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Discussion Starter · #1 ·
I am suddenly getting the following codes
U0121, C0021-01, C2100-16. When these pop up, the car loses power and then wont start until I clead the codes. Then it runs fine until the codes pop up again. This started after some aftermarket lights were installed and left on a few times by my kid. Any ideas?
 

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there's a few things - voltage level drops will create all sorts of error codes

if there's any ground wires loose or oxidized ground connections - one thing to check.

another is if there are taps made off the fuses in the engine bay power module - some of the aftermarket fuse taps can create problems - I've seen that one before. Some connectors can be pretty poor quality
 
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