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Bobcat · Controls

Bobcat code M3204: ACS controller no communication

What it means

The main controller isn't getting messages from the ACS/AHC (workgroup) controller, which runs lift and tilt from foot pedals or hand controls. Bobcat excavators use this number for a different fault, so check your machine type.

Can I keep running?

Stop: fix before running

No. Stop the machine safely (bucket or attachment down, engine off) and find the cause before you run it again.

Check first

  1. Park on level ground, lower the lift arms and attachment to the ground, stop the engine and remove the key.
  2. Check battery voltage, then clean and tighten the battery cables and ground straps. Bobcat notes that loose or corroded grounds can set several codes at once.
  3. Check the fuses and relays for that circuit using the fuse decal or the O&M manual.
  4. Inspect the connector and harness at the part named in the code for corrosion, water, rubbed-through insulation or pushed-back pins.
  5. Restart and see if the code comes back. If it does, stop and call your Bobcat dealer.

Likely causes

  • Low battery voltage or bad grounds
  • Blown fuse feeding the ACS controller
  • Loose or damaged connector or harness
  • Failed ACS controller (less common)

The fix

Power, ground and harness repairs fix most cases. A dealer can test the ACS controller and data link if the code persists.

Different code on your screen? Snap the display and Mechy reads it.

Related controls codes

All Bobcat codes

Questions

What does Bobcat code M3204 mean?

ACS controller no communication. The main controller isn't getting messages from the ACS/AHC (workgroup) controller, which runs lift and tilt from foot pedals or hand controls. Bobcat excavators use this number for a different fault, so check your machine type.

Can I keep running with M3204?

No. Stop the machine safely (bucket or attachment down, engine off) and find the cause before you run it again.

How do I fix Bobcat code M3204?

Power, ground and harness repairs fix most cases. A dealer can test the ACS controller and data link if the code persists.

Sources

  1. Bobcat Company, Diagnostic Service Codes list (fault codes PDF, 2020)
  2. Bobcat T450 Operation & Maintenance Manual 7250077 (2018), Diagnostic Service Codes
  3. BigRentz, Full List of Bobcat Fault Codes (searchable table)

Code meanings vary by model, serial range and software. Confirm with your operator's manual or Bobcat dealer before replacing parts.

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