Bobcat D7573 (75-73) Fault Code: Operating Mode Switch Flipped While Operating
Also shown on the panel as 75-73 · Also called Drive Operating Mode Switch Flipped While Operating
Operating Mode Switch Flipped While Operating · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
D7573 (panel form 75-73) sets when the Drive/Drive Plus controller detects a change in the operating mode switch signal while the machine is running. This shuts off drive, lift, and tilt functions until the fault is cleared and Press To Operate Loader (PTOL) is re-enabled.
High severity. Drive, lift, and tilt are all disabled the moment this code sets, which stops work immediately. It is not a machine-damage code, but it takes away control functions the operator needs, so it should be treated as stop-and-diagnose-now rather than something to note for later.
What does Bobcat error code D7573 mean?
Bobcat loaders with selectable drive patterns use an operating mode switch to tell the Drive/Drive Plus controller whether the machine is in H-pattern/skid mode or another drive mode. When the switch is in H-pattern/skid mode, battery voltage is fed to the controller on wire 4550. The controller watches this signal continuously while the loader is running.
D7573 occurs when the controller sees the signal on wire 4550 change while the machine is actively operating, meaning the operating mode switch position appears to have flipped mid-use. Because the controller cannot be sure which mode is actually selected, it disables drive, lift, and tilt as a precaution until the situation is sorted out and cleared.
This code covers two closely related description texts, 'Drive Operating Mode Switch Flipped While Operating' and 'Operating Mode Switch Flipped While Operating.' Both point to the same wiring and switch circuit and the same set of possible causes.
Common causes of D7573
- The operator physically changed the operating mode switch position while the machine was running.
- Signal wire 4550 shorted to supply voltage, shorted to ground, or open.
- Supply wire 1785 open.
- A failed or faulty operating mode switch.
- A failed Drive/Drive Plus controller.
- Moisture, corrosion, or pushed back pins in the Drive/Drive Plus controller connector, the switch connector, the cab harness, the main frame harness, or the AWS/SJC harness connectors.
- Intermittent faults from loose connections, corrosion, pushed back pins, the controller, the wire harness, or a combination of these problems, which may not be found if the code is not active during testing.
How to troubleshoot Bobcat D7573: first checks
- Confirm the operating mode switch is set to the intended position and was not bumped or changed during operation.
- With key switch on, PTOL enabled, and engine running, verify the drive command function and watch for the code resetting.
- Inspect the operating mode switch connector, the Drive/Drive Plus controller connector, the cab harness, the main frame harness, and the AWS/SJC harness connectors for moisture, corrosion, or pushed back pins.
- Check signal wire 4550 for a short to supply voltage, a short to ground, or an open circuit.
- Check supply wire 1785 for an open circuit.
- If the code is not active during testing, treat it as intermittent and focus on loose connections, corrosion, and pushed back pins in the connectors listed above before condemning the switch or controller.
How the code clears
The only clearing condition listed is that Press To Operate Loader (PTOL) must be enabled. No separate reset procedure or additional clearing step is listed beyond re-enabling PTOL after the underlying wiring, switch, or controller issue has been corrected.
Affected models and serial ranges
D7573 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-ATZC99999 |
| 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 |
| 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 D7573 mean?
It means the Drive/Drive Plus controller saw the operating mode switch signal change while the machine was operating. Since the controller can't confirm which drive mode is actually selected, it shuts off drive, lift, and tilt until the fault clears.
Why did my Bobcat lose drive, lift, and tilt all at once?
That is the expected behavior for D7573. Whenever this code is active, the controller disables all three functions together as a safety precaution because it lost a reliable read on the operating mode switch.
Can simply switching the drive mode trigger this code?
Yes. One listed cause is the operator changing the operating mode switch position while the loader was running, which is enough by itself to set D7573.
What wiring is involved in D7573?
Wire 4550 carries the operating mode signal and supplies battery voltage to the Drive/Drive Plus controller when the switch is in H-pattern/skid mode. Wire 1785 is the supply wire. A short or open on either can set the code.
How do I clear D7573 after repairs?
Press To Operate Loader (PTOL) must be enabled. No other reset procedure is listed for this code.
What if the code won't show up when I test the machine?
That points to an intermittent problem. Likely causes include loose connections, corrosion, pushed back pins, the controller, or the wire harness itself, and the fault may not be pinpointed until it is active again.
Which Bobcat models can show D7573?
It applies to S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 skid steers and compact track loaders, as well as T870.