How do you repair a 1345 trouble code gm?

A 1345 trouble code in GM vehicles typically indicates a problem with the camshaft/crankshaft position correlation. To repair it, first check the wiring and connectors for damage or corrosion, as these can cause signal issues. Next, inspect the camshaft and crankshaft sensors for faults and replace any defective components. Finally, clear the code and perform a test drive to ensure the issue is resolved; if the code reappears, further diagnosis of the timing chain or engine timing may be necessary.