Cummins Fault Code

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131 (SPN 91 FMI 3)

Engine stuck at idle; No throttle response; Red Stop Lamp may be active.

System

Not specified

Symptom

Engine stuck at idle; No throttle response; Red Stop Lamp may be active.

Diagnosis & fix steps

Accelerator Pedal Position Sensor 1 - Voltage High. LOGIC: Signal > 4.5V. Usually caused by an open return wire or a short between the 5V supply and signal wire. ACTION: 1. Check the 6-pin pedal connector for moisture/dirt. 2. Monitor pedal percentage on a scanner while flexing the harness near the bulkhead. FIX: Replace Accelerator Pedal Assembly or repair wiring in the OEM cab harness.

Red Seal field insights

Pedal Sync: Many Cummins pedals have two sensors. If 131 is active but 132 is not, the ECM will ignore the pedal entirely for safety. Check the floor mat—it often holds moisture that corrodes these pins.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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