Shift Solenoid 'B' circuit open or shorted?

TULEL1

MEMBER
1990 HONDA ACCORD
2.2L
4 CYL
2WD
AUTOMATIC
120,000 MILES

I have been getting that shift solenoid issue even after removing and replacing the part. The transmission shift when cold but when driving temperature, it loses power and shifts hard on the gear esp 3 and 4 so I was able to go to gear 1 to be able to move.

Saturday, July 19th, 2025 AT 8:38 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Circuit open means there is no connection from the shift solenoid and the automatic control unit, here is the wiring diagrams for it and a guide to help you with the testing.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know how it goes

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Saturday, July 19th, 2025 AT 9:59 AM

TULEL1

MEMBER
13 POSTS

I have replaced the solenoid and the coolant sensor but I still have the egine lights and s lights 6 check engine and 8 on the s lights

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Saturday, August 9th, 2025 AT 12:12 PM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Did you disconnect the battery to clear the codes?

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Sunday, August 10th, 2025 AT 5:45 PM

TULEL1

MEMBER
13 POSTS

I did that numerous times then changed all the coolant sensors but still have same issue. I have some spare tcu/ecu and had swapped them once so I dont know if that makes a difference

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Thursday, August 14th, 2025 AT 5:12 PM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

So we need to check the wiring from the solenoid to the ECU, use the diagrams above and this guide to help check the wiring, grn/wht and blu/yel

https://www.2carpros.com/articles/how-to-check-wiring

Please go over this guide and get back to us.

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Friday, August 15th, 2025 AT 11:48 AM