System Voltage Low
The DURAMAX-P0562 (Duramax) diesel fault code means: System Voltage Low. This is a moderate severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- intermediate
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What Are the Symptoms of DURAMAX-P0562?
- Check Engine Light on
- Slow cranking or no start
- Possible warning lights or erratic gauges
What Causes DURAMAX-P0562? (Most Likely First)
- Weak or failing batteries High
- Alternator not charging High
- Loose or corroded battery or ground connections High
- Parasitic drain Low
Can I Still Drive with DURAMAX-P0562?
Yes, with caution. DURAMAX-P0562 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P0562 mean on a Duramax?
P0562 means System Voltage Low. The engine computer is seeing a supply voltage below its normal range.
Is P0562 a Duramax-specific code?
No. P0562 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions GM uses to set it on its diesels are in GM service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DURAMAX-P0562?
Test the batteries and the charging voltage with a meter.
Clean and tighten the battery and ground connections.
Compare the voltage the engine computer reports with the voltage at the battery.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0562 as a generic OBD-II code)
P0562 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
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