P0562 on a GMC: Causes, Fixes & Repair Cost
🟠 Moderate severity · drivable
You can usually drive a GMC for a short time, but a failing charging system will drain the battery and can leave you stranded, so get it checked soon.
What P0562 means on a GMC
On a GMC, P0562 means the engine computer sees system voltage below about 10 volts. GMC trucks and SUVs need a strong charging system, so a weak battery or failing alternator is the usual cause.
Is P0562 common on GMCs?
P0562 is common on Sierras, Yukons, Terrains, and Acadias with aging batteries or failing alternators. Cold weather and heavy electrical loads can expose a weak battery quickly, and battery terminal corrosion is also a frequent culprit.
Commonly reported on: Sierra, Yukon, Terrain, Acadia.
Symptoms
- Check engine light on
- Slow cranking or hard starting
- Dim headlights
- Battery warning light on the dash
Common causes
- most common: Weak or old battery
- common: Failing alternator
- common: Corroded or loose battery terminals
- less common: Bad ground or charging wiring
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Test the battery and replace it if weak | Yes | $130–280 |
| Clean and tighten the battery terminals | Yes | $0–20 |
| Replace the alternator | Mechanic | $450–950 |
Frequently asked questions
Other common GMC codes
P0562 on other brands
Looking for the full (non-brand-specific) guide? See the P0562 code page →
Browse all GMC codes: GMC hub →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.