Home › Cummins Engines › 1239
Cummins Engines · 1239
Accelerator Pedal Position Sensor 2 Circuit High
What this code means
Accelerator Pedal or Lever Position Sensor 2 Circuit - Voltage Above Normal or Shorted to High Source
Applies to: ISX CM871 (2007-2010).
Possible causes / checks (from the source)
SPN 2623, FMI 3; Lamp: Amber
Need the part?
If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (1239), machine model and serial number — we quote genuine and OEM replacement parts for export.
Ask for the replacement part on WhatsAppSource: Diesel Service Parts — Cummins ISX CM871 fault code list; cross-checked vs Cummins Engine Fault Code List (Scribd). Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.