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Discussion Starter · #1 ·
2011 Malibu LT 4cyl started would not shift into any gear dash warning
Flashed no warning after that. Removed neg battery cable for a few minutes then reconnect vehicle started and shifted into drive , drove 40 miles parked vehicle turned vehicle off would not start . code U0073 was only code. Battery was old so installed new charged battery code U0073 still perment. ( old battery was confirmed bad) ,checked visible grounds cleaned , still no crank or start . code reader I have is a basic reader that can read and rest most codes. Visually Inspected as much of wiring harness as possible, seemed ok
 

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You may need a more advanced scan tool that reads the code ''deeper''.
|What Does the U0073 Chevrolet Code Mean?
Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.
 
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Discussion Starter · #3 ·
Thank you.
I rechecked harnesses, repositioned 1 ,cycled key a few times got the anti theft icon on cluster then it went off then car started normal multiple times test drove and no codes . The anti theft icon was not illuminated while I was unable to start the car. Thank you very much for the information it is very helpful .
 
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