Cummins Inc. and Cummins Westport Inc. are recalling a total of 25,013 Cummins Westport Model ISL G and ISX12 G natural gas engines manufactured between 2007 and 2014 due to a risk of elevated exhaust temperatures or flames from the exhaust under certain conditions.
Ice from condensation may form in or around the intake manifold temperature/pressure sensor on engines operating in sub-freezing ambient temperatures without cold weather aids. This ice may interfere with the proper operation of the pressure sensor function of the intake manifold temperature/pressure sensor, causing the engine’s ECM to fuel the engine improperly, resulting in elevated exhaust temperatures and the possibility of flame from the exhaust pipe. In most cases, this improper operation will result in the engine running rough and misfiring.
During this improper operating condition, bystanders may be exposed to the elevated exhaust temperatures or flames from the exhaust pipe, possibly resulting in burns. Combustible materials near the tailpipe may be ignited, resulting in a fire.
In January, Cummins Westport received notification from the field of two vehicles reporting flames from exhaust. The company investigated, and was able to duplicate the condition.
Based on the results the investigation, Cummins and Cummins Westport decided to initiate the voluntary recall. A revised ECM calibration with improved diagnostics and control functionality has been released for production and for service.
To date, no reports of injuries, fatalities, accidents or fires related to the condition have been received.
Cummins Westport will work with the vehicle OEMs to identify and notify affected owners. A new ECM calibration will be installed.