Bobcat M3304 (33-04) Fault Code: Deluxe Panel No Communication
Also shown on the panel as 33-04
Deluxe Panel No Communication · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat code M3304, panel form 33-04, sets when the gateway controller loses CAN communication with the deluxe panel. It can also appear if a deluxe panel was swapped to a standard panel without doing the proper downgrade procedure. It sets with the key switch in run/enter and clears by cycling power once the fault is fixed.
Medium severity. M3304 does not directly damage the machine, but losing the deluxe panel display means you lose visibility into machine status, other active codes, and settings. Diagnose it before relying on the panel for machine monitoring, and treat any driving or lifting decisions with extra caution until the display is restored.
What does Bobcat error code M3304 mean?
Bobcat's gateway controller and the deluxe panel talk to each other over a CAN (Controller Area Network) communication bus. M3304 sets when the gateway controller stops hearing from the deluxe panel on that bus.
This is a communication fault, not a fault with a specific sensor or hydraulic function. It usually points to a wiring, power, ground, fuse, panel, or gateway controller problem somewhere in the CAN network or its supporting circuits.
Bobcat also notes this code can appear simply because a deluxe panel was switched out for a standard panel without going through the correct downgrade procedure. That's a configuration mismatch, not a wiring failure, so it's worth ruling out first.
Common causes of M3304
- Panel switched from a deluxe panel to a standard panel without being downgraded properly
- Blown FRC1 fuse (listed as fuse 4 or fuse 6 depending on model/version) or blown fuse 6
- CAN communication wire 91xx/95xx shorted to supply voltage, shorted to ground, or open
- CAN communication wire 92xx/96xx shorted to supply voltage, shorted to ground, or open
- Switched power wire 1590 open, or ground wire 2250 open
- Fault in the left hand panel
- Fault in the right hand panel
- Fault in the gateway controller itself
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, left hand panel connectors, right hand panel connector, mainframe harness, or cab harness
- Intermittent condition: if the code isn't active during testing, the cause may not be found right away. Probable causes still include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these
How to troubleshoot Bobcat M3304: first checks
- Confirm whether a panel swap was recently done. If a deluxe panel was replaced with a standard panel, verify the downgrade procedure was completed correctly before chasing wiring
- Check FRC1 fuse 4 or fuse 6 (labeling varies by model/version) and fuse 6 for continuity, replace if blown
- Inspect the CAN communication wires (91xx/95xx and 92xx/96xx circuits) for shorts to supply voltage, shorts to ground, or open circuits
- Check switched power wire 1590 and ground wire 2250 for continuity and a solid connection
- Inspect connectors at the gateway controller, left hand panel, right hand panel, mainframe harness, and cab harness for moisture, corrosion, or pushed-back pins
- If the code is not currently active, treat it as intermittent: wiggle-test harness connectors and recheck connections since the fault may not reproduce on demand
How the code clears
Cycle power (turn the key switch off, then back to run/enter) once the repair is complete. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
M3304 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 M3304 mean?
It means the gateway controller cannot communicate with the deluxe panel over the CAN network. It can also show up after a deluxe panel was replaced with a standard panel without the correct downgrade procedure.
What is the panel display number for M3304?
On the panel, M3304 shows as 33-04.
Can M3304 set just from swapping panels?
Yes. Bobcat lists switching from a deluxe panel to a standard panel without properly downgrading it as one of the possible causes, separate from any wiring fault.
Will a blown fuse cause M3304?
Yes, a blown FRC1 fuse (listed as fuse 4 or fuse 6 depending on the model and documentation version) or a blown fuse 6 is a listed cause.
How do I clear M3304 after repair?
Cycle the key switch power off and back to run/enter. No other clearing procedure is listed.
Why does M3304 come and go instead of staying on?
Bobcat notes that if the code isn't active at the time of testing, the cause may be intermittent, such as loose connections, corrosion, or pushed-back pins in a connector, and may take more than one inspection to find.
Which machines can show code M3304?
It applies to Bobcat S510, S530, S550, S570, S590, S630, S650, S750, S770 skid steers and T550, T590, T630, T650, T750, T770, T870 compact track loaders equipped with a deluxe panel and gateway controller.