Bobcat A8203 (82-03) Fault Code: ACD/RACD Output "C" Error Off
Also shown on the panel as 82-03 · Also called ACD Output ‘C’ Error Off
ACD/RACD Output "C" Error Off · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat fault code A8203, shown on the panel as 82-03, means the ACD/RACD controller sent voltage to energize the attachment solenoid coil on output C (wire 5300) but detected no voltage returning. The controller shuts off that output to protect itself, the attachment on output C stops working, and the ACD/RACD icon on the right instrument panel blinks.
Medium severity. The affected attachment function on output C will not operate until the fault is fixed, but the machine can generally still be driven and other functions used. Treat it as a stop-and-diagnose issue before relying on that attachment circuit, especially if it's tied to a safety-relevant function.
What does Bobcat error code A8203 mean?
A8203 is set by the Advanced Control/Remote Advanced Control (ACD/RACD) controller, which manages powered attachments through dedicated output circuits. Output C runs through wire 5300 to an attachment solenoid coil. The controller commands voltage out that wire to energize the coil, then checks for voltage feedback to confirm the circuit did what it was told.
When the controller sends the command but sees no voltage on wire 5300, it assumes something is wrong downstream, such as a short. If the controller senses a large current draw on that output, it will shut the output off entirely as a protective measure, and the attachment connected to output C will not function until the issue is cleared.
The dash indicator for this fault is a blinking ACD/RACD icon on the right instrument panel. This is your visual cue that an attachment circuit fault has been detected, separate from other engine or hydraulic warning lights.
Common causes of A8203
- Shorted solenoid coil on the attachment connected to output C.
- Circuit output C, wire 5300, shorted to ground between the controller and the attachment solenoid.
- A fault in the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the connectors within the mainframe wiring harness or the attachment control harness.
- Intermittent conditions: if the code is not active at the time of testing, the root cause may not be found immediately. Probable causes for intermittent faults include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat A8203: first checks
- Turn the key switch to run/enter (this is the condition required for the code to be active) and confirm whether the ACD/RACD icon is blinking on the right instrument panel.
- Inspect the attachment solenoid coil for signs of an internal short, and check its resistance if you have a way to test it against a known-good coil.
- Trace wire 5300 from the ACD/RACD controller output C to the attachment solenoid, looking for chafed insulation, pinched sections, or any point where it could be shorted to ground.
- Open up the mainframe harness connectors and the attachment control harness connectors and inspect pins for moisture, corrosion, or pins that have been pushed back out of their proper seated position.
- Check all connections in the circuit for looseness, since a loose connection can cause an intermittent version of this fault that won't show up if you test only once.
- If the wiring and solenoid check out clean, suspect the ACD/RACD controller itself as the source of the fault.
How the code clears
Once the repair is complete, the fault is cleared by cycling power on the machine (turning the key off and back on). No separate reset procedure or diagnostic tool step is listed for this code beyond a power cycle.
Affected models and serial ranges
A8203 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 A8203 mean?
It means the ACD/RACD controller tried to energize the attachment solenoid on output C, wire 5300, but detected no return voltage, or detected too much current draw, so it shut that output off. The attachment connected to output C will not work until this is fixed.
Why is my ACD/RACD icon blinking on the dash?
A blinking ACD/RACD icon on the right instrument panel is the direct dash indicator for A8203 and related output errors. It tells you the controller has detected a problem on one of its attachment output circuits.
Can I still use my Bobcat with A8203 active?
The specific attachment function wired to output C will not operate while this code is active. Other machine functions are not described as affected, but you should diagnose the fault before relying on that attachment circuit.
What usually causes A8203 on a Bobcat?
The listed causes are a shorted solenoid coil, wire 5300 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.
The code only shows up sometimes. What should I check?
Intermittent A8203 codes are harder to pin down because the fault may not be active during testing. Probable causes for intermittent faults are loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems. Check every connector in the output C circuit carefully.
How do I clear A8203 after I fix it?
Cycle power on the machine, meaning turn the key off and back on. No other reset procedure is listed for this code.
Which Bobcat models can show code A8203?
This code applies to the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 models, among others equipped with the ACD/RACD attachment control system.