Cummins ISL CM850 (2003-06) Fault Code: 1639 PID: SID 51 SPN: 703 FMI: 11 Auxiliary Equipment Sensor Input Number 3 (OEM Switch) – Root Cause Not Known.
Cummins ISL CM850 (2003-06) Fault Code: 1639 PID: SID 51 SPN: 703 FMI: 11 Auxiliary Equipment Sensor Input Number 3 (OEM Switch) – Root Cause Not Known.
This fault code is activated when the maximum inlet temperature or inlet pressure of a third party after-treatment system has exceeded the maximum allowable limits. A power derate may or may not be associated with this fault code.
Possible repairs:
1)Replace the ECM.
2)Repalce the OEM harness.
![International Truck ISIS - Oncommand Service Information Q4.2020 [04.2020]](https://www.ecuforcetruck.com/wp-content/uploads/2022/01/OnCommand-2020-1-300x300.png)
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