Bobcat M2403 (24-03) Fault Code: Fuel Pull Relay Error Off
Also shown on the panel as 24-03
Fuel Pull Relay Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M2403 sets when the gateway controller commands the fuel pull relay on but does not see the expected feedback voltage return on wire 3410 or wire 8150, depending on model. This points to a fuse, wiring, relay, or fuel shutoff solenoid problem in the fuel pull circuit. Numeric panel form is 24-03.
High severity. The fuel pull relay controls the fuel shutoff solenoid path that lets fuel reach the engine. A fault here can prevent starting or cause an unexpected shutdown, so it should be diagnosed before returning the machine to regular work.
What does Bobcat error code M2403 mean?
M2403 is a Bobcat gateway controller code tied to the fuel pull relay circuit. When the key switch is on and a start command is given, the controller sends a signal to energize the fuel pull relay. That relay is supposed to pass battery voltage both to the fuel pull solenoid (wire 8100/8120) and back to a feedback wire that the controller monitors, either wire 3410 or wire 8150 depending on the machine and controller version.
If the controller commands the relay on but never sees voltage return on that feedback wire, it logs M2403. In plain terms: the controller told the fuel system to open the path for fuel, but got no confirmation that it actually happened.
Because the fuel pull relay and fuel shutoff solenoid are directly in the path that allows fuel delivery, a fault in this circuit can prevent the engine from starting or running, or can cause it to shut down unexpectedly if the feedback drops out while running.
Common causes of M2403
- FRC1 fuse (referenced as fuse 5 or fuse 10 depending on model/controller variant) blown or not making contact
- Supply wire 1350 open
- Feedback wire 3410 (or 8150 on other variants) shorted to ground or open
- Fuel pull solenoid wire 8100/8120 shorted to ground
- Faulty fuel pull relay
- Faulty fuel shutoff solenoid
- Faulty gateway controller
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, fuel pull relay connectors, or mainframe harness
- Intermittent fault: if the code is not active at the time of testing, the cause may not be found immediately. Probable causes in that case include loose connections, corrosion, pushed-back pins, the controller, the harness, or a combination of these
How to troubleshoot Bobcat M2403: first checks
- Check FRC1 fuse (fuse 5 or fuse 10 depending on your model) for continuity and proper seating in the fuse holder
- Inspect the fuel pull relay and its connector for corrosion, moisture, or pushed-back pins, and confirm it clicks/energizes when commanded
- Trace supply wire 1350 for an open circuit between its source and the relay
- Check feedback wire 3410 or 8150 (whichever applies to your model) for a short to ground or an open, using a multimeter with the key on and a start command given if safe to do so
- Inspect fuel pull solenoid wiring 8100/8120 for a short to ground
- Check the gateway controller connectors and the mainframe harness connectors for moisture, corrosion, or pushed-back terminals
- If the code is intermittent and not currently active, wiggle-test harness connectors in the fuel pull relay and controller area while monitoring for the fault to reappear
How the code clears
Cycle power to the machine (key off, then back on) once the repair is complete. No separate clearing step is listed beyond this power cycle.
Affected models and serial ranges
M2403 appears in our records across 16 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| S510 | SN A3NJ11001-99999, SN A3NK11001-99999, SN ATZC11001-ATZC99999 |
| S530 | SN A7TV11001-99999, SN ATZD11001-99999 |
| S550 | SN A3NK11001-A3NL99999, SN A3NM11001-99999 |
| S570 | SN A7U711001-799999, SN A7U811001-899999 |
| S590 | SN ANMN11001-99999, SN ANMP11001-99999 |
| S630 | SN A3NT12370-99999, SN A3NU11001-11111, SN A3NU11112-99999 |
| S650 | SN A3NV11001-13098, SN A3NV13099-99999, SN A3NW11001-11248, SN A3NW11249-99999 |
| S750 | SN A3P211001-299999 |
| S770 | SN A3P411001-99999 |
| T550 | SN A7UJ11001-AJZV12276 |
| T590 | SN ALJU11001-999999, SN B37811001-999999, SN B3Z711001-999999 |
| T630 | SN A7PU11001-11663, SN A7PU11664-99999 |
| T650 | SN A3P012214-099999, SN A3P111242-199999 |
| T750 | SN ANKA11001-A99999 |
| T770 | SN A3P811001-899999, SN A3P911001-999999 |
| T870 | SN A3PG11001-99999, SN A3PH11001-99999 |
Frequently asked questions
What does Bobcat code M2403 mean?
It means the gateway controller commanded the fuel pull relay on but did not detect the expected feedback voltage returning on wire 3410 or wire 8150, depending on your machine's wiring variant. This suggests a problem somewhere in the fuel pull relay circuit, from the fuse through the relay to the fuel shutoff solenoid.
Will M2403 stop my Bobcat from starting?
It can. The fuel pull relay and fuel shutoff solenoid are part of the circuit that allows fuel to reach the engine, so a fault in this path can prevent starting or cause a shutdown. Treat it as a code to diagnose before relying on the machine for regular work.
Is M2403 the same on every Bobcat model?
The underlying fault is the same, a missing feedback signal on the fuel pull relay, but the specific feedback wire number (3410 versus 8150) and fuse number (fuse 5 versus fuse 10) can differ by model and controller version. Confirm which wiring applies to your specific machine before testing.
What is the first thing to check for M2403?
Start with the FRC1 fuse and the fuel pull relay itself, checking for a blown fuse, corrosion, or a relay that fails to energize when commanded. From there, check the supply wire, the feedback wire, and the solenoid wiring for opens or shorts to ground.
How do I clear M2403 after fixing it?
Cycle the key power off and back on. No additional reset procedure is listed for this code.
Can a bad connector cause M2403 even if the wiring is fine?
Yes. Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the fuel pull relay connectors, or the mainframe harness can all interrupt the feedback signal without an actual wire break, and this is a listed cause.
Why does M2403 come and go instead of staying on?
An intermittent M2403 usually points to a loose connection, corrosion, or a pushed-back pin that only interrupts the circuit under certain conditions like vibration or temperature changes. If the code is not active during testing, it may take a wiggle test on the harness and connectors to reproduce it.