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Error code P2821 Civic 2013

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Old May 5, 2023
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Error code P2821 Civic 2013

Hello,
I have a 2013 Honda civic, A/T. I had to swap my gearbox about a month back and ever since I get the transmission error with code P2821. I have checked all the sensors and pressure switch, connectors and battery. Yet the problem insists. I get the error whenever the car is cold and has just started running. It goes into limp mode with D flashing. If I turn off the car and switch back on, the error goes away and everything is back to normal for some time then comes back. Once the engine is hot, the error doesn't come back. Can anyone please help.
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Old May 5, 2023
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Re: Error code P2821 Civic 2013

Did you swap solenoids/sensors from the old transmission onto the new one?

Third post in this thread shows you where the solenoid is. https://www.civicforums.com/forums/3...de-issues.html
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Old May 5, 2023
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Re: Error code P2821 Civic 2013

Tried that but the problem is still there
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Old May 5, 2023
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Re: Error code P2821 Civic 2013

if a shop did the job, take it back
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Old Feb 12, 2024
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Re: Error code P2821 Civic 2013

Originally Posted by tkoonjul
Tried that but the problem is still there
Hello, have you solved the problem with the P2821 error? I had the same problem after installing the automatic transmission
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