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June 1, 2023 Service bulletin

An engine software defect exists in certain vehicles equipped with EMY17 MX-13 and MX-11 engines that...

Peterbilt technical service bulletin E279 for 2017 Peterbilt 579, 2017 Peterbilt 389 and 2017 Peterbilt 388 and others.

Bulletin number
E279
Component
Engine and engine cooling: exhaust system: emission control
Summary
An engine software defect exists in certain vehicles equipped with EMY17 MX-13 and MX-11 engines that pertains to timer action and count calibrations for a time-based diagnostic. This diagnostic action checks fuel pressure and has no negative impact on tailpipe emissions. This soft ware may incorrectly set DTC – P1092.

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