Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Automatic Transmission To Engine Control Module Signal ‘B’ Input High is the generic description for the P1687 Acura code, but the manufacturer may have a different description for your model and year vehicle. Currently, we have no further information
about the P1687 Acura OBDII code.