My wife's 2001 Honda Odyssey shows a check engine light trouble code of PO 740. A summary of service bulletin 05012004 says: Don't replace the solenoid if troubleshooting an A/T with diagnostic trouble code PO740 (lockup control system). What does the actual bulletin say to do? Thank you.

Before considering replacing the transmission, take a look at this:

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From Honda Service News:

"DTC P0740 Set? Check for Contaminated Solenoids

If you're servicing a '02 Civic with A/T, and DTC P0740 (problem in lock-up control system) is set, check for contaminated solenoids before you replace the A/T (see page 14-69 of the 2001–02 Civic S/M.) If the torque converter clutch solenoid
valve or the A/T clutch pressure solenoid valves A and B are contaminated, replace them.

Honda Transmission Manufacturing's Market Quality department analyzed 12 A/Ts that were replaced for this DTC. Here's what they found:

• 11 of the 12 A/Ts had contaminated solenoids
• After replacing the torque converter clutch solenoid valve and the A/T clutch pressure control solenoid valves A and B on all 12 A/Ts, only one had a comeback for DTC P0740."

Source: Honda Odyssey Club

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