GMC HD Duramax: Common Codes & Fixes
Real-world diagnostic data for the GMC HD Duramax. These are the codes techs see most often. Tap any code for the full vehicle-specific fix and the exact part.
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Frequently Asked Questions
What are the most common check engine light codes on a GMC HD Duramax?
The most commonly reported OBD-II codes for the GMC HD Duramax include P0671. Each code indicates a specific issue -- tap any code above for the full diagnostic breakdown.
How much does it cost to fix a check engine light on a GMC HD Duramax?
Repair costs vary by code. Many GMC HD Duramax fixes like gas cap replacement, sensor cleaning, or spark plug changes are under $50 in parts and can be done at home. More complex repairs like catalytic converter or transmission work can run $500-$2,000+ at a shop.
Can I drive my GMC HD Duramax with the check engine light on?
It depends on the code. A steady check engine light usually means you can drive short distances safely. A flashing check engine light means stop driving immediately -- continued driving can cause serious engine damage. Scan the code first to know what you are dealing with.