J.D. Power finds heavy-duty engines improving

Oct. 16, 2007
Thanks to “heavy-duty truck maintainers” reporting fewer engine-related problems, Caterpillar and Cummins ranked highest in customer satisfaction in the J.D. Power

Thanks to “heavy-duty truck maintainers” reporting fewer engine-related problems, Caterpillar and Cummins ranked highest in customer satisfaction in the J.D. Power and Associates 2007 Heavy-Duty Truck Engine/Transmission Study, released today by the market-research firm. The study looked at engine used in vocational and P&D applications only.

According to J.D. Power, the study measures customer satisfaction with engines in two-year-old heavy-duty (Class 8) trucks by examining four “vital” engine factors: engine quality (30%); engine performance (26%); engine cost of ownership (22%); and engine warranty (22%). The 2007 study includes engines in ’05 model-year trucks-- the second model year impacted by the EPA Consent Decree that raised diesel engine emission standards.

The company pointed out that customer satisfaction with heavy-duty truck engines is measured in the Vocational segment (which it defines as truck body types used in such rugged job applications as dump, concrete and garbage/refuse recycling) and in the Pickup and Delivery segment (defined as non-vocational day cabs, typically used for city stop-and-go applications with a return to home base each night).

J.D. Power said Cummins ranked highest in customer satisfaction in the heavy-engine Vocational segment with an overall index score of 750 on a 1,000-point scale. “Cummins performs particularly well in the engine warranty, engine performance and cost of ownership factors,” noted the firm’s press release. Caterpillar closely followed Cummins in this segment with a score of 747, performing particularly well in engine quality, said J.D. Power.

Caterpillar ranked highest in customer satisfaction in the heavy-engine Pickup and Delivery segment with an index score of 754, stated J.D. Power, which noted it performed “well across each of the four engine factors. Caterpillar performs particularly well in the engine quality and engine performance factors.”

The study also found that heavy-duty truck maintainers are reporting fewer problems with their engines than they did in 2006. However, J.D. Power pointed out that “problem incidence remains much higher than with pre-emission regulation 2003 model-year trucks. Industry-wide, the average number of reported engine problems is 59 PP100 (engine problems per 100 vehicles)--down from an average of 70 PP100 in 2006, but still well above the average of 46 PP100 reported prior to the new emission standards.”

"We saw a large jump in problems from 2005 to 2006 as manufacturers introduced new technologies to meet the emissions regulations," said Brian Etchells, senior research manager in the commercial vehicle group at J.D. Power and Associates. "New technologies always introduce the possibility for more problems, so we were not surprised to see that in 2006. As expected, in 2007, we're now starting to see those problem counts gradually decline."

Other significant results noted by J.D. Power include:

  • Several engine components showed year-over-year quality improvements in the 2007 study. Two of the biggest improvements were for fuel injectors and turbochargers, which experienced large declines in quality in the 2006 study. Problem mentions for each of these components have declined by nearly 50% in 2007.
  • The most frequently cited engine problem for a second consecutive year was the exhaust gas recirculation (EGR) valve, which accounts for 17% of all engine-related problems reported—marking a slight increase compared to the 2006 study.
  • Customers are most satisfied with the performance of their engines, and least satisfied with the costs of ownership. In general, customers are dissatisfied with both the fuel economy of their heavy engines and with the cost of routine engine maintenance.

"New emission technology adds to the initial price of an engine, and also adds to the cost of maintenance through additional filters and components that need to be serviced," added Etchells. "Moving forward, an engine manufacturer that develops an emission technology that requires less maintenance or provides better fuel economy compared to competitors could really differentiate itself in the marketplace. It will be interesting to see how the different approaches employed by engine manufacturers to meet the increasingly strict emission regulations fulfill customer expectations for engine performance, quality and ownership costs."

The 2007 Heavy-Duty Truck Engine/Transmission Study was based on the responses of 2,677 “primary maintainers of two-year-old heavy-duty trucks (Class 8),” according to J.D. Power.

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