Hello again,
Okay, I stand corrected. It appears that Cadillac has taken a multitude of DTC's and rolled them into this one new DTC numbering system, exclusively for them. In the diagrams down below I have included the diagnostic troubleshooting guide for DTC P2A03 for your vehicle. Please go through this guide and get back to us with what you find out.
Thanks,
Alex
2CarPros
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Monday, March 16th, 2020 AT 11:39 AM