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Today my car turned off and would not restart while at a stop light. It has done this a couple of times in the past, always while idling but always came right back on. All the lights, radio and such stay on, even the green light on the push button start. Had the battery checked and it was fine. Today, the car would not restart for a couple of minutes, again all the power was there. Took it to get a diagnostic and received and U0420-71 Code - invalid data received and a C0800-03 code - low voltage. Powertrain tested fine as well as service interval light. Any ideas on what to do would be appreciated. Trying to avoid a big expense, if possible.

Thanks!
 

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2016 Malibu 1LT 1.5T/6-speed 6T40
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Welcome.

What year is this car, which trim (L/LS/RS/LT/Premier) and how old is the battery? If that battery is more than 3 years old replace it. If this is a 1.5T the OE battery is an ACDelco 48AGM.
 

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2016 Malibu 1LT 1.5T/6-speed 6T40
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3,665 Posts
If you are trying to avoid expensive diagnosis and possible unnecessary part replacement, replace the battery. I can't say 100% it is the battery as there is always an exception, but having read this behavior before it has always been the battery in the past. A battery that is 4.5 years old is due for replacement anyway.
 
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