Bobcat A8002 (80-02) Fault Code: ACD/RACD Output "A" Error On
Also shown on the panel as 80-02 · Also called ACD Output ‘A’ Error On, RACD Output "A" Error On
ACD/RACD Output "A" Error On · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8002 (panel display 80-02) sets when the ACD/RACD controller sees voltage on output "A" wire 5250 without having sent voltage to energize the attachment solenoid coil. When active, the ACD/RACD electric output shuts off, the attachment on output "A" stops working, and the ACD/RACD icon on the right instrument panel blinks.
Medium severity. The affected attachment output is disabled while the code is active, which can stop attachment work, but it does not by itself indicate an engine, hydraulic, or structural safety failure. Treat it as a diagnose-soon issue rather than a stop-everything emergency, unless the attachment in use needs that output to operate safely.
What does Bobcat error code A8002 mean?
A8002, also shown as 80-02 on the instrument panel, is set by the Advanced Combination Drive or Remote Advanced Combination Drive (ACD/RACD) controller. This controller manages electric outputs that energize attachment solenoids. Output "A" runs through wire 5250 to the attachment solenoid coil.
The controller expects that when it has not commanded output "A" on, there should be no voltage present on that circuit. If it detects voltage on wire 5250 while it did not send any, it flags this as an error condition because that voltage is unexpected and could indicate a short to a power source elsewhere in the circuit.
Once A8002 goes active, the controller shuts off the ACD/RACD electric output entirely. That means the attachment wired to output "A" will not function until the fault is cleared, and the operator will see the ACD/RACD icon blinking on the right side of the instrument panel.
Common causes of A8002
- Circuit output "A" wire 5250 to the attachment solenoid is shorted to a power source.
- A fault in the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
- An intermittent fault that is not present at the time of testing. In this case the exact cause may not be identifiable right away. Probable underlying issues include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat A8002: first checks
- With the key switch in run/enter (the condition under which this code sets), check for the ACD/RACD icon blinking on the right instrument panel to confirm the code is currently active.
- Inspect the mainframe and attachment control harness connectors for moisture intrusion, corrosion, or pins that have been pushed back out of their proper seated position.
- Trace wire 5250 from the ACD/RACD controller output "A" to the attachment solenoid coil, looking for chafing, pinched insulation, or contact with a power source that could cause an unexpected short.
- Check all connections along that circuit for looseness, since loose connections are listed as a likely contributor, especially if the code has appeared intermittently.
- If the code is not currently active during your inspection, treat it as intermittent: recheck harness routing, connector seating, and corrosion at every connector in the circuit, since the cause may not show up on a single static test.
How the code clears
Cycle power to clear A8002 once the repair is complete. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
A8002 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 A8002 mean?
It means the ACD/RACD controller detected voltage on output "A" wire 5250 when it had not sent any voltage to energize the attachment solenoid coil. The controller responds by shutting off that output, so the attachment connected to it stops working, and the ACD/RACD icon blinks on the right instrument panel.
Why did my attachment on output A stop working?
When A8002 is active, the ACD/RACD controller shuts off the entire electric output "A" as a protective response to the unexpected voltage it detected. The attachment wired to that output will not operate again until the fault is diagnosed, repaired, and the code is cleared.
What usually causes A8002?
The most common causes are a short to a power source somewhere on wire 5250 between the controller and the attachment solenoid, a fault in the ACD/RACD controller itself, or moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
How do I clear code A8002 after fixing the problem?
Cycle power. That is the only clearing step listed once the repair has been completed.
What if the code shows up but I can't find anything wrong?
That points to an intermittent fault. If the code is not active at the time of testing, the exact cause may not be identifiable right away. Focus on loose connections, corrosion, and pushed-back pins throughout the circuit, since these are the most likely intermittent culprits along with the controller and wire harness itself.
Which Bobcat machines can show code A8002?
It applies across 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, as well as the T870.
Is A8002 the same as 80-02 on the display?
Yes. 80-02 is simply the numeric panel form of the same fault code A8002.