DiagnosticsMedium severity

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

ACD/RACD Output “G” Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13

TL;DR

A8605 (panel display 86-05) sets when the ACD/RACD controller sees voltage on output "G" (controller pin J1 B-4) when the controller is not commanding it on. The controller disables output "G" to protect the circuit until the short is found and repaired.

Medium severity. Output "G" is disabled once this code sets, which will disable whatever attachment function that output controls. The machine can usually still be operated for other work, but the affected attachment function will not work until the short is repaired, so it should be diagnosed before relying on that circuit again.

What does Bobcat error code A8605 mean?

A8605 is set by the ACD/RACD controller, which manages attachment control functions on these Bobcat machines. The controller monitors output "G" at controller pin J1 B-4 and expects that pin to carry voltage only when the controller itself commands it, usually to run a solenoid on an attachment.

When the controller detects voltage present on that output while it has not commanded it, it flags a short to battery condition. Because unwanted voltage on that circuit could operate the attachment function unexpectedly, the controller shuts output "G" down as a protective measure as soon as the fault is detected.

This is an electrical wiring and controller fault, not a hydraulic or engine problem by itself. It affects whatever solenoid or device is wired to output "G" on the attachment control circuit.

Common causes of A8605

Output "G" wiring at controller pin J1 B-4 shorted to battery voltage.
Failed or shorted output "G" solenoid.
Fault internal to the ACD/RACD controller itself.
Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, the mainframe harness, the attachment control harness, or at the output "G" solenoid connector.
Intermittent condition: if the code is not active at the time of testing, the cause may not be found immediately. Probable causes for an intermittent fault include loose connections, corrosion, pushed-back pins, the controller itself, the wire harness, or a combination of these.

How to troubleshoot Bobcat A8605: first checks

Confirm the key switch is in the run/enter position, since this is the condition required for the code to be checked.
Inspect the ACD/RACD controller connectors and the output "G" solenoid connector for moisture, corrosion, or pins that have pushed back out of their connector body.
Trace the wiring from controller pin J1 B-4 through the mainframe harness and attachment control harness to the output "G" solenoid, looking for chafed or pinched wire that could contact a battery-voltage source.
Test the output "G" solenoid itself for an internal short that could be feeding battery voltage back into the signal wire.
If the code is not currently active, wiggle-test connectors and harness sections while watching for the code to reset, since intermittent shorts from loose connections or corrosion may not show up on a static check.
If wiring, connectors, and the solenoid all check out, suspect the ACD/RACD controller itself.

How the code clears

Cycle power to the machine after the repair is complete. No other reset procedure is listed for this code.

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

Safety-critical: confirm before use

Electrical safety: stop the engine before inspecting wiring, fuses, connectors, or drive belts, and avoid shorting power terminals. Thresholds, component locations, wire numbers, fuse locations, and reset procedures can vary by model, configuration, and serial number. Confirm them in the service documentation for your exact machine.

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Frequently asked questions

What does Bobcat code A8605 mean?

It means the ACD/RACD controller detected voltage on output "G" (controller pin J1 B-4) when it had not commanded that output on. This points to a short to battery voltage somewhere on that circuit. The controller disables output "G" until the issue is fixed.

What is the panel display number for A8605?

On the display panel the code shows as 86-05.

Will the machine still run with an A8605 code?

The machine itself is not disabled, but output "G" is shut off, so whatever attachment function or solenoid is wired to that output will not operate until the short is repaired.

What usually causes an A8605 short to battery?

Common causes include the output "G" wire itself shorted to a battery voltage source, a failed output "G" solenoid, corrosion or pushed-back pins in the connectors along the mainframe or attachment control harness, or in some cases a fault inside the ACD/RACD controller.

How do I clear code A8605 after repair?

Cycle the key power off and back on once the short is repaired. No other clearing procedure is listed for this code.

What if the A8605 code is not active when I check it?

If the code is intermittent and not present during testing, the exact cause may not be found right away. Check for loose connections, corrosion, and pushed-back pins throughout the harness and connectors, and consider that the controller or wiring itself could be an intermittent contributor.

Which Bobcat machines can show code A8605?

This code applies to Bobcat excavators (E35, E42, E45, E55) and skid-steer/track loaders (S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, T870) that use the ACD/RACD attachment control controller.