Cummins fault code 1242 is the official Cummins troubleshooting manual for the Accelerator Pedal or Lever Position Sensor 1 and 2 fault on ISX11.9 CM2250 engines. This 14-page PDF documents SPN 91, FMI 2, and the red-lamp response, and it walks through the circuit description, the guided diagnostic steps, and the exact conditions for setting and clearing the code. Accelerator pedal or lever position sensors 1 and 2 supply the ECM with driver demand. When the two signals disagree, the ECM flags erratic, intermittent, or incorrect data and lights the red stop lamp.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 and ISX12 CM2250 (2010–2012) |
| System / Group | Diagnostic Trouble Codes (DTCs) — Accelerator Pedal or Lever Position Sensor |
| Fault code | 1242 (SPN 91, FMI 2) |
| Fault description | Accelerator Pedal or Lever Position Sensor 1 and 2 — Data Erratic, Intermittent, or Incorrect |
| Warning lamp | Red |
| Reference | Cummins INSITE service tool; Procedure 019-032 (ECM Calibration Code) |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Cummins fault code 1242 table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting fault code 1242
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk service notes
- Guided troubleshooting steps and associated procedures
Applicable truck models and engines
This document applies to Cummins ISX11.9 CM2250 and ISX12 CM2250 engines from the 2010–2012 range fitted in heavy-duty on-highway trucks. The SPN 91 / FMI 2 definition and the guided steps follow the same fault-code logic Cummins publishes for its CM2250 platform, so always confirm the ECM calibration on the vehicle against the current revision using the Cummins INSITE electronic service tool. Verify engine coverage on the Cummins official website before ordering parts.
Who needs this Cummins fault code 1242 manual
Any technician or workshop owner diagnosing Cummins fault code 1242 on an ISX11.9 CM2250 engine needs this procedure to work through the fault correctly. A red-lamp accelerator fault affects driveability, so the manual checks the sensor supply, return, and both signal circuits for intermittent connections. The manual ends with the associated-procedures table and the “Reset All Faults” clearing steps so the repair can be validated.
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