Is your Duramax throwing glow plug codes? Don’t worry, you’re not alone. My 2006 GMC Sierra 3500 was flashing P0671-P0678 codes, indicating glow plug issues. Let’s dive into why this matters and how to fix it yourself.
Why Glow Plugs Matter
According to GM, glow plugs warm the incoming air and fuel mixture, making it more combustible. Failing glow plugs can lead to:
- Poor idle
- Low-speed performance issues
- Hard starting in cold weather
While I wasn’t experiencing these symptoms, with winter approaching, it was time to tackle this issue head-on.
Choosing the Right Glow Plugs
Here’s a crucial tip: There are two styles of glow plugs, and your VIN doesn’t always tell the whole story. I learned this the hard way!
Pro Tip: Remove one glow plug first to confirm the correct type. You’ll need either:
- Plugs with threads halfway up the shaft
- Plugs with threads at the end next to the hex
For my Duramax, it was the first option.
Replacement Process: A Tale of Two Sides
Driver’s Side:
- Remove the inner fender panel
- Take off the wheel
- Use a moving pad across the suspension for comfortable access
- Navigate around charge piping and steering components
Passenger Side (The Easier Half):
- Remove the air filter housing and track
- Access all 4 glow plugs from above
Testing Your Glow Plugs
Follow these steps to ensure your new glow plugs are in top shape:
- Check resistance value (GM recommends 0-1 ohm)
- Replace if outside this range or if there’s a short
- Always test new parts before installation
Warning: There’s been an increase in faulty new parts. Don’t skip this step!
Conclusion
Replacing glow plugs on your Duramax isn’t rocket science. With the right tools and this guide, you can knock this out in an afternoon. Not only will you save on mechanic fees, but you’ll also ensure your truck starts smoothly as temperatures drop.
Have you tackled this job on your Duramax? Share your experiences or questions in the comments below!
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