P0562 on Cadillac
System Voltage Low
P0562 on Cadillac vehicles indicates system voltage low. Au7o has documented this code across 3 Cadillac models — most commonly on CT4, ELR, XT6. 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. Typical repair costs on Cadillac range from $50 to $400, depending on the specific model and root cause.
Common Causes of P0562
- •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
P0562 on Cadillac by Model
Cadillac CT4(1 issue)
- Over-the-Air Update Leaves Modules Awake and Drains the 12-Volt Battery2025
A software defect in the serial data gateway module can leave vehicle modules awake after an over-the-air update completes, so the car never fully goes to sleep. The result is partial or complete 12-volt battery drain — the car will not start after sitting, or starts weakly and throws a cascade of unrelated module warnings caused by low system voltage. GM opened Customer Satisfaction Program N242435630 for the 2025 CT4 covering exactly this failure, holding affected inventory units from sale until reprogrammed. The same low-voltage-after-sitting complaint appears in owner discussion of GM's OTA update rollouts more broadly, so the symptom is worth checking on any OTA-capable CT4 that repeatedly wakes up with a dead battery.
Cadillac ELR(1 issue)
- Low 12-Volt Battery Can Prevent Module Wake-Up; Diagnose the Cause First2014-2015
A low ELR 12-volt battery can leave control modules unable to wake and prevent a normal start. GM also issued VIN-gated program 14395A for a bounded 2015 OnStar-module battery-drain condition; that program expired in 2017 and is not proof of a universal drain.
Cadillac XT6(1 issue)
- Auto Start-Stop Harshness and Battery Issues2020-2025
The auto start-stop system engages and disengages harshly, causing the vehicle to shudder on restart. The AGM battery required for the system degrades quickly, and when it weakens, the start-stop system becomes erratic or disables itself. Many owners find the system intrusive.
Looking for P0562 on a different make?
View P0562 across all makes →Frequently Asked Questions
What does P0562 mean on Cadillac?▼
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 Cadillac specifically, this code is documented across 3 models.
What causes P0562 on Cadillac vehicles?▼
Common causes on Cadillac: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0562 on a Cadillac?▼
Repair costs on Cadillac range from $50 to $400, depending on the specific model and root cause.
Which Cadillac models have P0562 documented?▼
Au7o has documented P0562 on 3 Cadillac models: CT4, ELR, XT6.