2002 Honda Odyssey d drive light blinks

Hi keving2033,

Problem is most likely electrical and does not require the trans to be replaced. Here are the diagnostic procedures.

DTC P0845: PROBLEM IN 3RD CLUTCH TRANSMISSION FLUID PRESSURE SWITCH CIRCUIT

1. Turn the ignition switch ON (II).

2. Measure the voltage between PCM connector terminals D13 and B20 or B22.
Is there battery voltage?

YES - Go to step 7.
NO - Go to step 3.

3. Turn the ignition switch OFF.

4. Disconnect PCM connector D (16P).

5. Disconnect the 3rd clutch transmission fluid pressure switch connector.

6. Check for continuity between PCM connector terminal D13 and body ground.

Is there continuity?
YES - Repair short to ground in the wire between PCM connector terminal D13 and the 3rd clutch transmission fluid pressure switch.
NO - Disconnect the 3rd clutch transmission fluid pressure switch connector, and go to step 15.

7. Raise the front of the vehicle, and make sure it is securely supported.

8. Set the parking brake, and block the rear wheels securely.

9. Start the engine, then shift to D3 position and let the wheels spin in 3rd gear for more than 5 seconds.

10. Measure the voltage between PCM connector terminals D13 and B20 or B22.
Is there about 0 V?
YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.
NO - Go to step 11.

11. Turn the ignition switch OFF.

12. Disconnect the 3rd clutch transmission fluid pressure switch connector.

13. Turn the ignition switch ON (II).

14. Measure the voltage between the 3rd clutch transmission fluid pressure switch connector
terminal and body ground.

Is there battery voltage?

YES - Go to step 15.
NO - Repair open in the wire between the 3rd transmission fluid clutch pressure switch and the PCM.

15. Measure the resistance between the 3rd clutch transmission fluid pressure switch connector
terminal and body ground.

Is the resistance 10 MÃ © and more?

YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.
NO - Replace the 3rd clutch transmission fluid pressure switch.