Cummins fault code 496
Engine Speed/Position Sensor #2 (Camshaft) Supply Voltage: root cause not known
What it means
Cummins' description: Engine Speed/Position Sensor #2 (Camshaft) Supply Voltage.
SPN 1043 is Engine Speed/Position Sensor #2 (Camshaft) Supply Voltage. FMI 11 means the ECM detected a fault in this system but can't pin down the exact type. Further testing is needed.
The crank and cam position sensors tell the ECM exactly where each piston is so it can time fuel injection. Losing one causes rough running; losing both usually stops the engine.
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
One sensor code that set briefly and cleared, with the engine starting and running normally.
Schedule a repair
Long cranking, occasional stalling, or the code returns. Replace the sensor soon. These usually fail completely without much warning.
Stop and get help
Engine stalls or won't start, or a stop lamp with lost speed signals. Don't plan on driving it until it's fixed.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Real engine overspeed from downhill or a missed shift
- Signal noise from aftermarket electrical add-ons
What you can check before calling
- Note any stalling, hard starting, or rough running
- Look at the sensor connectors for oil or damage
- Think about whether any electrical work was done recently
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: Diagnostic Fault Codes for Cummins Engines. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Same SPN, other failure types
- 283 SPN 1043 FMI 3
Engine Speed/Position Sensor #1 (Crankshaft) Supply Voltage Circuit: circuit voltage high / shorted high - 284 SPN 1043 FMI 4
Engine Speed/Position Sensor #1 (Crankshaft) Supply Voltage Circuit: circuit voltage low / shorted low - 387 SPN 1043 FMI 3
Accelerator Pedal Position Sensor Supply Voltage Circuit: circuit voltage high / shorted high - 443 SPN 1043 FMI 4
Accelerator Pedal Position Sensor Supply Voltage Circuit: circuit voltage low / shorted low
Related Engine speed and position sensors codes
- 497 SPN 1377 FMI 2
Multiple Unit Synchronization Switch: erratic or intermittent signal - 523 SPN 611 FMI 2
Auxiliary Intermediate (PTO) Speed Switch Validation: erratic or intermittent signal - 689 SPN 190 FMI 2
Engine Crankshaft Speed/Position: erratic or intermittent signal - 731 SPN 723 FMI 7
Engine Speed / Position Camshaft and Crankshaft Misalignment: not responding / out of adjustment - 753 SPN 723 FMI 2
Engine Speed/Position #2: erratic or intermittent signal - 234 SPN 190 FMI 0
Engine Crankshaft Speed/Position: reading above normal (most severe)
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 496 mean?
Cummins fault code 496 is J1939 SPN 1043 FMI 11: Engine Speed/Position Sensor #2 (Camshaft) Supply Voltage. In plain terms: engine speed/position sensor #2 (camshaft) supply voltage: root cause not known.
Can I keep driving with Cummins code 496?
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 496?
SPN 1043 identifies the part or system (Engine Speed/Position Sensor #2 (Camshaft) Supply Voltage). FMI 11 describes the type of failure: root cause not known.
What usually causes Cummins code 496?
The most common causes are: real engine overspeed from downhill or a missed shift; signal noise from aftermarket electrical add-ons.
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.