Bobcat A8306 (83-06) Fault Code: ACD/RACD Output “D” Short to Ground
Also shown on the panel as 83-06 · Also called ACD Output ‘D’ Short to Ground, ACD/RACD Output “D” Short to Ground
ACD/RACD Output “D” Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat code A8306 (panel form 83-06) sets when the ACD/RACD controller commands output "D" but does not detect voltage on controller pin J1 B-25 or its return wire on pin J1 A-27. When this happens the controller disables output "D" until the fault is cleared.
Medium severity. Output "D" is disabled while this code is active, which removes function from whatever attachment or auxiliary circuit that output controls. It will not damage the machine on its own, but it should be diagnosed before relying on that attachment function again.
What does Bobcat error code A8306 mean?
A8306 is set by the Attachment Control Device (ACD) or Remote Attachment Control Device (RACD) controller. This controller manages powered attachments connected to the machine, and output "D" is one of its solenoid driver circuits.
The controller expects to see voltage on output "D" (controller pin J1 B-25) and on its return wire (controller pin J1 A-27) whenever it commands that output on. If it does not see that voltage, it concludes the circuit is shorted to ground and shuts output "D" down to protect the wiring and solenoid.
This is strictly an electrical fault code tied to one output circuit. It affects only the function driven by output "D" and does not by itself indicate a hydraulic or engine problem, though the attachment fed by that output may stop working.
Common causes of A8306
- Output "D" wire (controller pin J1 B-25) or its return wire (controller pin J1 A-27) shorted to ground
- Output "D" solenoid has failed or is drawing the circuit to ground
- Fault inside the ACD/RACD controller itself
- Moisture, corrosion, or pushed back pins in the ACD/RACD controller connectors, mainframe harness, attachment control harness, or the output "D" solenoid connector
- Intermittent short from loose connections, corrosion, pushed back pins, the controller, or the wire harness, in any combination, that may not be present at the time of testing
How to troubleshoot Bobcat A8306: first checks
- Confirm the key switch is in run/enter position, since this is required for the code to be active for testing
- Inspect the ACD/RACD controller connectors for moisture, corrosion, or pushed back pins
- Trace the output "D" wire at controller pin J1 B-25 and the return wire at controller pin J1 A-27 for chafing, pinched insulation, or contact with ground
- Check the mainframe harness and attachment control harness along the routing to the output "D" solenoid for damage or exposed wire
- Inspect the output "D" solenoid and its connector for internal short or water intrusion
- If the code will not stay active, treat it as intermittent and recheck all connectors and harness sections for loose pins or corrosion since the fault may not show up during static testing
How the code clears
Once the short to ground has been repaired, clear code A8306 by cycling key power off and back on. No separate clearing procedure or reset command is listed for this code.
Affected models and serial ranges
A8306 appears in our records across 20 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| E35 | SN A93K110001-99999, SN AC2P11001-99999 |
| E42 | SN AG3411001-99999 |
| E45 | SN AG3G11001-99999, SN AHHC11001-99999 |
| E55 | SN ARWM11001-99999, SN ASW311001-99999 |
| 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 A3NT10001-12369, 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 A8306 mean?
It means the ACD/RACD controller commanded output "D" on but did not see the expected voltage on that output circuit or its return wire, so it assumes a short to ground and disables output "D".
What is the numeric panel code for A8306?
On machines that display numeric panel codes, A8306 shows as 83-06.
Will my attachment stop working with this code?
Yes, whatever function is wired to output "D" on the ACD/RACD controller will be disabled while the code is active, since the controller shuts that output down to protect the circuit.
Which Bobcat machines can show A8306?
This code applies to E35, E42, E45, E55, S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 and T870 models equipped with ACD/RACD controllers.
How do I clear code A8306 after repair?
Cycle key power off and back on. No other reset step is listed.
Why does the code come and go instead of staying on?
Intermittent shorts caused by loose connections, corrosion, or pushed back pins in the controller connectors or harness may not be present during every key cycle, so the code can set and clear without a permanent fault being found right away.
Is A8306 a hydraulic or electrical problem?
It is an electrical fault in the ACD/RACD controller's output "D" circuit, not a hydraulic pressure or flow fault, even though the output may control a hydraulically-actuated attachment function.