Freightliner with Cummins B6.7 GHG24 engines - shutdown for low oil pressure

Applicable Vehicles

M2 platform vehicles built after January 3, 2024 with a Cummins B6.7 engine certified to GHG24 requirements (Cummins B6.7 CM2450 B155B engines). These engines use an oil pressure sensor, instead of an oil pressure switch.

This solution does not apply to any other Cummins engines.

NOTE: As of March 6, 2024, Cummins has provided a "clean date" for each engine manufacturing plant for engines with a new calibration to address this issue. There are still several thousand engines that may have reached dealers, body builders, and/or customers that were not updated.

Symptoms

The following symptoms may be reported by a driver:

1. Upon engine initial start-up, engine oil pressure will initially "spike" to 100 PSI on the oil pressure gauge.
2. With sufficient load on the engine, and if the coolant has not reached operating temperature, the following sequence of events may occur:
   1. The oil pressure reading may drop to approximately 15 PSI on the gauge
   2. After the oil pressure has dropped, the Check Engine and Stop Engine lamps will turn on
   3. The engine will shut down after 30 seconds.

Further, if a driver re-starts an engine that has shut down with the Stop Engine lamp illuminated without turning the ignition key to the Off position for at least 2 minutes, the engine may continue to shut down.

If Cummins InSite is used to view fault codes, codes 143, 415, and/or 435 may be active.

Issue

The issue is a known issue in the engine calibration and is addressed in Cummins TSB 240031, which is attached to this Service Solution.

Solution

Follow the troubleshooting information in Cummins TSB 240031.

Some dealers have ordered an oil pressure sensor without referring to the Cummins bulletin. Replacing the oil pressure sensor without following Cummins TSB240031 will not address the issue.