Cummins ISB CM850 (2003-06) Fault Code: 287 PID: 91 SPN: 91 FMI: 19 SAE J1939 Multiplexing Accelerator Pedal or Lever Sensor System Error – Received Network Data Error.

Posted by PerDiezel Solutions on January 18, 2026

Cummins ISB CM850 (2003-06) Fault Code: 287 PID: 91 SPN: 91 FMI: 19 SAE J1939 Multiplexing Accelerator Pedal or Lever Sensor System Error – Received Network Data Error. The OEM vehicle electronic control unit (VECU) detected a fault with its accelerator pedal.

This fault can occur when the OEM VECU detects an error on the accelerator and or idle validation switch. The ECM has been set up properly (components enabled and OEM VECU source addressed correctly) to receive multiplexed information for the idle validation switch states and accelerator position over the J1939 datalink from an OEM VECU, and the OEM VECU is transmitting the message for that component.

The three types of errors that can occur for this fault are:

1)When the accelerator is depressed and the OEM VECU reads accelerator position as greater than 0%, but the idle validation switch indicates it is in the idle position. This fault status is transmitted to the Cummins ECM on the J1939 datalink, which causes this fault to occur in the Cummins ECM.
2)When the accelerator is released and the OEM VECU reads accelerator position as 0%, but the idle validation switch indicates it is not in the idle position. This fault status is transmitted to the Cummins ECM on the J1939 datalink, which causes this fault to occur in the Cummins ECM.
3)The OEM VECU determines that the accelerator signal line is shorted high or shorted low.

NOTE: It is still possible to get a Fault Code 285 or 286 if there is an incorrect setup in the OEM VECU or Cummins ECM, for other components, or the accelerator and idle validation switch, or if the datalink is damaged. OEM configurations must multiplex the accelerator and idle validation switch inputs together to allow the use of the J1939 multiplexing and limp home feature for these components. INSITE? can be used to monitor multiplexed components.

Possible repairs:

1)Replace the OEM harness.

Cummins ISB CM850 (2003-06) Fault Code: 286 PID: SID 231 SPN: 639 FMI: 13 SAE J1939 Multiplexing Configuration Error – Out of Calibration. The ECM expected information from a multiplexed device but only received a portion of the necessary information.

Cummins ISB CM850 (2003-06) Fault Code: 285 PID: SID 231 SPN: 639 FMI: 9 SAE J1939 Multiplexing PGN Timeout Error – Abnormal Update Rate. The Cummins? ECM did not receive a multiplexed message from an OEM VECU or SIM within the time limit or did not receive it at all.

Cummins ISB CM850 (2003-06) Fault Code: 284 PID: SID 221 SPN: 1043 FMI: 4 Engine Speed/Position Sensor (Crankshaft) Supply Voltage Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected on the ECM voltage supply line to engine speed sensor.

Cummins ISB CM850 (2003-06) Fault Code: 281 PID: SID 126 SPN: 1347 FMI: 7 Fuel Pump Pressurizing Assembly 1 – Mechanical System Not Responding Properly or Out of Adjustment. A pumping imbalance between the front and rear pumping plungers has been detected.

Cummins ISB CM850 (2003-06) Fault Code: 275 PID: SID 126 SPN: 1347 FMI: 7 Fuel Pumping Element Number 1 (Front) – Mechanical System Not Responding Properly or Out of Adjustment.

Cummins ISB CM850 (2003-06) Fault Code: 272 (ISC – Auto) PID: SID 126 SPN: 1347 FMI: 3 High Fuel Pressure Solenoid Valve Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the fuel pump actuator circuit.

WARNING!