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  1. M

    2014 Chevy Sonic Sedan LT (1.8L) showing U0100 after swapping out Climate Control Panel and Transmission Shift Assembly

    For a final update. This did end up being the ECM. The downside is I purchased the ECM from Flagship One then, it still wouldn't turn over. I tried several things over a few week period. I ended up towing it to a Chevy dealer who said the "new" ECM wasn't working. They tried to program both...
  2. M

    2014 Chevy Sonic Sedan LT (1.8L) showing U0100 after swapping out Climate Control Panel and Transmission Shift Assembly

    Just an update...I checked every single fuse and swapped the "Start" and "Run/Crank" relays. That didn't help. I have an ECM on the way from Flagship that will be programmed to my VIN. I'll let you know how that goes.
  3. M

    2014 Chevy Sonic Sedan LT (1.8L) showing U0100 after swapping out Climate Control Panel and Transmission Shift Assembly

    I have a 2014 Chevy Sonic Sedan LT (1.8L). My Climate Control Panel and Transmission Shift Assembly quite worn so last I replaced them last night with newer, but used, pieces. I removed the center console and replaced the items fairly easily. After plugging every thing back in I found that the...
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