That is it, no other failures or DTC. on car.?
no driving symptoms?
as always, check all fuses!
p1659 = the electronic throttle control system (ETCS) control relay malfunction
aka a relay used in the drive by wire system
"When the voltage from the ETCS control relay is not detected for a set
time after the ETCS control relay is turned on when the ignition is
turned to ON (ll), or when voltage is not applied for a set time when
the throttle actuator (thing that moves the butterfly valve inside
throttle body based on gas pedal) is operating, a malfunction in the
ETCS control relay power switch is detected and a DTC is stored."
I wouldn't worry about it if the light went away
if it comes back its most likely a failing relay
civic lx 2007 p1659 ,they told me to replace the ecu because no ground coming from the ecu to the relay,need help plz
might be,.. only testing fully this circuit, can prove what is wrong.. i the ECU does not activate a good relay the ecu is bad. I rare thing. to happen. id not attempt to fix this car with out the FSM. and doing each step it states un this DTC error page. if they did, then they are correct.
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