Bobcat A8605 (86-05) Fault Code: ACD/RACD Output “G” Short to Battery
Also shown on the panel as 86-05 · Also called ACD Output ‘G’ Short to Battery
ACD/RACD Output “G” Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-21
TL;DR
Bobcat fault code A8605 (panel display 86-05) means the ACD/RACD controller detected voltage on output "G", controller pin J1 B-4, when the controller had not commanded that output on. This is a signal-high condition caused by an unwanted voltage source reaching the output circuit. When it sets, the controller disables output "G".
Medium severity. Output "G" is disabled once the code sets, which will disable whatever attachment function that output controls, but it does not by itself indicate an immediate safety emergency. Treat it as a diagnose-this-shift issue rather than a stop-work-now emergency, unless the disabled function is needed for safe operation of an attachment.
What does Bobcat error code A8605 mean?
A code A8605 occurs when the ACD (Attachment Control Device) or RACD (Remote Attachment Control Device) controller detects voltage present on output "G", at controller pin J1 B-4, while the controller itself has not commanded that output to be active. In plain terms, the controller is seeing voltage on a circuit it expects to be off, which points to an outside voltage source leaking or shorting into that wire rather than a normal commanded signal.
Because the controller cannot trust a circuit that shows voltage when it should be silent, it shuts output "G" off completely to protect the solenoid and wiring until the fault is fixed. Any attachment function wired to output "G" will not work while the code is active.
This code affects the ACD/RACD system used across a wide range of Bobcat skid-steer, track loader, and compact excavator models, wherever an attachment control output "G" circuit is present.
Common causes of A8605
- Output "G" wiring at controller pin J1 B-4 is shorted to battery voltage, meaning the signal wire has picked up an unwanted power feed somewhere in the harness.
- The output "G" solenoid itself has an internal short that is feeding battery voltage back into the control wire.
- A fault inside the ACD/RACD controller is causing it to read voltage on this output when none should be present.
- Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, the mainframe harness, the attachment control harness, or the output "G" solenoid connector are allowing voltage to cross into the signal circuit.
- The code is intermittent and not active at the time of testing. In this case the cause may not be found right away, and probable culprits include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or some combination of these.
How to troubleshoot Bobcat A8605: first checks
- With the key switch or run/enter switch on, check for stored or active codes and note whether A8605 is currently active or was only logged historically, since intermittent faults need different handling.
- Inspect the output "G" solenoid connector and the ACD/RACD controller connectors for moisture, corrosion, or pins that have been pushed back out of their seats. These connector problems are explicitly listed as a cause and are often the fastest fix.
- With the harness disconnected from the solenoid, check controller pin J1 B-4 and the output "G" wire for an unwanted short to battery voltage, tracing the wire through the mainframe harness and attachment control harness for chafe points or pinches against a powered circuit.
- Check the output "G" solenoid itself for an internal short that could be feeding voltage back into the signal wire, since a bad solenoid can mimic a wiring short.
- If no fault is found and the code was intermittent, wiggle-test the harness and connectors at the controller, mainframe, and attachment harness while watching for the code to reappear, since loose or corroded connections are a common intermittent cause.
How the code clears
Once the wiring, solenoid, or controller fault causing the short to battery is repaired, cycle the key power off and back on. Cycling power is the only clearing step listed for this code, and there is no separate reset procedure beyond that.
Affected models and serial ranges
A8605 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 A8605 mean?
It means the ACD/RACD controller found voltage present on output "G" (controller pin J1 B-4) when it had not commanded that output on, so it disabled output "G" until the short-to-battery condition is fixed.
Will my attachment stop working with code A8605 active?
Yes. Whatever attachment function is wired through output "G" will not operate while the code is active, because the controller disables that output as a protective measure.
How do I clear code A8605 after I fix it?
Cycle the key power off and back on. No separate reset procedure is listed beyond cycling power.
What is the difference between A8605 and A8606?
A8605 is a short to battery on output "G", meaning unwanted voltage is present on the circuit. A8606 is the opposite failure mode: a short to ground on the same output "G" circuit. The wiring checks differ because you are hunting for a power-feed short with A8605 and a ground-fault short with A8606.
How is A8605 different from A8607 open circuit?
A8605 sets when the controller sees unexpected voltage on output "G". A8607 sets when the circuit is open, meaning no continuity at all, such as a broken wire or disconnected connector. These require different diagnostic approaches: voltage tracing for A8605 versus continuity testing for A8607.
Can a bad connector really cause a short-to-battery code?
Yes. Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, mainframe harness, attachment control harness, or the output "G" solenoid connector are all listed causes, since corrosion or crossed pins can bridge the signal wire to a powered circuit.
Why can't the technician find the cause of my intermittent A8605 code?
If the code is not active at the time of testing, the short-to-battery condition may not be present at that moment, so it cannot be measured. Intermittent causes commonly include loose connections, corrosion, pushed-back pins, controller issues, or harness problems, sometimes in combination, which makes them hard to isolate on a single test.