What does code P0562 mean on a GMC and is it safe to drive?
P0562: System Voltage Low. Here's what it means on your GMC, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The PCM has detected that system voltage is below the acceptable threshold. Usually points to a failing battery, alternator, or a poor ground connection.
Common causes for your GMC
- Weak or failing battery
- Failing alternator not producing sufficient output
- Poor battery cable or ground connections
- Parasitic draw draining the battery
Symptoms
- Check Engine Light
- Dim headlights
- Electrical accessories acting erratically
- Hard starting or slow cranking
Typical fixes
- Load-test battery and replace if weak
- Test alternator output and replace if low
- Clean battery terminals and ground connections
Repair cost range
For a GMC, repairs for P0562 often fall between $100 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on GMC
GMC P0562 low voltage on Sierra and Yukon trucks typically means a failing alternator or battery. On Terrain with the 2.4L Ecotec, a faulty body control module can cause parasitic drain that depletes the battery overnight—check for excessive parasitic current before replacing the alternator.
Most commonly affected models