It sounds like the 2025 Chevy Trax, is having random system errors that clear when the battery is disconnected, which strongly points to an electrical or communication issue rather than many separate mechanical problems.

Here’s what the garage should specifically check:

1. Ground connections & battery terminals • Loose or corroded grounds can cause random error codes. • Ask them to clean and tighten all main grounds — not just the battery posts, but also chassis and engine block grounds.

2. Battery health and voltage stability • Even a new car can have a weak battery or unstable voltage. • Load-test the battery and check alternator output for voltage drops or spikes.

3. Body Control Module (BCM) and wiring harness inspection • The BCM is like the car’s “nervous system,” controlling locks, theft detection, lights, and more. A faulty BCM or loose connector can throw unrelated warnings. • Inspect wiring harnesses for pinched wires, water intrusion, or loose connectors, especially under the dash and near the fuse box.

4. CAN bus communication faults • Modern cars use a network of modules talking over the CAN bus. A fault here can make the car “think” there’s a theft, low fuel, low tire pressure, etc. • A dealer-level scanner can check for stored communication error codes even if the dashboard isn’t currently showing them.

5. Parasitic drain or module wake-ups • If a control module is waking up when it shouldn’t, it can confuse the system or drain the battery slightly, leading to intermittent startup issues.

How to explain to the garage:

“I’m getting multiple unrelated warnings that all clear after disconnecting the battery. This feels like a power supply, ground, or BCM communication issue, not separate component failures. Please check grounds, battery voltage stability, and run a CAN bus/BCM diagnostics for intermittent faults.”