2001 Honda Accord Automatic Transmission Fault Codes: P0700, P0730, P0740, P0780, P1739 - Can It Be Fixed Electrically or Does It Need a Full Transmission Overhaul?

I'm wondering if anyone has found a resolution to their transmission issues with these same codes. My son's 1998 Honda Prelude (automatic) shows P0700, P0730, P0740, and P1738 — similar patterns. It now revs excessively before shifting gears. I'm leaning toward the transmission being beyond repair, but I'd love to hear how others have resolved these issues on their vehicles. Thanks, Les

Les, I've tried reaching out to many forum members for input, and no one has provided useful information. After extensive online research, the consensus seems to be that a complete transmission overhaul is required. If anyone knows of alternative solutions or diagnostics, please share them.

Hello — start by inspecting the electrical harness connecting the engine to the transmission. Trace the wires from the engine end to the transmission connector and check for any physical damage, such as breaks or fraying. Gently move and squeeze each wire to test for loose connections or shorts. Next, verify that no fuses in the vehicle’s fuse box are blown — especially those related to the transmission control system. If the wiring appears intact, open the transmission oil pan and inspect the solenoid harness inside. Look for signs of shorting, looseness, or broken wires. This step can often reveal electrical faults that may be causing the codes.

Honda vehicles have a history of transmission-related recalls, so I recommend first contacting your local dealership to check if any relevant service updates or recall actions apply to my 2001 Accord. Additionally, shift modules in this model range are known to fail and may be the source of these codes. Have a certified technician perform component-specific tests on the transmission control module and solenoids to identify whether the issue is electrical or mechanical. Also, ensure that transmission fluid is changed every 15,000 miles — dirty fluid can contribute to erratic shifting and code generation.

My cat fuse keeps blowing, and after that, the check engine light comes on — only after the fuse fails. I suspect this could be related to P0700, as it may indicate a power supply issue affecting transmission control. Could there be a connection between blown fuses and these codes? Any insight would be helpful.

Sandra — I noticed you've posted two separate entries. This makes the discussion confusing. Please consolidate your posts into one clear topic, update the content with more specific details (such as symptoms and diagnostic steps), and clearly state the vehicle model and codes involved to improve clarity and help others find relevant information.