Conditions for Setting the DTC
WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
B1451 01
Ignition output is not active and a short to battery is detected 3 consecutive times.
B1451 02
Ignition output is active and a short to ground is detected 3 consecutive times.
B1451 04
Ignition output is not active and an open circuit is detected 20 consecutive times.