P0562 on Chevrolet: How to Diagnose & Fix
System Voltage Low
4 Chevrolet models · 5 documented issues · 1 critical · $150-$1,500 repair
P0562 on Chevrolet by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Vehicle will not start
- Multiple unrelated electrical warnings or module faults at once
- Sudden rather than gradual loss of 12V system capability
How to Fix
Take the car to a Chevrolet dealer and have Bulletin #25-NA-056 applied for the 2024 E-Ray. Critically, do not let any shop substitute a conventional lead-acid battery for the 12V lithium-ion unit - GM states that a number of vehicle conditions will occur with the missing control module - and never charge the 12V lithium battery above 14.5 volts or use a non-approved charger during service programming. Diagnosis should use GDS2 data from the battery management control module rather than an external load test, which is not supported on this battery.
Sources for this issue (2)
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.
Common Symptoms
- Infotainment screen, radio and cluster remain on after shutdown
- Battery flat after the car sits overnight or a few days
- Vehicle fails to restart
- Multiple spurious stored fault codes
- Electric door release inoperative with a dead battery
- Condition temporarily cleared by disconnecting the negative terminal
How to Fix
If the screens stay lit after you walk away, that is the diagnostic — the car is not sleeping and the battery is being consumed. Have a dealer perform a proper parasitic draw test after allowing full module sleep time (typically 45 minutes or more, not a quick reading), and have them check for available module software updates, since sleep-state faults on this platform are commonly a calibration issue rather than a failed component. Do not simply keep replacing batteries. In the meantime, keep a quality battery maintainer on the car whenever it sits more than a few days — GM recommends this for the C8 regardless. Learn and practice the manual door release procedure before you need it, because a flat battery on this car locks you out of the normal electric door buttons. Disconnecting the negative terminal will reset the modules and clear the condition temporarily, but it will return until the underlying draw is found.
Sources for this issue (2)
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.
Common Symptoms
- Car completely dead - no dash, no power button response, no door unlock
- Dead 12V battery after only a few days parked
- Battery drains overnight but not while parked during the day
- Cannot start a charge session even though the traction pack has charge
- Charge cable locked in the port and will not release
- Repeat 12V battery failures within months of replacement
- Multiple module warning lights after a jump start
How to Fix
First confirm the 12V battery itself: a lot-aged or repeatedly deep-cycled AGM must be replaced, not merely recharged. Then measure parasitic draw with the car asleep for a full 45-60 minute module shutdown period; a healthy Bolt settles to a low milliamp draw. Persistent drains have been traced to modules failing to sleep and to a DC-DC/APM top-up cycle that is not running - both warrant dealer diagnosis, and the charging and battery control modules fall under the EV component warranty. Practical mitigation: keep traction pack state of charge above roughly 30%, plug in when parked long-term, and use a 12V maintainer if the car sits for weeks. Learn the emergency manual charge-port release before you need it.
What you need to diagnose it
The fix here starts with a test, not a part — which repair you need depends on what the test finds.At least one code uses a manufacturer-specific format. No scanner recommendation is shown because family-level coverage cannot prove it can read that code.
UNI-T UT210E Low-Current DC Clamp Meter
1 mA resolution on the 2 A range — a 0.1 A meter reads a 50 mA drain as zero
$40–$70View
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Testing and isolating the fault is DIY work. Replacing or reprogramming a control module is not — most are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
Sources for this issue (4)
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.
Common Symptoms
- Start-stop system not functioning
- Battery warning messages
- Multiple warning lights on startup
- Slow cranking
- Electrical accessories resetting
How to Fix
Replace the AGM battery with a genuine ACDelco AGM battery — standard flooded batteries are not compatible with the start-stop system. After replacement, a battery sensor reset via a scan tool is required. Some owners permanently disable start-stop with aftermarket modules if they find the feature annoying.
Sources for this issue (1)
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.
Common Symptoms
- No crank, solenoid clicks, lights stay on
- Radio and HVAC display turning off and on
- Service StabiliTrak / Service Traction / Service Steering messages
- Battery Saver Active message
- Interior and exterior lights flickering
- Repeat battery replacements that don't fix it
How to Fix
Do a voltage-drop test across the negative cable from battery post to engine/body ground while cranking - more than roughly 0.2V indicates the bad crimp. Cutting and re-terminating rarely holds; replace the complete negative battery cable assembly with the updated GM part and clean the body and transmission ground points. Check VIN eligibility under Special Coverage 14311 first.
Sources for this issue (3)
P0562 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0562 mean on a Chevrolet?
P0562 stands for "System Voltage Low." P0562 means the engine computer detected that the vehicle's system (battery/charging) voltage is too low for normal operation. The computer constantly monitors charging-system voltage because nearly every sensor, injector, and module depends on a stable supply; sustained low voltage can cause erratic behavior and other false codes. This is most often a charging or battery problem — the alternator isn't keeping up, the battery is weak, or there's resistance in the cables/grounds. You may notice dim lights, slow cranking, or multiple unrelated warning lights. On Chevrolet it is documented across 4 models: Corvette, Bolt EV, Blazer, Cruze.
What are the most common causes of P0562?
The most common causes of P0562 are: Failing alternator or worn alternator brushes/regulator, Weak, old, or discharged battery, Corroded, loose, or damaged battery cables and terminals, Bad engine or chassis ground connections, Slipping, glazed, or broken serpentine/drive belt, High resistance in charging system wiring or fusible link, Faulty PCM voltage reference or charging-system control. The specific cause varies by vehicle.
How much does it cost to fix P0562 on a Chevrolet?
Published repair estimates on Chevrolet range from $150 to $1,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0562 on a different make?
View P0562 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.