Honda TSB: Torque converter O-ring update

A/T DTC P0740, P0741

Repair Tips:

Another Look APPLIES TO: All Models

  • If there is no S/B posted on ISIS for the vehicle you’re working on, go to the DTC P0740 or P0741 troubleshooting procedure in the Automatic Transmission section of the appropriate S/M or under DTC Troubleshooting in ISIS. If the procedure recommends replacing the A/T, make sure you have a reman A/T on hand. Remove the original A/T, and look at the condition of the torque converter O-ring. Then follow these tips to ensure a lasting repair.
  • Missing or cut O-ring . If the O- ring is missing or cut, the ATF can leak internally, causing DTC P0740 or P0741 to set. Replace the O-ring, and reuse the original A/T. Make sure the problem has been fixed by connecting the HDS and test-driving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds). If the DTC comes back, install the reman A/T. If the DTC doesn’t come back, return the reman A/T to the reman center.
  • Flattened or deformed O-ring . If the O-ring is flattened or deformed, replace the A/T. The O-ring can get damaged if the ATF pump seizes up and overheats. Make sure the problem has been fixed by connecting the HDS and test-driving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds).
  • O-ring is OK . If the O-ring is round and in good condition, the most likely cause for DTC P0740 or P0741 to set is the A/T, the torque converter, or both. Install the reman A/T. Make sure the problem has been fixed by connecting the HDS and test-driving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for 25 seconds ). Before you install the reman A/T, make sure the O-ring on the torque converter is properly installed.

S/B

Model Repair
‘96-’97 Accord L4 98-040 Replace PCM or A/T
‘98 Odyssey 98-053 Replace PCM or torque converter
‘98-’99 Prelude 00-033 Replace TCM, and flush A/T
‘01 Civic 01-049 Replace torque converter

SERVICE TIP: If you’re doing a repair for DTC P0740 or P0741 (lock-up control system) on any Honda models with A/T, except Passport, refer to this table first.

– Found  in September 2008 Newsletter