Bobcat W3239 (32-39) Fault Code: ACS Lift Actuator Not in Neutral (ACS Only)
Also shown on the panel as 32-39 · Also called ACS (AHC) Lift Actuator Not in Neutral, ACS Lift Actuator Not in Neutral (SJC Only)
ACS Lift Actuator Not in Neutral (ACS Only) · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
W3239 (panel form 32-39) sets when the lift actuator is not sitting in its neutral voltage range when the PTOL button is pressed. When it sets, the ACS disables both lift and tilt functions until the fault is corrected and power is cycled.
High severity. Lift and tilt are disabled the moment this code sets, which stops productive work and can leave an attachment or loader arm in an awkward position. It is not an immediate safety emergency, but the machine should not be put back into service until the actuator, wiring, and controller are checked.
What does Bobcat error code W3239 mean?
W3239 is an Advanced Control System (ACS) code (on some machines called AHC or SJC) tied to the lift actuator's neutral position sensing. The ACS controller expects the lift actuator to read a specific neutral voltage range, 1.8-2.22 volts, at the moment the operator presses the PTOL button. If the actuator's feedback voltage is outside that window when PTOL is pressed, the controller sets W3239.
Because the controller cannot trust the lift actuator's position at that point, it locks out both lift and tilt functions as a precaution. This prevents unpredictable loader arm or attachment movement while the position feedback is in question.
This code applies across the S510 through S770 skid steer lineup and T550 through T870 compact track loader lineup that use the ACS/AHC/SJC control system.
Common causes of W3239
- Bound spool valve preventing the lift circuit from returning fully to neutral.
- Bound lift actuator, mechanically stuck and unable to reach or hold the neutral position.
- Tilt actuator feedback wire (identified on various harnesses as 4670, 3980, or 3980/4670 depending on model) shorted to the 5-volt supply.
- Ground wire for the circuit (identified as 2630, 2670, or 2980 depending on model and harness) open.
- Faulty lift actuator itself.
- Faulty ACS controller.
- Moisture, corrosion, or pushed-back pins in the ACS controller connectors, lift actuator connectors, or ACS wiring harness.
- Intermittent fault: if the code is not active at the time of testing, the root cause may be hard to pin down. Probable causes still include loose connections, corrosion, pushed-back pins, the controller, the harness, or some combination of these.
How to troubleshoot Bobcat W3239: first checks
- With the key switch in run/enter, check that the lift actuator moves freely through its full range and returns to neutral without binding or hanging up.
- Inspect the ACS controller connectors, lift actuator connectors, and ACS harness connectors for moisture, corrosion, or pins that have been pushed back out of their sockets.
- Check the tilt actuator feedback wire (4670 and/or 3980 depending on your model) for a short to the 5-volt supply.
- Check the ground wire for the circuit (2630, 2670, or 2980 depending on model) for an open condition.
- Inspect the spool valve for the lift circuit for binding or sticking.
- If the code is not currently active, treat it as intermittent and inspect the same connectors and wiring closely rather than assuming there is no fault to find.
How the code clears
Once the bound component, wiring fault, or connector issue is repaired, cycle the key power to clear W3239. No separate reset procedure beyond cycling power is listed for this code.
Affected models and serial ranges
W3239 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, SN A3PH11001-99999 |
Frequently asked questions
What does Bobcat code W3239 mean?
It means the ACS controller saw the lift actuator outside its expected neutral voltage range, 1.8-2.22 volts, when the PTOL button was pressed. Since the controller can't confirm the actuator is in neutral, it disables lift and tilt functions.
Why did my loader lose lift and tilt after this code appeared?
That's expected behavior. W3239 automatically disables both lift and tilt functions as a safety precaution until the underlying cause is fixed and power is cycled.
What is the panel display number for W3239?
On the numeric display panel, W3239 shows as 32-39.
How do I clear W3239 after making a repair?
Cycle the key power off and back on. No other clearing procedure is listed for this code.
Can a wiring problem cause W3239 instead of a bad actuator?
Yes. A shorted tilt actuator feedback wire to the 5-volt supply, an open ground wire, or corroded/pushed-back connector pins in the ACS harness can all trigger this code without the actuator itself being defective.
What if the code doesn't show up when I test the machine?
If W3239 is intermittent and not active during testing, the cause may not be found immediately. Likely culprits are still loose connections, corrosion, pushed-back pins, the ACS controller, the wire harness, or a combination of these.
Is W3239 the same on every Bobcat model?
The underlying fault (lift actuator not in neutral when PTOL is pressed) is the same across affected S-series and T-series models, but the specific wire identifiers for the tilt feedback and ground circuits can differ by model, so check your machine's own wiring reference.