Bobcat W3256 (32-56) Fault Code: ACS Tilt Handle/Pedal Short to Battery

What does Bobcat error code W3256 mean?

W3256 is set by the ACS (attachment control system) controller on Bobcat loaders when it reads a signal voltage above 4.85 volts on the tilt handle or pedal input, wire 4750 for hand controls or 4760 for foot controls. The handle/pedal sensors normally get a clean 5-volt supply from the ACS controller through supply wires (labeled 1610, 5980, 1620, or 5760 depending on model and harness revision), and the controller expects the return signal to stay within a normal working range. A voltage above 4.85 volts tells the controller the signal circuit is shorted to a supply or battery voltage source rather than reflecting real handle or pedal position.

Because the controller cannot trust the tilt command signal, it disables both lift and tilt functions as a safety measure. This means the operator loses hydraulic control of the loader arms and attachment tilt until the fault is diagnosed and cleared.

This code applies across a wide 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, T770, and T870.

What triggers a Bobcat W3256 code?

The code sets when the ACS controller detects a voltage greater than 4.85 volts on the tilt handle/pedal signal wire (4750 for hand mode, 4760 for foot mode) while the key switch or run/enter switch is on and PTOL (power take-off lock, referring to the attachment control enable state) is enabled.

Common causes of W3256

• Signal wire 4750 shorted to supply voltage, affecting hand mode operation only.
• Signal wire 4760 shorted to supply voltage, affecting foot mode operation only.
• Supply wire (1610, 5980, 1620, or 5760 depending on model) shorted to battery voltage.
• Ground wire 2750/2760 open, breaking the sensor's return path.
• A failed handle/pedal sensor.
• A failed ACS controller.
• Moisture, corrosion, or pushed-back pins in the ACS controller connector, the tilt handle or pedal connector, or the ACS wiring harness.
• If the code is intermittent and not active at the time of testing, the cause may not be found right away. Likely culprits in that case are loose connections, corrosion, pushed-back pins, the controller itself, the wire harness, or some combination of these.

How to troubleshoot Bobcat W3256: first checks

1. 1 Confirm the key switch or run/enter switch is on and that PTOL is enabled, since these are the baseline conditions required for the code to be active.
2. 2With a wiring diagram for the specific model, check signal wire 4750 (hand mode) and 4760 (foot mode) for a short to a supply voltage source.
3. 3Check the applicable supply wire for that model (1610, 5980, 1620, or 5760) for a short to battery voltage.
4. 4Check ground wire 2750/2760 for continuity, since an open ground on this circuit is a listed cause.
5. 5Inspect the ACS controller connector, the tilt handle connector, and the tilt pedal connector for moisture, corrosion, or pins that have been pushed back out of their sockets.
6. 6If the code is not currently active, treat it as intermittent and focus on connector and harness integrity, since a controller or harness fault that is not present during testing may not show up on a static check.
7. 7If wiring and connectors check out, test the handle/pedal sensor itself, and consider the ACS controller as the last suspect if all wiring and sensors test good.

How the code clears

All listed procedures agree on the same clearing step: cycle power. After completing repairs, turn the key switch off and back on to clear the code. No separate reset procedure or scan tool clearing step is listed beyond cycling power.

Affected models and serial ranges

W3256 appears in our records across 16 Bobcat models. Match your machine by model and serial number.