DiagnosticsMedium severity

Bobcat A8606 (86-06) Fault Code: ACD/RACD Output “G” Short to Ground

Also shown on the panel as 86-06 · Also called ACD Output ‘G’ Short to Ground, ACD/RACD Output “G” Short to Ground

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

TL;DR

Bobcat fault code A8606, shown on the panel as 86-06, sets when the ACD/RACD controller commands output "G" (controller pin J1 B-4) but does not detect voltage on that circuit, meaning it has read a short to ground. When this happens, the controller disables output "G" until the fault is cleared and repaired.

Medium severity. Output "G" is disabled once this code sets, so whatever attachment function or solenoid that output controls will stop working. This does not by itself indicate an engine or hydraulic system emergency, but you should not keep cycling the attachment function while the short is present, since that can stress the controller or wiring further.

What does Bobcat error code A8606 mean?

A8606 is set by the ACD/RACD (Attachment Control Device / Remote Attachment Control Device) controller. This controller manages powered attachment functions on skid steers, compact track loaders, and compact excavators, energizing specific outputs to run solenoids on attachments.

Output "G" is one of these controlled circuits, tied to controller pin J1 B-4. When the controller commands this output on, it expects to see voltage appear on the circuit. If it commands the output and instead detects that the circuit is shorted to ground, it logs A8606 and immediately disables output "G" so it cannot keep trying to drive a shorted circuit.

In plain terms, the controller tried to turn something on, saw a dead short to ground instead of the expected voltage, and shut that output down to protect itself and the wiring.

Common causes of A8606

Output "G" circuit, controller pin J1 B-4, shorted to ground somewhere in the wiring.
Faulty output "G" solenoid.
Faulty ACD/RACD controller.
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.
Intermittent fault: if the code is not active at the time of testing, the exact cause may not be identifiable right away. Probable causes for an intermittent version include loose connections, corrosion, pushed-back pins, the controller itself, the wire harness, or a combination of these problems.

How to troubleshoot Bobcat A8606: first checks

Confirm the key switch / run-enter switch is on, since that is the condition required for the controller to set this code in the first place.
Inspect the output "G" solenoid connector and wiring for visible damage, chafing, or a pinched wire that could be grounding the circuit.
Check the ACD/RACD controller connectors, the mainframe harness, and the attachment control harness for moisture, corrosion, or pins that have pushed back out of their connector body.
With power off, disconnect the output "G" solenoid and check the wiring from controller pin J1 B-4 to the solenoid connector for a short to ground, isolating whether the fault is in the harness, the solenoid, or the controller.
If the code is not currently active, treat it as intermittent and focus on connection integrity: reseat connectors, look for corrosion, and check for pushed-back pins rather than assuming a single hard failure.

How the code clears

Once the repair is complete, the listed step to clear A8606 is to cycle power. No separate reset procedure is listed for this code beyond turning the machine off and back on after the fault has been corrected.

Affected models and serial ranges

A8606 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 A8606 mean?

It means the ACD/RACD controller commanded output "G" (controller pin J1 B-4) on but detected a short to ground instead of the expected voltage. The controller then disables output "G".

What is the ACD/RACD controller on a Bobcat machine?

It is the Attachment Control Device / Remote Attachment Control Device controller, which manages powered functions for attachments connected to the machine.

Which Bobcat machines can show A8606?

This code applies across a range of Bobcat compact equipment including the E35, E42, E45, E55 excavators and the S510, S530, S550, S570, S590, S630, S650, S750, S770 skid steers along with the T550, T590, T630, T650, T750, T770, T870 compact track loaders.

Will my attachment stop working if I get this code?

Yes. Once A8606 sets, the controller disables output "G", so whatever solenoid or function runs on that output will not operate until the short is fixed and the code is cleared.

How do I clear A8606 after fixing the problem?

Cycle power to the machine after completing the repair. That is the only clearing step listed for this code.

Why does the code come and go instead of staying on?

An intermittent A8606 usually points to a loose connection, corrosion, or a pushed-back pin rather than a constant hard short. These conditions can make and break contact with vibration or temperature changes, so the code may not be present when you test.

What should a technician check first for A8606?

Start with the key switch/run-enter position, then inspect the output "G" solenoid and its wiring, followed by the ACD/RACD controller connectors and harness connections for corrosion, moisture, or pushed-back pins before condemning the controller itself.