Bobcat A8005 (80-05) Fault Code: ACD/RACD Output “A” Short to Battery
Also shown on the panel as 80-05 · Also called ACD Output ‘A’ Short to Battery, ACD/RACD Output “A” Short to Battery
ACD/RACD Output “A” Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
A8005 (panel display 80-05) sets when the ACD/RACD controller sees voltage on output "A" (controller pin J1 B-5) when that output has not been commanded on. The controller responds by disabling output "A" until the fault clears.
Medium severity. Output "A" is disabled while the fault is active, which means the attachment function tied to that output will not work. This is not an engine-damage or immediate-safety event by itself, but a disabled attachment output can affect attachment control, so it should be diagnosed before returning the machine to normal work with that attachment.
What does Bobcat error code A8005 mean?
A8005 is set by the ACD/RACD controller (the attachment control device / remote attachment control device controller) when it detects voltage present on output "A", at controller pin J1 B-5, at a time when the controller itself has not commanded that output on. In other words, the controller expects that circuit to be at zero or low voltage unless it turns it on, and instead it sees battery voltage feeding back into it.
Because this condition indicates an unexpected voltage source on that circuit, most likely a short to battery voltage somewhere in the wiring or solenoid, the controller disables output "A" as a protective measure. This prevents the attachment function connected to that output from operating unpredictably.
This code applies across the ACD/RACD-equipped Bobcat skid-steer, track loader, and compact excavator lineup listed for this fault, and the diagnostic logic is the same across those platforms.
What triggers a Bobcat A8005 code?
The code sets whenever the key switch or run/enter switch is on and the controller detects voltage on output "A" (pin J1 B-5) without having commanded it. No separate voltage, time, or rpm thresholds are listed for this code beyond that condition.
Common causes of A8005
- Output "A" wiring at controller pin J1 B-5 shorted to battery voltage.
- Return wire at controller pin J1 A-2 shorted to battery voltage.
- A failed output "A" solenoid.
- A fault inside the ACD/RACD controller itself.
- Moisture, corrosion, or pushed-back pins in the ACD/RACD controller connectors, the mainframe harness, the attachment control harness, or the output "A" solenoid connector.
- Intermittent causes that are not present at the time of testing, which can include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat A8005: first checks
- With key switch / run-enter on, check for the code and note whether it is active now or was only stored, since an intermittent fault may not be found during static testing.
- Inspect the ACD/RACD controller connectors, mainframe harness connectors, and attachment control harness connectors for moisture, corrosion, or pins that have been pushed back out of the connector body.
- Check the output "A" circuit at controller pin J1 B-5 for a short to battery voltage, and check the return wire at controller pin J1 A-2 for the same condition.
- Inspect the output "A" solenoid and its wiring for damage, corrosion, or an internal short.
- If no fault is found with the harness and solenoid, suspect the ACD/RACD controller itself.
- Wiggle-test harness connectors and wiring while monitoring for the code if the fault is intermittent, since a solid fault may not show up under a static check.
How the code clears
Cycle power to the machine (turn the key switch off, then back on) after the repair is complete. No separate reset or relearn procedure is listed for this code.
Affected models and serial ranges
A8005 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 |
Frequently asked questions
What does Bobcat code A8005 mean?
It means the ACD/RACD controller detected voltage on output "A" (controller pin J1 B-5) when it had not commanded that output on. The controller disables output "A" in response.
What is the panel display number for A8005?
On the display panel this code shows as 80-05.
Which Bobcat machines can show code A8005?
It applies to ACD/RACD-equipped models including the E35, E42, E45, E55 excavators and S510, S530, S550, S570, S590, S630, S650, S750, S770 skid-steers, plus T550, T590, T630, T650, T750, T770, T870 track loaders.
Will the attachment still work with A8005 active?
No, output "A" is disabled once the code sets, so whatever attachment function relies on that output will not operate until the fault is fixed and the code is cleared.
What usually causes A8005?
The most common causes are a short to battery voltage on the output "A" wire or its return wire, a failed output "A" solenoid, corrosion or pushed-back pins in the connectors, or a fault in the ACD/RACD controller itself.
How do you clear code A8005 after repair?
Cycle the key switch off and back on. No other reset procedure is listed.
Why does A8005 come and go instead of staying on?
Intermittent occurrences are usually tied to loose connections, corrosion, or pushed-back pins that only cause a short under certain vibration, moisture, or connector positions. If the fault is not present during testing, it may need a wiggle test or repeated operation to reproduce.