Webdifferential pressure sensor will read negative pressure if mounted incorrectly and will cause inaccurately controlled flow into the air intake manifold. Webpossible causes of this fault code include: The engine has been operating in a light load condition that prevents exhaust temperatures from being high enough to actively. Webjan 28, 2022 · the differential pressure reading is still at 0. 09inhg and when i step on the throttle the differential pressure reading slowly climbs to 0. 14inhg. Webthe diesel particulate filter (dpf) pressure sensor on a peterbilt semi truck with…