GMC Sierra 2500HD — Glow Plug Replacement Cost

Based on real repair records · last updated October 13, 2026
$415
typical range $237 – $660 (parts + labor)
typical labor time 2.5 hrs · parts $77 · labor $249 · the rest is shop fees & tax (medians)
Median and middle-half range computed from real GMC Sierra 2500HD glow plug replacement repairs.

What owners actually paid

$237
1 in 4 paid less
$415
half paid less, half paid more
$660
3 in 4 paid less

The shaded middle is where half of all these repairs landed: $237 – $660. A quote inside that band is normal. Cheaper or pricier isn't automatically wrong — but it's worth asking why.

What this repair is

Diesels don't have spark plugs — glow plugs preheat the cylinders so cold starts light off. Failed ones mean long cranking, rough running, and white smoke on cold mornings. They are usually replaced as a set, and on high-mileage engines a seized plug can turn a routine job into machine work, which is what the price spread reflects.

Is your quote fair?

If your quote lands between $237 and $660, it's inside the range where half of all real GMC Sierra 2500HD repairs of this kind land — and the typical job takes about 2.5 hours of labor. Quotes well below aren't automatically good news (economy parts, or related work skipped) and quotes above aren't automatically gouging (trim variants, premium parts, seized hardware) — but both ends deserve questions.

Other repairs on the GMC Sierra 2500HD

Take this to the shop

The FixDozer Fair Price Report puts this page on one printable sheet — the fair range, parts and labor split out, and what moves the price — so you can compare a written quote line by line.

Download the Fair Price Report (PDF)

View it online · Not sure what's wrong? Start from the symptom

Where these numbers come from. FixDozer computes statistics from a large, continuously updated body of real-world US automotive repair records.