Bobcat A8703 (87-03) Fault Code: ACD/RACD Output "H" Error Off
Also shown on the panel as 87-03 · Also called ACD Output ‘H’ Error Off
ACD/RACD Output "H" Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8703 (panel display 87-03) sets when the ACD/RACD controller commands output "H" (wire 5050) to energize the attachment solenoid coil but does not detect voltage there, or shuts the output off due to a large sensed current draw. The right instrument panel ACD/RACD icon blinks and the attachment on output "H" stops working.
Medium severity. The affected attachment function on output "H" will not operate, which limits attachment control but does not by itself indicate a driving, lifting, or engine safety hazard. Diagnose before relying on the attachment circuit again.
What does Bobcat error code A8703 mean?
A8703 is set by the ACD/RACD controller (Attachment Control Device / Remote Attachment Control Device) when it commands output "H" on wire 5050 to energize an attachment solenoid coil but does not see the voltage it expects to detect at that output.
The controller also monitors current draw on this circuit. If it senses a large current draw, it shuts the output off as a protective measure, and the attachment connected to output "H" will not function until the fault is resolved.
When this code is active, the right instrument panel ACD/RACD icon blinks to alert the operator. This is an electrical circuit fault, not a hydraulic or mechanical failure of the attachment itself, though a shorted solenoid coil in the attachment can be the root cause.
Common causes of A8703
- Shorted solenoid coil in the attachment connected to output "H".
- Circuit output "H" wire 5050 to the attachment solenoid shorted to ground.
- Fault in the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
- Intermittent conditions where the code is not active at the time of testing. Possible causes in this case include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these.
How to troubleshoot Bobcat A8703: first checks
- With key switch / run-enter on, check for a blinking ACD/RACD icon on the right instrument panel confirming the active code.
- Inspect the attachment solenoid coil for a short. Disconnect and test the coil separately from the harness.
- Trace circuit output "H" wire 5050 from the controller to the attachment solenoid, checking for a short to ground anywhere along its length.
- Inspect mainframe and attachment control harness connectors for moisture, corrosion, or pins that have been pushed back out of their sockets.
- Check all connections in the attachment control circuit for looseness, since a loose connection can cause an intermittent version of this code that is hard to catch during a static test.
- If no fault is found with the coil or wiring, suspect the ACD/RACD controller itself.
How the code clears
Cycle power to clear code A8703 once the repair is complete. No separate clearing step is listed beyond cycling the key switch off and back on.
Affected models and serial ranges
A8703 appears in our records across 16 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| 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 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 A8703 mean?
It means the ACD/RACD controller commanded output "H" (wire 5050) to energize an attachment solenoid coil but did not detect voltage there, or it shut the output off after sensing a large current draw. The attachment on output "H" will not work while this is active.
Why is my ACD/RACD icon blinking on the instrument panel?
A blinking ACD/RACD icon on the right instrument panel is the operator-facing signal that code A8703 (or a related ACD/RACD output fault) is active. It means the controller detected a problem with the output "H" circuit and disabled that attachment function.
Can a bad solenoid coil cause A8703?
Yes. A shorted solenoid coil in the attachment is listed as one of the possible causes. Disconnecting and testing the coil separately from the harness is a good first step.
Is A8703 an electrical or hydraulic fault?
It is an electrical circuit fault. The controller is checking for voltage and current on the output "H" wiring circuit, not monitoring hydraulic pressure or flow directly. A hydraulic attachment problem could still result if the solenoid coil itself is shorted.
How do I clear code A8703 after repair?
Cycle power (turn the key switch off and back on) once the repair is complete. No other clearing procedure is listed.
Why does A8703 come and go instead of staying on?
An intermittent A8703 is often caused by loose connections, corrosion, or pins pushed back in the mainframe or attachment control harness connectors. These conditions can cause the circuit to momentarily fail and then reconnect, so the code may not be present when you test.
Which Bobcat machines can show code A8703?
It applies to a range of skid-steer and compact track loader models including the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770.