Bobcat W3253 (32-53) Fault Code: ACS Lift Handle/Pedal Short to Ground
Also shown on the panel as 32-53 · Also called ACS (AHC) Lift Handle/Pedal Short to Ground
ACS Lift Handle/Pedal Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
W3253 (panel code 32-53) sets when the Bobcat ACS (Advanced Control System) controller sees a voltage below 0.9 volts on the lift handle/pedal signal wire 4650 or 4660. When this code is active, lift and tilt functions are disabled until the fault is fixed and power is cycled.
High severity. The machine disables lift and tilt functions the moment this code is active, so it stops loader operation, but it is not a fire, injury, or engine-damage risk by itself. Treat it as a stop-work-until-fixed issue rather than an emergency shutdown.
What does Bobcat error code W3253 mean?
W3253 is set by the ACS controller, the module that manages Bobcat's Advanced Control System joystick/pedal inputs for lift and tilt. The controller sends out 5 volts on a supply wire (1510 or 5650 for the lift/tilt handle circuit, 1520 or 5660 for the pedal circuit, depending on model and harness version) to power the handle or pedal position sensor. That sensor returns a signal voltage on wire 4650 (hand mode) or 4660 (foot mode) that tells the controller how far the handle or pedal is being moved.
If the controller sees the signal wire voltage drop below 0.9 volts, it interprets that as a short to ground somewhere in the handle/pedal sensor circuit. Since the controller can no longer trust the position signal, it disables lift and tilt as a safety measure rather than risk uncommanded or inaccurate loader movement.
This code affects the ACS-equipped Bobcat loader lineup, including S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770 and T870 models. The exact supply wire numbers referenced (1510/5650 and 1520/5660) vary slightly by model and harness revision, but the fault logic is the same across all of them.
What triggers a Bobcat W3253 code?
The ACS controller sets W3253 when it detects a signal voltage below 0.9 volts on the lift handle/pedal signal wire (4650 for hand mode, 4660 for foot mode) while the key switch is in the run/enter position and PTOL (Power Take-Off Lock, referred to in Bobcat documentation as PTOL enabled) is active.
Common causes of W3253
- Signal wire 4650 shorted to ground or open, which only affects hand mode operation
- Signal wire 4660 shorted to ground or open, which only affects foot mode operation
- Supply wire 1510 or 5650 (and/or 1520 or 5660, depending on model) shorted to ground or open, cutting or corrupting the 5-volt reference feed to the sensor
- A failed handle/pedal position sensor
- A failed ACS controller
- Moisture, corrosion, or pushed-back pins in the ACS controller connector, the lift handle or pedal connector, or anywhere in the ACS wiring harness
- An intermittent fault that is not present at the time of testing. In this case the cause may be loose connections, corrosion, pushed-back pins, the controller itself, the wire harness, or some combination of these, and it may not be pinpointable until it reoccurs
How to troubleshoot Bobcat W3253: first checks
- Confirm the code is active: turn the key switch to run/enter with PTOL enabled and verify lift/tilt are disabled and the code is currently set, not just stored as historical
- Visually inspect the ACS controller connector, the lift handle or pedal connector, and the full ACS harness run for moisture, corrosion, chafing, or pushed-back terminal pins
- With a digital multimeter, check signal wire 4650 (hand mode) or 4660 (foot mode) for a short to ground or an open circuit between the sensor and the controller
- Check the 5-volt supply wire (1510 or 5650, and 1520 or 5660 depending on your model) for a short to ground or an open circuit that would starve the sensor of its reference voltage
- Test the handle/pedal position sensor itself for correct output, and swap or bench-test it if you suspect it is the failed component
- If the code will not reproduce during testing, wiggle-test the harness and connectors at the controller and handle/pedal while watching for the code to reset, since intermittent connection issues often only show up under movement or vibration
How the code clears
Once the wiring, sensor, or controller fault is repaired, clear W3253 by cycling power to the machine (turning the key switch off and back on). No separate reset procedure or diagnostic tool step is listed beyond this power cycle.
Affected models and serial ranges
W3253 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 fault code W3253 mean?
It means the ACS controller detected a voltage below 0.9 volts on the lift handle or pedal signal wire (4650 for hand mode, 4660 for foot mode), which it reads as a short to ground in that sensor circuit. Lift and tilt functions are disabled until the issue is fixed.
Why are lift and tilt disabled when W3253 is active?
The ACS controller relies on the handle/pedal signal voltage to know the operator's commanded position. When that signal drops below the 0.9-volt threshold, the controller cannot trust the input, so it locks out lift and tilt to prevent unintended or inaccurate movement.
Can I clear W3253 without a diagnostic tool?
Yes. Once the underlying wiring, sensor, or controller problem is repaired, cycling the key switch off and back on clears the code. No special tool procedure is documented for clearing it.
Does W3253 mean my handle sensor is bad, or could it be wiring?
It could be either. The fault can be caused by a shorted or open signal wire (4650 or 4660), a shorted or open 5-volt supply wire (1510/5650 or 1520/5660), a failed handle/pedal sensor, a failed ACS controller, or corrosion and pushed-back pins in any of the connectors. Testing the wiring and sensor with a multimeter is the fastest way to narrow it down.
Why does the code only show up sometimes and then disappear?
Intermittent W3253 faults are usually caused by loose connections, corrosion, or pushed-back pins that only create a short or open circuit under certain conditions like vibration or connector movement. If the code is not active during testing, you may need to wiggle-test the harness and connectors to reproduce the fault.
Is it safe to keep operating the loader with this code active?
No. With W3253 active, lift and tilt are disabled by the controller itself, so the loader will not perform these functions until the fault is corrected. There is no practical way to keep working through this code.
Which Bobcat models can get code W3253?
It applies to ACS-equipped Bobcat loaders including the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, and T870.