2013 Infiniti G37 — battery dies after the car sits for a weekend

This is usually cheaper to test than to guess. Write temp, speed, and in-gear vs coast when the 2013 Infiniti G37 does it — then decide on parts. If the cheap test changes it, stop and reassess. When does it actually happen? Make the next action something you can finish this week. I'd rather look cautious in this thread than stuck later.

Log the conditions before you spend. Get a real battery/charging test on the 2013 Infiniti G37, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. On “battery dies after the car sits for,” that was the fork that mattered for me. Was this after sitting overnight? I keep a notes app thread for this now.

Ask what changed right before it started. Move a coil or plug on the 2013 Infiniti G37 if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. This is from a 2013 Infiniti G37 in San Diego with 183,500 miles. Have you gotten a second quote in writing? Make the next action something you can finish this week. Video is ugly but it shows the hesitation.

OP update: scanned the 2013 Infiniti G37 again and still only have the one pending code, no new lights. If that fails I'll eat the diagnostic fee.

I wouldn't throw parts yet. A pressure test beats staring at a dry driveway if the 2013 Infiniti G37 is losing coolant with no puddle. That's the branch I'd chase this week. Have you gotten a second quote in writing? Trying not to diagnose from the couch.

I'd want a measurement, not a hunch. Two 2013 Infiniti G37s can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. Do that first. Parking it somewhere I can hear it better next time.