Bobcat A8303 (83-03) Fault Code: ACD/RACD Output "D" Error Off
Also shown on the panel as 83-03 · Also called ACD Output ‘D’ Error Off
ACD/RACD Output "D" Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8303 (panel display 83-03) sets when the Bobcat ACD/RACD controller sends voltage to energize the attachment solenoid coil on output "D" (wire 5150) but detects no voltage return, or shuts the output off after sensing a large current draw. The ACD/RACD icon on the right instrument panel will blink, and the attachment on output "D" will stop working.
Medium severity. The affected attachment output will not function until this is fixed, which can stop attachment-dependent work, but it does not by itself indicate an immediate safety emergency or engine/drivetrain damage risk.
What does Bobcat error code A8303 mean?
A8303 is set by the Bobcat Advanced Control Display / Remote Advanced Control Display (ACD/RACD) controller. This controller manages power to attachment solenoids through several outputs, one of which is output "D", wired through wire 5150 to the attachment solenoid coil.
When the controller commands output "D" on, it expects to see voltage return confirming the circuit is intact and the solenoid coil is drawing normal current. If it detects no voltage on that output, or if it senses a large current draw and shuts the output off to protect itself and the wiring, it logs A8303 and blinks the ACD/RACD icon on the right instrument panel.
In practical terms, this means the attachment function wired to output "D" will not work until the fault is found and cleared. This is most often an electrical circuit or coil problem rather than a hydraulic or mechanical one.
Common causes of A8303
- Shorted solenoid coil on the attachment connected to output "D".
- Circuit output "D" wire 5150 to the attachment solenoid shorted to ground.
- Fault internal to the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
- Intermittent causes that may not be found during a single test session, including loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat A8303: first checks
- With key switch in run/enter (on), check for the blinking ACD/RACD icon on the right instrument panel to confirm the code is currently active.
- Inspect the attachment solenoid coil for signs of a short, and check its resistance/condition if you have the means to do so.
- Trace wire 5150 from the ACD/RACD controller to the attachment solenoid, looking for chafing, pinched insulation, or a short to ground along the mainframe and attachment control harness.
- Disconnect and inspect the mainframe and attachment control harness connectors for moisture, corrosion, or pins that have pushed back out of their connector bodies.
- If the code is not active during testing, treat it as intermittent and recheck all connections, harness routing, and connector pins rather than assuming no problem exists.
- If wiring, connectors, and the solenoid coil all check out, suspect the ACD/RACD controller itself.
How the code clears
Cycle power to clear the code once the repair is complete. No separate clearing step is listed.
Affected models and serial ranges
A8303 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 ATZC11001-99999 |
| 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 A39511001-99999, 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 |
Frequently asked questions
What does Bobcat code A8303 mean?
It means the ACD/RACD controller sent voltage to energize the attachment solenoid coil on output "D" (wire 5150) but detected no voltage return, or shut the output off after sensing a large current draw. The attachment wired to that output will not work and the ACD/RACD icon on the right instrument panel will blink.
What is the panel display number for A8303?
The numeric panel form is 83-03.
Will my attachment work with A8303 active?
No. When this code is active, the attachment function connected to output "D" will not operate because the controller has shut off or lost that output.
What usually causes A8303?
The most common causes are a shorted solenoid coil, wire 5150 shorted to ground between the controller and the solenoid, moisture or corrosion or pushed-back pins in the mainframe or attachment control harness connectors, or a fault in the ACD/RACD controller itself.
How do I clear A8303 after repair?
Cycle power to the machine once the repair is complete. No separate clearing procedure is listed beyond that.
What if the code doesn't show up when I test it?
Treat it as intermittent. Probable causes for intermittent A8303 include loose connections, corrosion, pushed-back pins, the wire harness, or the controller, alone or in combination, and the root cause may not be found in a single test session.
Which Bobcat models can show A8303?
It applies across the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 model lines.