Cummins fault code 2186 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags the Sensor Supply 4 Circuit – Voltage Below Normal, or Shorted to Low Source condition (PID S232, SPN 3512, FMI 4/4, Amber lamp). This 4-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 2186 overview
Cummins identifies this code as “Sensor Supply 4 Circuit – Voltage Below Normal, or Shorted to Low Source” on the Accelerator Pedal Position Sensor Supply Voltage. Sensor supply 4 of the electronic control module (ECM) provides a 5 volt supply to the accelerator pedal position sensor. The accelerator position sensor is a potentiometer attached to the accelerator pedal. The accelerator position sensor varies the signal voltage to the ECM as the accelerator pedal is depressed and released. Low signal voltage is received by the ECM when the accelerator pedal is at 0 percent. A high signal voltage is received by the ECM when the accelerator pedal position 5-volt supply, accelerator pedal position return, and accelerator pedal position signal.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Accelerator Pedal Position Sensor Supply Voltage — ISM CM871 fault codes |
| Fault code | 2186 (SPN 3512, FMI 4/4) |
| PID | S232 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 2186. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before replacing parts. Full specifications are published on the Cummins official website.
Who needs this Cummins fault code 2186 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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