Freightliner Cascadia / Detroit DD13, DD15, DD16 & Cummins ISX etc. FAQsFreightliner Cascadia

Worn or damaged oil pump: If the oil pump is not functioning properly, it may not be able to generate enough pressure to circulate the oil properly. This can be fixed by replacing the oil pump. This along with the oil pick up tube o-rings that connect the oil pump to the suction manifold are both common issues on the DD series engines. Clogged oil filter: If the oil filter is clogged, it can restrict the flow of oil and cause low pressure. This can be fixed by replacing the oil filter. Low oil level: If the engine oil level is too low, it can cause low pressure. This can be fixed by adding more oil to the engine. Worn bearings: If the bearings in the engine are worn, they may not be able to properly support the moving parts of the engine, which can cause low oil pressure. This can be fixed by replacing the worn bearings. Worn or damaged oil pressure sensor: If the oil pressure sensor is not functioning properly, it may not be able to accurately measure the oil pressure. This can be fixed by replacing the sensor. Worn or damaged oil pick-up tube o-rings: The o-rings that connect the oil suction manifold to the oil pump can become worn or damaged over time, which can cause low oil pressure. Replacing the o-rings is usually the best way to fix this problem. These o-rings along with the oil pump are both common issues on the DD series engines. Other issues: There are a number of other potential causes of low oil pressure on a Detroit DD15 engine, such as a leak in the oil system, a faulty oil pressure gauge, or a problem with the oil pressure relief valve. These issues may require more specialized repairs.