P0562 on Chevrolet

The AGM battery required for the auto start-stop system degrades prematurely, often failing within 2-3 years. When the battery weakens, the start-stop system disables itself and various electrical warnings appear. The auxiliary battery (on equipped models) can also fail, compounding the issues.

The Bolt EV is never fully powered down; modules continue to wake for telematics, charge scheduling and pack maintenance, and the DC-DC converter is supposed to top the 12V accessory battery from the traction pack on a periodic wake cycle. Owners across chevybolt.org and mychevybolt.com report that cycle failing or being outrun by parasitic draw, leaving a flat 12V after as little as three days parked. Reports cluster on cars that sat on dealer lots for months (which permanently degrades the 12V), on cars whose top-up algorithm becomes less aggressive when traction pack state of charge is low, and on cars with a genuine parasitic draw where the drain happens overnight but never during the day. The consequence is worse than on a gas car: with a dead 12V the Bolt will not power up, will not accept a charge, and the charge port latch stays locked with the cable trapped in the port. Owners report repeat failures - one 2021 car died five times, another killed a brand new battery within a month.

GM released Bulletin #25-NA-056, 'No Start, Multiple Electrical System Concerns,' with fitment limited to the 2024 Corvette E-Ray. The E-Ray is the only Corvette that uses two lithium-ion batteries - a high-voltage pack for the front electric axle plus a 12-volt lithium-ion low-voltage battery with its own control module in place of the conventional lead-acid unit - and GM warns that the 12V lithium unit does not decay gradually like lead-acid but 'falls off sharply,' can be damaged above 14.5 volts, and permanently latches its contactors open if deeply discharged. That architecture is the plausible reason the no-start bulletin applies to the E-Ray alone.

C8 owners across several model years report that the car's control modules do not enter sleep after shutdown, leaving the radio, infotainment screen and instrument cluster powered up with the vehicle off. The battery is drained overnight and the car will not restart. NHTSA complaints document both halves of this: a 2024 owner reported the radio, infotainment screen and instrument cluster had failed to turn off and the vehicle subsequently failed to restart, and a 2022 owner reported battery drain causing a no-start that required disconnecting the negative battery terminal to reset the modules and clear stored codes. On the C8 this is more than an inconvenience — the battery lives in the rear compartment and a fully dead battery can leave the doors, which are electrically released, difficult to open, and it can force manual release procedures. Cars that sit between drives, which describes most Corvettes, are disproportionately affected.

The factory negative battery cable was crimped with insufficient force at the battery terminal clamp. Over time the crimp oxidizes and internal resistance climbs, so the whole vehicle ground becomes marginal. The symptom set is famously scattershot: flickering lights, radio and HVAC display cycling off and on, phantom ABS / StabiliTrak / Service Steering messages, 'Battery Saver Active', no turn-signal chime, and eventually a no-crank where the lights work and the starter solenoid clicks but the engine won't turn over. Owners frequently replace batteries and starters before finding it. GM issued Special Coverage 14311 extending coverage to 10 years / 120,000 miles.