my 2000 honda civic d4 light blinks and my car want go over 20mph in drive 4 but if

it's the computer in the passenger floorboard that controls your transmission .... You need to replace it
 
When you Power train Control Module detects a transmission Fault
It cause the D4 indicator to flash and set a current or history fault code.
It will also default to a lower gear or LImp mode. Take it to the dealer
Get it Diagnosed.
 
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