Bobcat A8305 (83-05) Fault Code: ACD/RACD Output “D” Short to Battery
Also shown on the panel as 83-05 · Also called ACD Output ‘D’ Short to Battery, ACD/RACD Output “D” Short to Battery
ACD/RACD Output “D” Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8305 (panel form 83-05) sets when the ACD/RACD controller sees voltage on Output "D", controller pin J1 B-25, when the controller has not commanded that output on. When this happens the controller disables Output "D" until the fault is fixed and power is cycled.
Medium severity. Output "D" is disabled once the code sets, so whatever attachment function runs on that output will stop working. It is not an engine-damage or safety-shutdown code by itself, but losing a commanded output on an attachment can affect control of that attachment, so treat it as a diagnose-this-shift issue rather than something to ignore.
What does Bobcat error code A8305 mean?
A8305 is an electrical fault on Bobcat's ACD/RACD (Attachment Control Device / Remote Attachment Control Device) controller. The controller monitors its own outputs, and Output "D" runs through controller pin J1 B-25 to an attachment solenoid. If the controller sees voltage on that output when it did not tell the output to turn on, it flags A8305 and shuts Output "D" off as a protective measure.
In practice this almost always means a wiring or connector problem is feeding stray battery voltage into a circuit that should be off, or a solenoid or the controller itself has an internal fault. Because the controller disables the output when it detects the fault, any attachment function that depends on Output "D" will not operate until the issue is corrected and the code is cleared.
Common causes of A8305
- Output "D" wire at controller pin J1 B-25 shorted to battery voltage
- Return wire at controller pin J1 A-27 shorted to battery voltage
- Faulty Output "D" solenoid
- Faulty ACD/RACD controller
- Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, mainframe harness, attachment control harness, or the Output "D" solenoid connector
- Intermittent condition not present at time of testing, which can come from loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these
How to troubleshoot Bobcat A8305: first checks
- With key switch / run-enter on, check for the code and confirm whether it is active or intermittent
- Inspect the ACD/RACD controller connectors and the mainframe and attachment control harness connectors for moisture, corrosion, or pins pushed back out of their sockets
- Trace the Output "D" wire at controller pin J1 B-25 and the return wire at controller pin J1 A-27 for signs of chafing or contact with a battery-voltage source
- Check the Output "D" solenoid and its wiring for a short to battery voltage
- If everything checks out visually and the code is not active during testing, treat it as intermittent and recheck all connectors and harness sections for loose or corroded connections before suspecting the controller itself
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
A8305 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 A8305 mean?
It means the ACD/RACD controller detected voltage on Output "D" (controller pin J1 B-25) when it had not commanded that output on. The controller responds by disabling Output "D" until the fault is fixed and power is cycled.
What is the panel display number for A8305?
The numeric panel form is 83-05.
Which machines can show code A8305?
It applies across a range of Bobcat excavators and skid steer/track loaders, including the E35, E42, E45, E55, S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 and T870 models.
Will my attachment stop working with this code?
Yes. Once A8305 sets, the controller disables Output "D", so whatever attachment function is wired to that output will not operate until the fault is repaired and the code is cleared.
How do I clear code A8305 after repair?
Cycle power to the machine. No additional clearing procedure is listed.
What if the code doesn't show up when I test the machine?
If A8305 is intermittent and not active during testing, the exact cause may not be found right away. Likely culprits still include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these, so a careful inspection of all related connectors is the best next step.
Can a bad solenoid cause A8305?
Yes, the Output "D" solenoid is listed as a possible cause, either from an internal fault in the solenoid or from moisture or corrosion at its connector.