724, P0733, and P1790. He recommended replacing the entire transmission, despite having already spent $1,300 on previous repairs. I believe this is excessive and suspect a more targeted repair is needed. He installed a new Transmission Control Module (TCM) from a junkyard for $400—however, I refused to pay for it and requested its return, which he complied with. I am now concerned about the root cause. The original issue was complete loss of transmission fluid without visible leaks, followed by inability to shift into any gear. After the initial repair, the vehicle failed to enter Park. Now, it is stuck in limp mode. I have spent over $600 on rental cars and urgently need my van back. The mechanic refuses to install new input and output speed sensors, which are critical for diagnosing these codes. I am seeking advice on what steps to take next—especially whether a full transmission replacement is truly necessary or if sensor replacements or other diagnostics could resolve the issue.
Please confirm the presence of P0724. While this may not be directly related, it's worth noting that P0734 is often associated with similar transmission issues. A thorough diagnosis should include checking transmission fluid levels and gear ratio errors. The initial step for P1790 is always a fluid inspection—ensure the transmission has proper fluid and no contamination.