P0562 on Mercury
System Voltage Low
P0562 on Mercury vehicles indicates system voltage low. Au7o has documented this code across 1 Mercury model — most commonly on Cougar. 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 Mercury range from $400 to $850, 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 Mercury by Model
Mercury Cougar(1 issue)
- Premature Alternator Failure and Buried Alternator Location - 2.5L V61999-2002
On the 1999-2002 Cougar's 2.5L Duratec V6 the alternator is mounted low at the rear of the engine directly beneath the exhaust manifold, where constant heat soak shortens its life — owners report going through multiple alternators, with one documented case of five in three years. The location also makes replacement notoriously difficult: a hidden mounting bolt is blocked by the exhaust manifold, O2 sensor and intermediate shaft, driving up labor cost. A related factory defect (NHTSA recall 01V031000) involved a misrouted, under-torqued battery cable at the alternator that could contact the power steering line and cause a fire, stall, or no-start.
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View P0562 across all makes →Frequently Asked Questions
What does P0562 mean on Mercury?▼
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 Mercury specifically, this code is documented across 1 model.
What causes P0562 on Mercury vehicles?▼
Common causes on Mercury: 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 Mercury?▼
Repair costs on Mercury range from $400 to $850, depending on the specific model and root cause.
Which Mercury models have P0562 documented?▼
Au7o has documented P0562 on 1 Mercury model: Cougar.