Bobcat A8003 (80-03) Fault Code: ACD/RACD Output "A" Error Off
Also shown on the panel as 80-03 · Also called ACD Output ‘A’ Error Off
ACD/RACD Output "A" Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8003 (panel display 80-03) sets when the Bobcat ACD/RACD controller sends voltage to energize the attachment solenoid coil on output "A" (wire 5250) but detects no voltage returning, meaning the circuit isn't doing what it's told. The right instrument panel will show a blinking ACD/RACD icon, and the attachment on output "A" will stop working.
Medium severity. The attachment on output "A" will not function until this is fixed, which can stop a job, but it is not a runaway safety event on its own. Treat it as a stop-and-diagnose issue rather than a shut-down-now emergency, unless the underlying short is causing other electrical symptoms.
What does Bobcat error code A8003 mean?
This code is specific to the ACD/RACD controller, which manages attachment control functions on many Bobcat skid-steer and compact track loader models. Output "A" is one of the controller's solenoid driver circuits, sent out over wire 5250 to control an attachment solenoid coil.
When the controller commands output "A" on, it expects to see voltage on that circuit as confirmation the solenoid is actually energized. A8003 means the controller sent the command but saw no voltage return, or it saw a current draw large enough that it shut the output off to protect itself. Either way, the attachment on output "A" will not work until the fault is cleared and the underlying issue is fixed.
The blinking ACD/RACD icon on the right instrument panel is the operator-visible sign of this fault. It confirms the controller has locked out that output rather than continuing to drive a shorted or faulty circuit.
Common causes of A8003
- Shorted solenoid coil on the attachment being controlled by output "A".
- Circuit output "A" wire 5250 to the attachment solenoid shorted to ground.
- A fault in the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
- An intermittent condition not present at the time of testing, which can stem from loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat A8003: first checks
- With the key switch in the run/enter position, confirm the ACD/RACD icon is blinking on the right instrument panel to verify the fault is currently active.
- Inspect the attachment control harness and mainframe connectors for moisture, corrosion, or pushed-back pins, since this is one of the most common and easiest to find causes.
- Check wire 5250 from the ACD/RACD controller to the attachment solenoid for any signs of chafing, pinching, or contact with ground (frame, mounting bolts, other bare wire).
- Test the attachment solenoid coil itself for a short, since a shorted coil is listed as a direct cause and will draw excess current on output "A".
- If the code does not appear active during testing, treat it as intermittent and check all connections, terminals, and pins in the circuit for looseness or corrosion, since an intermittent fault may not show a clear cause on the bench.
How the code clears
Once the repair is complete, cycle the key switch power off and back on to clear code A8003. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
A8003 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 A8003 mean?
It means the ACD/RACD controller sent voltage to energize the attachment solenoid coil on output "A" (wire 5250) but did not see voltage return, or saw too much current draw and shut the output off. The attachment on that output stops working and the ACD/RACD icon blinks on the right instrument panel.
Can I still use my attachment with code A8003 active?
No. The controller shuts off output "A" when this fault is detected, so the attachment connected to that output will not operate until the wiring, solenoid, or controller issue is fixed.
What usually causes A8003 on a Bobcat loader?
The listed causes are a shorted solenoid coil, wire 5250 shorted to ground between the controller and the solenoid, a fault in the ACD/RACD controller itself, or moisture, corrosion, or pushed-back pins in the mainframe or attachment control harness connectors.
Why does the code disappear when I test the machine later?
A8003 can be intermittent. If it's not active at the time of testing, the cause may be hard to pin down, and it's often loose connections, corrosion, pushed-back pins, the controller, or the wire harness, or some combination of those.
How do I clear code A8003 after making a repair?
Cycle the key switch power off and back on. No separate clearing step is listed beyond this power cycle.
Does A8003 affect the whole machine or just the attachment?
It is specific to output "A" on the ACD/RACD controller. Only the attachment or function wired to that output and wire 5250 is affected; it does not describe a broader machine shutdown.
Which Bobcat machines can show code A8003?
This code applies across a range of Bobcat skid-steer and compact track loader models equipped with an ACD/RACD controller, including S510, S530, S550, S570, S590, S630, S650, S750, S770, and the T550, T590, T630, T650, T750, T770, and T870 track loaders.