System: Powertrain (P-Code)
SAE Standard (Generic)
Family: System Voltage Charging Circuit
Code P0562: System Voltage Low
Diagnostic & Technical Explanation
Code P0562 (System Voltage Low) sets when the ECM's own B+ sense circuit measures system voltage outside its normal window or fluctuating erratically, pointing at the vehicle's overall charging/electrical system rather than a single sensor. Causes are a weak or failing battery, a charging system undercharging or overcharging, corroded main power/ground straps, or a parasitic draw combined with marginal alternator output.
First-listed procedure
Rank #1
Test battery condition and terminal connections
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: System Voltage Charging Circuit
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)