DURAMAX-P0676 moderate Duramax ›

Cylinder 6 Glow Plug Circuit

The DURAMAX-P0676 (Duramax) diesel fault code means: Cylinder 6 Glow Plug Circuit. This is a moderate severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
intermediate
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What Are the Symptoms of DURAMAX-P0676?

  • Check Engine Light on
  • Hard starting when cold
  • White smoke or rough running after a cold start

What Causes DURAMAX-P0676? (Most Likely First)

  • Failed cylinder 6 glow plug High
  • Damaged wire or loose connection at the glow plug High
  • Glow plug controller fault Low

Can I Still Drive with DURAMAX-P0676?

Yes, but fix soon. DURAMAX-P0676 is rated moderate severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring it.

Frequently Asked Questions

What does P0676 mean on a Duramax?

P0676 means Cylinder 6 Glow Plug Circuit. The glow plug control system has detected a fault in the circuit for the cylinder 6 glow plug.

Is P0676 a Duramax-specific code?

No. P0676 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-P0676?

  1. Measure the cylinder 6 glow plug resistance and compare it with the other cylinders and the specification.

  2. Inspect the glow plug wire and terminal.

  3. Check the controller output to cylinder 6 if the plug and wiring test good.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines P0676 as a generic OBD-II code)

P0676 on Other Platforms

The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:

Gas / Automotive (OBD-II) Generic OBD-II definition for P0676

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More Duramax codes → Diesel home All diesel codes Heavy-duty Guides

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