Heavy-duty truck engine quality has improved from 2010, after technology changes related to emissions standards revisions caused a spike in engine-related problems during recent years, according to the J.D. Power and Associates 2011 U.S. Heavy-Duty Truck Engine and Transmission Study released Sept. 1.
The 2011 study finds that 42 percent of owners of heavy-duty truck engines that are one model-year old report experiencing some type of engine-related problem, down from 46 percent last year. However, this is still well above the historically low average in 2004, when 26 percent of owners of truck engines that were two model-years old reported experiencing a problem. This low problem incidence level occurred prior to implementation of two rounds of emissions standards revisions in 2007 and 2010.
The most-commonly reported engine problems are issues with the exhaust gas recirculation valve (cited by 23 percent of owners) and electronic control module calibration (21 percent).
Also in 2011, engine problems have decreased to an average of 66 problems per 100 vehicles (PP100) from 72 PP100 in 2010. As a result, satisfaction with engines has increased by 22 points to an average of 739 (on a 1,000-point scale).
Navistar’s International MaxxForce engines rank highest in customer satisfaction with a score of 760 and perform particularly well in four of eight factors: engine reliability and dependability, engine warranty, vibration at idle and average fuel economy.
"Until a formal regulation is established with clear guidelines and borders ...