Cummins Looking Into Ram HD Engine Emissions Certification Process

Steph Willems
by Steph Willems
cummins looking into ram hd engine emissions certification process

Cummins, maker of the beastly 6.7-liter inline-six diesels found beneath the hoods of various Ram Heavy Duty pickups, claims it is looking into its emissions certification and compliance process.

In a statement released Monday, the decision to investigate the process came after “conversations” with the Environmental Protection Agency and California Air Resources Board. Specifically, the probe targets the revamped engines used in Ram’s 2019 HD line, not the 5.0-liter V8 found in the Nissan Titan XD.

“This review is being conducted with external advisors to ensure the certification process for Cummins pickup truck applications is consistent with its internal policies, engineering standards and applicable laws,” the company said. “Cummins has voluntarily disclosed the review to our regulators and other agencies and will cooperate with them to ensure a complete and thorough review and implement recommendations for improvement.”

For 2019, the Ram HD buyer has a choice of two Cummins flavors: a 370 horsepower, 850 lb-ft mill available in the Ram 2500 and 3500, and a class-leading 400 hp, 1,000 lb-ft variant available only in the 3500 (when equipped with Aisin automatic transmission).

Numerous changes separate the new 6.7L mills from their predecessors. Among them, a compacted graphite iron block that drops weight by 60 pounds, a new cast-iron cylinder head (featuring high-temperature exhaust valves actuated by in-block hydraulic lash adjusters), a new fuel delivery system, and new connecting rods, bearings, and crankshaft.

While neither Cummins nor Fiat Chrysler has elaborated on the probe, it brings to mind the recent investigation launched by Ford into how the company determines road load specifications for the fuel economy and emissions certification process. Ford now finds itself subject to a Justice Department probe.

“We are reviewing our certification process and it’s too early to tell what, if any actions, would or might be needed,” Jon Mills, a Cummins spokesman, told Bloomberg.

When contacted by the publication, an FCA spokesperson said the automaker is happy to cooperate as needed.

Ram’s 2019 HD line went on sale this month, with the upgraded turbo-diesel powerplants serving as a standout feature FCA hopes to beat its competitors over the head with. Execs no doubt hope the probe turns up zilch. The EcoDiesel fiasco is still too close in the rear-view.

[Images: © 2019 Matthew Guy/TTAC, Cummins]

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5 of 7 comments
  • Illan Illan on Apr 30, 2019

    Steph WIllens, i think the cummins 1k torque monster will be also available on the 2500. but without the House pulling towing capacity if the 3500.

    • See 1 previous
    • Mason Mason on May 01, 2019

      @jack4x 370 HP 850 lb ft in the 2500 and 3500 equipped with 68rfe, 400 HP 1000lb ft in 3500 equipped with Aisin Seiki AS69RC

  • HotPotato HotPotato on May 04, 2019

    Holy crap, those are powerful engines. Like, briskly motivate a Greyhound powerful.

    • JimZ JimZ on May 04, 2019

      except a Greyhound would use a 12-13 liter engine to get those numbers, because they're more interested in longevity and not getting into p*ssing matches with pickup truck douches.

  • Mike Beranek Any car whose engine makes less than 300 ft-lbs of torque.
  • Malcolm Mini temporarily halted manual transmission production but brought it back as it was a surprisingly good seller. The downside is that they should have made awd standard with the manual instead of nixing it. Ford said recently that 4dr were 7% manual take rate and I think the two door was 15%.
  • Master Baiter It’s hard to make predictions, especially about the future. It will be interesting to see if demand for Ford’s EVs will match the production capacity they are putting on line.
  • Brett Woods 2023 Corvette base model.
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