DiagnosticsHigh severity

Bobcat M1403 (14-03) Fault Code: Fuel Pull Output Error Off

Also shown on the panel as 14-03 · Also called Fuel Pull Solenoid Error Off

Fuel Pull Output Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13

TL;DR

M1403, shown as 14-03 on the panel, sets when the gateway controller commands the fuel pull output on wire 8110 but does not see voltage return on that circuit. This stops the fuel pull relay from energizing wire 8100, so the engine will crank but will not start.

High severity. The machine will crank but not start, so it is a no-run condition rather than a slow degradation. It will not damage the engine by itself, but it takes the machine out of service until fixed.

What does Bobcat error code M1403 mean?

M1403 is a fuel pull output circuit fault. The gateway controller sends a command on wire 8110 to energize the fuel pull relay. That relay is supposed to send high current on wire 8100 to actually pull fuel and allow a start. When the controller commands wire 8110 on but does not detect voltage there, it sets M1403.

Because the fuel pull relay never gets its energizing signal correctly, the engine will crank normally on the starter but will not start, since fuel delivery through the pull circuit does not happen.

This is strictly an electrical control circuit issue tied to the fuel pull relay circuit, not a fuel quality, injector, or mechanical fuel system problem.

Common causes of M1403

Controller output wire 8110 shorted to ground
Failed fuel pull relay
Failed gateway controller
Moisture, corrosion, or pushed-back pins in the gateway controller connector, fuel pull relay connectors, or the mainframe harness
Intermittent fault from loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems, which may not be found if not active at the time of testing

How to troubleshoot Bobcat M1403: first checks

Confirm the conditions for the code are present: key switch in run/enter position on and a start command given
Inspect the gateway controller connector, fuel pull relay connectors, and mainframe harness connectors for moisture, corrosion, or pushed-back pins
Check wire 8110 for a short to ground between the gateway controller and the fuel pull relay
Test the fuel pull relay itself for proper operation
If the code is not currently active, treat it as intermittent and focus on loose connections, corrosion, and pushed-back pins as the likely causes, since the exact fault location may not be confirmable at that moment

How the code clears

Cycle power to clear the code once the repair is complete. No separate clearing step is listed beyond cycling power.

Affected models and serial ranges

M1403 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

Safety-critical: confirm before use

Electrical safety: stop the engine before inspecting wiring, fuses, connectors, or drive belts, and avoid shorting power terminals. Thresholds, component locations, wire numbers, fuse locations, and reset procedures can vary by model, configuration, and serial number. Confirm them in the service documentation for your exact machine.

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Frequently asked questions

What does Bobcat code M1403 mean?

It means the gateway controller commanded the fuel pull output on wire 8110 but did not detect voltage on that wire, so the fuel pull relay did not energize as expected.

Why does my Bobcat crank but not start with code M1403?

Because the fuel pull relay is not being energized correctly through wire 8110, the high current pull wire 8100 does not activate, so the engine turns over on the starter but does not get the fuel pull signal needed to start.

What is the numeric panel code for M1403?

On the panel display it appears as 14-03.

What usually causes M1403 on Bobcat skid steers and track loaders?

The listed causes are a short to ground on wire 8110, a failed fuel pull relay, a failed gateway controller, or moisture, corrosion, or pushed-back pins in the gateway controller connector, fuel pull relay connectors, or mainframe harness.

How do I clear M1403 after fixing it?

Cycle the key power off and back on. No other clearing procedure is listed.

Which Bobcat models can show code M1403?

It applies to S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770, T870 models.

What if M1403 is intermittent and not active when I test it?

If the code is not on at the time of testing, the exact cause may not be found right away. Likely suspects still include loose connections, corrosion, pushed-back pins, the controller, or the wire harness, individually or in combination.