DDE Pass Rate 2026: What the Data Shows

What a DDE Pass Rate Can and Cannot Tell You

Candidates searching for a DDE pass rate usually want one thing: a number that tells them how worried to be. For the National Designated Duty Engineer Steam/Motor/GT credential, that number is harder to pin down than it looks, and any site that hands you a confident percentage deserves a second look. This article does not invent one. Instead it explains what the DDE structure implies about difficulty, why a blended pass rate would mislead, and how to prepare in a way that holds up regardless of what any statistic says.

The DDE is administered through the United States Coast Guard National Maritime Center (NMC). It is a licensing-track examination for engineers, not a vendor certification with a single standardized test form. That distinction drives everything that follows. If you want the broader difficulty picture alongside this one, see How Hard Is the DDE Exam? Complete Difficulty Guide 2026.

Why There Is No Single DDE Pass Rate

A pass rate is only meaningful when it measures one population taking one exam under one set of conditions. The DDE does not fit that mold. The published catalog describes a set of module-topic groups across plant types. It is not a list of six compulsory modules that every applicant sits. Two engineers pursuing the DDE can face entirely different combinations of modules, and neither combination is "the" DDE exam.

Several variables break a blended figure

• Endorsement requested: The original endorsement and each increase in scope draw on different module sets.
• Horsepower category: Unlimited and limited-horsepower routes use separate catalogs.
• Plant type: Motor, steam and gas turbine plants each have their own module.
• NMC approval to test: Which modules you are cleared to sit depends on individual approval, not a universal template.

Averaging results across all of these would produce a number that describes no real candidate. A motor-plant specialist adding gas turbine scope faces a different challenge than a first-time applicant working through a full original endorsement. If you are still sorting out where you fit, start with DDE Requirements 2026: Eligibility, Prerequisites & How to Qualify.

How Your Endorsement Route Shapes Your Odds

The examination guide describes the DDE01 Motor-Gas Turbine original and increase-in-scope combination as Q620, Q622, Q623, Q624 and Q625. Notice what that list includes and omits. Q621 Steam Plants appears in the current NMC catalog, but it is not part of the DDE01 Motor-Gas Turbine combination described in the guide. Preserve that distinction when you plan, because a study plan built around the wrong module set wastes weeks.

An increase in scope through a single module is a much narrower undertaking than a full original combination. A candidate who already holds motor-plant knowledge and needs only Q622 is solving a different problem from a candidate sitting five modules. Neither should compare their prospects to a headline pass rate that ignores the difference.

Module-by-Module: Where Candidates Struggle

Because no official weights are published, the useful way to think about difficulty is by the breadth and depth of each module's topic catalog. Below is each domain with the specific topics the published catalog names. For a fuller walkthrough, see DDE Exam Domains 2026: Complete Guide to All 6 Content Areas.

Note the recurring topics: casualty control, safety, control systems, automation systems and thermodynamics each surface in several modules. That overlap is useful. Time spent mastering them pays off more than once, and it is one reason a structured plan beats cramming. The DDE Study Guide 2026: How to Pass on Your First Attempt covers that planning in depth.

How to Read Any Pass-Rate Claim You Encounter

When you see a DDE pass rate quoted on a forum, a training-school brochure or another website, run it through a short checklist before letting it shape your expectations.

1. Which module or combination? A figure for one module says nothing about the others.
2. Which endorsement route? Original, increase in scope and limited horsepower are different populations.
3. Which time period? The regulations referenced in the examination guide took effect 2014-03-24, and the current NMC module-topic index may differ from older descriptions.
4. Who measured it? A training provider reporting its own graduates is describing a self-selected group, not all test-takers.
5. Is it first attempt or any attempt? Retake-inclusive figures look more favorable than first-attempt figures.

If your underlying question is really about the score threshold rather than the population results, DDE Passing Score 2026: Exactly What You Need to Pass addresses that directly. For the version of this topic hosted as its own page, see DDE Pass Rate 2026: What the Data Shows.

Route and Module Comparison at a Glance

Treat this table as orientation, not as a substitute for your own NMC approval to test. Confirm your exact module assignment with the NMC before building a study calendar.

A DDE-Specific Preparation Sequence

Since difficulty here is driven by module breadth and overlap, the most defensible plan sequences modules by dependency rather than by a generic calendar. This is the one place where scheduling advice belongs, and it is tied to the actual module content.

Adjust this to your route. If you only need one increase-in-scope module, compress accordingly. For a quick-reference companion while you work through these topics, keep the DDE Cheat Sheet 2026: One-Page Review of Must-Know Facts nearby, and use realistic practice questions from the DDE practice test site to find the gaps a pass-rate figure could never reveal.

Frequently Asked Questions