Bobcat D7542 (75-42) Fault Code: Right Swash Plate Sensor Out of Range Low
Also shown on the panel as 75-42 · Also called Drive Right Swash Plate Sensor Out of Range Low, Right Swash Plate Sensor Out Of Range Low
Right Swash Plate Sensor Out of Range Low · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
D7542 (panel display 75-42) sets when the drive/drive plus controller sees the right swash plate sensor signal drop below 0.15 volts, well under the normal 1.0 - 4.0 volt output range. The machine keeps running in speed management mode, but the drive system loses accurate control of the right pump swash plate until this is fixed.
Medium severity. The machine continues to run in speed management mode when D7542 sets, so it is not an immediate shutdown code. Still, this affects drive control on one side of the machine, so it should be diagnosed before continued heavy use, especially before working on slopes or in tight areas where uneven drive response is a hazard.
What does Bobcat error code D7542 mean?
D7542 is set by the drive or drive plus controller when the signal from the right swash plate sensor reads below 0.15 volts, far below the expected 1.0 - 4.0 volt signal range the sensor should be sending back.
The swash plate sensors sit at the bottom of each drive pump and are keyed to the swash plate itself, so the controller can track the actual angle of the plate that determines drive output. The sensor gets its supply voltage from the gateway controller, and its signal wire feeds the drive/drive plus controller.
When this code is active, the machine does not stop working. It falls back to speed management mode so the operator still has drive function, but without the normal precision feedback from the right swash plate sensor. Bobcat also notes this code can appear from an intermittent short between the signal wire and a supply voltage, not just an open or grounded circuit.
Common causes of D7542
- Supply wire 1710 open
- Signal wire (3810 or 4720, depending on machine/harness variant) shorted to ground
- Faulty right swash plate sensor
- Faulty drive/drive plus controller
- Moisture, corrosion, or pushed-back pins in the drive/drive plus controller connectors, the swash plate sensor connector, or the AWS/SJC wire harness
- Intermittent condition: if the code is not active at the time of testing, the cause may not be found immediately. Loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these are the likely suspects
How to troubleshoot Bobcat D7542: first checks
- With key switch (run/enter) on and the code active, check for continuity and voltage on supply wire 1710 to confirm it is not open
- Check the signal wire (3810 or 4720 depending on your machine's harness) for a short to ground or an intermittent short to a supply voltage
- Inspect the right swash plate sensor connector and the drive/drive plus controller connectors for moisture, corrosion, or pushed-back pins
- Inspect the AWS/SJC wire harness along its run for chafing, pinch points, or connector damage
- If the code is not present during testing, wiggle-test the harness and connectors while monitoring for the code to reappear, since an intermittent fault may not show up on a static check
- Test or substitute the right swash plate sensor itself if wiring and connectors check good
- Verify controller operation if the sensor and wiring test good but the code persists
How the code clears
Once the repair is complete, cycle power (turn the key switch off and back on) to clear the code. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
D7542 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 D7542 mean?
It means the drive or drive plus controller is seeing a signal from the right swash plate sensor that is too low, below 0.15 volts, when it should be reading somewhere in the 1.0 - 4.0 volt range. This points to a wiring, sensor, or controller problem on the right pump's swash plate feedback circuit.
Can I keep operating the machine with D7542 active?
The machine will continue to run in speed management mode, so it is drivable, but it is doing so without accurate feedback from the right swash plate sensor. It is best to get it diagnosed as soon as practical rather than running it long-term in this mode.
What is the panel display code for D7542?
On the panel it shows as 75-42.
What wires should I check first for D7542?
Start with supply wire 1710 for an open circuit, and check the signal wire, either 3810 or 4720 depending on the specific machine harness, for a short to ground or an intermittent short to a supply voltage.
Why does the code disappear during testing but come back later?
This is typical of an intermittent short or a connector problem. Bobcat notes that if the code is not active during testing, the cause may not be identified right away. Loose connections, corrosion, pushed-back pins, the controller, or the wire harness are the usual suspects in these intermittent cases.
How do I clear D7542 after repair?
Cycle the key switch off and back on. No other clearing procedure is listed.
Which Bobcat models can show code D7542?
This code applies across S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, and T870 models.