Cummins fault code 2756
Cruise Control (Resistive) #2 Signal Circuit: circuit voltage low / shorted low
What it means
Cummins' description: Cruise Control (Resistive) #2 Signal Circuit - Voltage below normal, or shorted to low source.
SPN 520332 is Cruise Control. FMI 4 means the voltage on the circuit is lower than possible for a good sensor, usually a short to ground, a damaged harness, or a failed sensor.
The accelerator pedal has position sensors and an idle validation switch so the ECM knows exactly what the driver is asking for. Cruise control, brake and clutch switches, PTO and vehicle speed inputs are also monitored.
What the lamp means
An amber (yellow) warning lamp means the engine can usually keep running, but the fault should be repaired soon, ideally the same day.
Green, yellow, red: three ways this can look
The same code can be a quick fix or a reason to shut down. Match your situation to the closest example.
Keep an eye on it
A pedal or switch code that set once and cleared, and the pedal works normally.
Schedule a repair
Cruise doesn't work, the pedal feels dead in spots, or the code keeps returning. Have the pedal or switch checked.
Stop and get help
Engine stuck at idle or the pedal not responding, especially with a red lamp. Don't drive it in traffic. You won't have reliable throttle.
Common causes
FMI 4 is an electrical or signal fault, so start with the circuit:
- Accelerator pedal sensor worn or failed
- Pedal connector corroded or loose
- Brake, clutch or cruise switch out of adjustment or failed
- Vehicle speed sensor or wiring fault
If the circuit checks out, the reading may be real. Other possibilities: pedal sensors disagreeing with each other; switch inputs that don't make sense together, like brake and throttle at once.
What you can check before calling
- Check whether the engine stays at idle no matter what you do with the pedal
- Look at the pedal connector under the dash
- Check whether cruise control works
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
Cummins uses the same fault code numbers across its electronic engines, including on-highway models like the ISB/B6.7, ISL/L9 and ISX/X15, though not every code applies to every engine or software level. Source: Cummins Tier 4 Fault Codes. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Same SPN, other failure types
Related Accelerator pedal and driver controls codes
- 2721 SPN 599 FMI 2
Cruise Control Set Switch: erratic or intermittent signal - 2998 SPN 1632 FMI 14
Engine Torque Limit Feature: special instructions - 3186 SPN 1623 FMI 9
Tachograph Output Shaft Speed: abnormal update rate - 3326 SPN 91 FMI 9
SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System: abnormal update rate - 3328 SPN 191 FMI 9
Transmission Output Shaft Speed: abnormal update rate - 3374 SPN 1818 FMI 31
Roll Over Protection Brake Control Active: condition exists
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does Cummins fault code 2756 mean?
Cummins fault code 2756 is J1939 SPN 520332 FMI 4: Cruise Control (Resistive) #2 Signal Circuit - Voltage below normal, or shorted to low source. In plain terms: cruise control (resistive) #2 signal circuit: circuit voltage low / shorted low.
Can I keep driving with Cummins code 2756?
Usually for a short time, if the engine runs normally and no other warnings are on. Get it diagnosed soon, because many amber codes lead to a derate if ignored. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 2756?
SPN 520332 identifies the part or system (Cruise Control). FMI 4 describes the type of failure: circuit voltage low / shorted low.
What usually causes Cummins code 2756?
The most common causes are: accelerator pedal sensor worn or failed; pedal connector corroded or loose; brake, clutch or cruise switch out of adjustment or failed.
Diesel down in the Midlands?
We work on Cummins-powered pickups, vans and medium-duty trucks across Lexington, Columbia and the Midlands, on site at your yard or roadside.