Need Help with 2020 Duramax Block Heater Cord Replacement

Maintenance & Repairs
1

I’m looking for some guidance on replacing the block heater cord on my 2020 Duramax. I’ve noticed that the cord is starting to show signs of wear and I want to be proactive about replacing it before winter sets in.

Here’s what I’m dealing with:

  • Current Condition: The block heater cord has fraying and I’m worried it might short out.
  • Usage: I live in a colder climate, so I really rely on the block heater during the winter months.

What I need help with:

  1. Finding the Right Replacement: Where can I find an OEM or compatible replacement cord? Any specific brands or models that are recommended?
  2. Installation Instructions: Is this something I can do myself, or will I need a mechanic? What tools will I need?
  3. Troubleshooting: If I’m having issues with the new cord after replacing it, what are the common signs to look for?

Additional Info:

  • Vehicle: 2020 Duramax Diesel
  • Current Setup: Block heater is factory-installed and used regularly.

Any help, tips, or resources would be greatly appreciated! Thanks!

2

I recently replaced my block heater cord on my 2020 Duramax. Make sure to check the gauge size; a 10-gauge is recommended for better efficiency.

3

Absolutely! A thicker gauge will handle more current, so you won’t have any issues during cold weather. I went with a 10-gauge too!

6 Likes
4

Don’t forget to consider the length of your cord! Depending on where you park, you might need a longer one. 25 feet is a good starting length.

5

Thanks for that tip! I usually park pretty close to the outlet, so I might be fine with a shorter cord. Does anyone know the typical connector type for a 2020 Duramax?

6

The standard connector for the Duramax is a NEMA 5-15P. Just confirm before purchasing to ensure compatibility!

8 Likes
7

Great point! It’s always good to double-check compatibility. I had a friend buy the wrong connector and it was a hassle.

4 Likes
8

Don’t stress too much; it’s a straight swap out. Just make sure the new cord is rated for outdoor use. We don’t want any nasty surprises in winter.

9

Exactly! And be sure to check if it’s heat resistant too, especially if you live in a very cold area.

1 Like
10

Do you really need a cord that long though? Aren’t most outlets close by? Seems like 15 feet should do for most cases.

11

Well, it depends on your parking situation. If you’re like me and park across the driveway, you’ll definitely need more cord.

12

Just keep in mind, shorter cords can also overheat if they’re not rated properly for the current they’ll carry.

13

That’s a solid point! Always better safe than sorry when it comes to electrical stuff, right?

14

And if all else fails, you could always ask a local mechanic for recommendations. They have experience with these kinds of issues!

6 Likes
15

I recently replaced mine and it was pretty straightforward! You’ll need a socket set, a ratchet, and some dielectric grease. Just make sure the engine is cool before starting.

16

Great tips! Do you have a specific socket size that worked best for you?

17

Yes! I used a 13mm socket. Just remember to disconnect the battery before you start taking things apart to avoid any shock. It’s simple if you take it step-by-step.

18

Good call! Safety first! Any advice on where to route the new cord?

19

You want to route it away from any hot surfaces. Look for existing harnesses to follow. That’ll keep it safe from damage over time.

5 Likes
20

This is really helpful! I never thought about following the existing harnesses. Have you all done this without professional help?