Bobcat A8205 (82-05) Fault Code: ACD/RACD Output “C” Short to Battery
Also shown on the panel as 82-05 · Also called ACD Output ‘C’ Short to Battery, ACD/RACD Output “C” Short to Battery
ACD/RACD Output “C” Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8205 (panel display 82-05) sets when the ACD/RACD controller sees voltage on Output "C" (controller pin J1 B-13) when that output has not been commanded on. The controller disables Output "C" as a protective response until the fault is cleared.
Medium severity. The affected attachment output is disabled until the fault is resolved, which stops that function from working, but the code alone does not indicate an immediate risk to the machine's core drive, engine, or lifting systems. Treat it as a diagnose-this-shift item, especially if you depend on the attachment circuit for daily work.
What does Bobcat error code A8205 mean?
A8205 is set by the Advanced Control Display / Rear Attachment Control Display (ACD/RACD) controller when it detects voltage present on Output "C", which lives on controller pin J1 B-13, at a time when the controller itself has not commanded that output active. In plain terms, the controller expects this circuit to be dead unless it turns it on, and it is seeing voltage anyway.
This condition points to unwanted voltage getting into the Output "C" circuit, most commonly from a short to battery voltage somewhere in the wiring, the solenoid it drives, or inside the controller itself. Because the controller cannot trust the signal, it shuts Output "C" down so the attachment function it controls does not activate unexpectedly.
This is an attachment control circuit fault, not a core hydraulic charge or engine fault. It affects whatever function is wired to ACD/RACD Output "C", which will not operate correctly until the short is found and cleared.
Common causes of A8205
- Output "C" wiring, controller pin J1 B-13, shorted to battery voltage.
- Return wire, controller pin J1 A-1, shorted to battery voltage.
- Faulty Output "C" 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 "C" solenoid connector.
- Intermittent fault: if the code is not active at the time of testing, the cause may not be found immediately. Probable causes for intermittent faults include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these.
How to troubleshoot Bobcat A8205: first checks
- With the key switch / run-enter on, check for the A8205 code and confirm whether it is active now or stored/intermittent, since intermittent faults are harder to isolate.
- Inspect the ACD/RACD controller connectors, mainframe harness connectors, and attachment control harness connectors for moisture, corrosion, or pushed-back pins, paying close attention to pin J1 B-13 (Output "C") and pin J1 A-1 (return wire).
- Check the wiring for pin J1 B-13 and the return wire at J1 A-1 for a short to battery voltage using a meter, with the harness disconnected from the controller to isolate the circuit from the controller itself.
- Inspect the Output "C" solenoid and its wiring and connector for damage, corrosion, or a short condition.
- If wiring and solenoid check out clean, suspect the ACD/RACD controller itself as the source of the false voltage reading.
How the code clears
Cycle power (turn the key switch off, then back on) after the repair is complete. No separate clearing procedure beyond a power cycle is listed for this code.
Affected models and serial ranges
A8205 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 A8205 mean?
It means the ACD/RACD controller detected voltage on Output "C" (controller pin J1 B-13) when it did not command that output on. The controller disables Output "C" until the issue is fixed.
What is the panel display number for A8205?
On the display panel this code shows as 82-05.
Which Bobcat machines can show code A8205?
It applies across a range of Bobcat compact excavators and loaders, including the E35, E42, E45, E55, S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 models, plus the T870.
Will A8205 stop my attachment from working?
Yes. Once the code sets, the controller disables Output "C", so whatever attachment function is wired to that output will not operate until the short is repaired.
How do I clear code A8205 after I fix it?
Cycle the key switch power off and back on. No other clearing procedure is listed for this code.
Why does A8205 keep coming and going?
An intermittent A8205 usually points to a loose connection, corrosion, or a pushed-back pin somewhere in the ACD/RACD controller connectors or harness rather than a constant hard short. If the code is not active when you test, the cause may not be found on the first attempt.
Is A8205 a safety-critical fault?
It is an electrical control circuit fault tied to an attachment output rather than to engine, brake, or lifting safety systems directly. Still, do not ignore it, since an unexplained short to battery voltage in the harness can affect other circuits over time.