non start yaris automatic - Toyota Yaris Forums

Marko116 · 07-19-2023, 01:29 PM

hello everyone, need some help with my wifes car, today it would not start,
turn over the key and nothing, checked battery and i got 12 volts so its not that.
check the codes and only found one code which was a u0100 code which is lost communcation with engine ecu. has anyone had this before???
i left the car overnight and try again but still will not start or turn over with the key, its a werid one. just got no crank.
the car is a yaris 1.33 automatic on a 2010 plate.
any help would be great because my wife needs the car to take the kids to school one more week.
many thanks
mark

WeeYari · 07-19-2023, 04:18 PM

Other than ensuring your battery is indeed healthy, I believe you are in a situation beyond the abilities of a backyard mechanic. Professional help required on this one I fear.

BLH · 07-19-2023, 07:57 PM

You may want to try a internet search for a Yaris Diagnostic Code. U0100
I found many hits and possible issues. Including the ECM itself or a bus problem.
As pointed out. Unless the battery has issues it points to professional help maybe best.

WeeYari · 07-25-2023, 04:41 PM

Where have you gone?

Since this forum has no documented solution for a U0100, updates would be greatly appreciated by all users past, present and future.

07-19-2023, 01:29 PM	#1
Marko116 I've made a post! Drives: Yaris 1.33 automatic Join Date: Jul 2023 Location: Bristol Posts: 1	non start yaris automatic hello everyone, need some help with my wifes car, today it would not start, turn over the key and nothing, checked battery and i got 12 volts so its not that. check the codes and only found one code which was a u0100 code which is lost communcation with engine ecu. has anyone had this before??? i left the car overnight and try again but still will not start or turn over with the key, its a werid one. just got no crank. the car is a yaris 1.33 automatic on a 2010 plate. any help would be great because my wife needs the car to take the kids to school one more week. many thanks mark

07-19-2023, 04:18 PM	#2
WeeYari View User's Garage Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008 Location: Georgetown, Ontario, Canada Posts: 5,764	Other than ensuring your battery is indeed healthy, I believe you are in a situation beyond the abilities of a backyard mechanic. Professional help required on this one I fear. __________________

07-25-2023, 04:41 PM	#4
WeeYari View User's Garage Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008 Location: Georgetown, Ontario, Canada Posts: 5,764	Where have you gone? Since this forum has no documented solution for a U0100, updates would be greatly appreciated by all users past, present and future. __________________

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07-19-2023, 07:57 PM	#3
BLH Drives: 2007 Yaris Sedan Join Date: Apr 2009 Location: CT Posts: 278	You may want to try a internet search for a Yaris Diagnostic Code. U0100 I found many hits and possible issues. Including the ECM itself or a bus problem. As pointed out. Unless the battery has issues it points to professional help maybe best.