Cummins ISB4.5 CM2150 Fault Code: 427 PID: SID 231 SPN: 639 FMI: 9 J1939 Data Link – Abnormal Update Rate.

Posted by PerDiezel Solutions on January 20, 2026

Circuit Description
Devices such as ABS controllers, autoshift transmissions, ASR systems, electronic displays, electronic information systems, electronic service tools, and vehicle electronic control unit(s) (VECUs) can communicate with the ECM over the SAE J1939 data link. Messages sent from the devices are received by the ECM and used for controlling the engine. The ECM also transmits information to these devices over the SAE J1939 data link.

Component Location
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes
The ECM does not receive a valid J1939 message from a multiplexed device for more than 1second. The ECM detects an open or short circuit condition in the J1939 data link harness.

Action Taken When the Fault Code is Active
-The ECM will log the fault code immediately when the diagnostic runs and fails.
-The ECM will use a default state as an input for the multiplexed device.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The fault code status displayed by the INSITE electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
-The “Reset All Faults” command in the INSITE electronic service tool can be used to clear active and inactive faults.

Possible Causes
-Electrical problems with the SAE J1939 data link wiring such as grounded, shorted, or open circuits
-The ECM (or another SAE J1939 device) tying up communications by sending too many consecutive messages
-The external OEM controlling device has malfunctioned or can no longer transmit on the data link.

Cummins ISB4.5 CM2150 Fault Code: 425 PID: 175 SPN: 612 FMI: 2 Engine Oil Temperature – Data Erratic, Intermittent, or Incorrect.

Cummins ISB4.5 CM2150 Fault Code: 418 PID: 97 SPN: 97 FMI: 0 Water-in-Fuel Indicator – Data Valid But Above Normal Operating Range – Least Severe Level.

Cummins ISB4.5 CM2150 Fault Code: 415 PID: 100 SPN: 100 FMI: 1 Engine Oil Rifle Pressure – Data Valid but Below Normal Operating Range – Most Severe Level.

Cummins ISB4.5 CM2150 Fault Code: 386 PID: SID 212 SPN: 3509 FMI: 3 Sensor Supply 1 Circuit – Voltage Above Normal or Shorted to High Source.

Cummins ISB4.5 CM2150 Fault Code: 358 PID: SID 254 SPN: 132 FMI: 2 Engine Intake Air Mass Flow Circuit – Data Erratic, Intermittent, or Incorrect.

Cummins ISB4.5 CM2150 Fault Code: 357 PID: 132 SPN: 132 FMI: 4 Engine Intake Air Mass Flow Circuit – Voltage Below Normal or Shorted to Low Source.

WARNING!