Bobcat M0722 (07-22) Fault Code: Hydraulic Oil Temperature Out of Range Low
Also shown on the panel as 07-22 · Also called Hydraulic Fluid Temperature Out of Range Low, Hydraulic Oil Temperature Out Of Range Low
Hydraulic Oil Temperature Out of Range Low · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M0722 (panel code 07-22) sets when the gateway controller sees voltage on the hydraulic oil temperature sensor signal wire (3220 or 3300, depending on model) drop below 0.4 volts. That points to a short to ground on the signal wire, the 8-volt supply, the sensor itself, or the gateway controller. The code is self resetting once the fault clears.
Medium severity. M0722 does not by itself shut the machine down or indicate an active overheating condition. It means the controller cannot trust the hydraulic oil temperature reading, which can affect cooling fan control and other temperature-based logic. Diagnose it before it masks a real overheat condition.
What does Bobcat error code M0722 mean?
M0722 is a Bobcat fault code that fires when the gateway controller reads a voltage below 0.4 volts on the hydraulic oil temperature sensor's signal wire, either wire 3220 or wire 3300 depending on the machine's wiring configuration.
The hydraulic oil temperature sensor works off an 8-volt supply from the controller. With the sensor unplugged, the signal wire should read 7.85 volts (±0.05 volts). The sensor itself has an operating resistance range of 500 to 3000 ohms, and resistance rises as oil temperature rises, which raises the voltage on the signal wire. A voltage under 0.4 volts tells the controller the circuit is shorted low, not that the oil is actually cold.
In plain terms, the controller is not seeing a valid temperature signal at all. It is reading a dead short to ground somewhere between the sensor and the controller, rather than a real low-temperature value.
What triggers a Bobcat M0722 code?
The code sets when the gateway controller detects voltage on the hydraulic oil temperature signal wire (3220 or 3300) below 0.4 volts, with the key switch in the run/enter position.
Common causes of M0722
- Signal wire 3220 or 3300 shorted to ground somewhere in the mainframe harness.
- The 8-volt supply feeding the hydraulic oil temperature sensor shorted to ground.
- A failed hydraulic oil temperature sensor.
- A faulty gateway controller.
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the hydraulic oil temperature sensor connector, or the mainframe wire harness.
- An intermittent fault: 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 can all be involved.
How to troubleshoot Bobcat M0722: first checks
- With the key on and the sensor unplugged, check for 7.85 volts (±0.05 volts) on the signal wire (3220 or 3300 depending on model). A reading near zero with the sensor disconnected points to a short to ground in the wire or the 8-volt supply rather than the sensor.
- Inspect the hydraulic oil temperature sensor connector and the gateway controller connectors for moisture, corrosion, or pushed-back pins.
- Check the resistance of the hydraulic oil temperature sensor itself; it should fall within 500 to 3000 ohms depending on oil temperature. A reading of zero ohms or a dead short indicates a failed sensor.
- Trace the mainframe wire harness for chafe points, pinches, or exposed wire that could be shorting signal wire 3220 or 3300 to ground.
- If the fault does not show up during testing, treat it as intermittent and recheck all connectors and harness routing for loose connections or corrosion before assuming the controller is at fault.
How the code clears
M0722 is self resetting. Once the short to ground is repaired and the sensor circuit reads correctly, the code clears on its own without a separate manual reset procedure.
Affected models and serial ranges
M0722 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, SN A3NW11249-99999 |
| S750 | SN A3P211001-299999 |
| S770 | 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 M0722 mean?
It means the gateway controller detected voltage below 0.4 volts on the hydraulic oil temperature sensor's signal wire, which normally indicates a short to ground somewhere in that circuit rather than an actual low oil temperature reading.
Is M0722 the same as panel code 07-22?
Yes. 07-22 is the numeric panel display form of fault code M0722 on affected Bobcat machines.
Can I keep operating with M0722 active?
The machine will typically still run, but the controller cannot get a valid hydraulic oil temperature reading while this code is active, which can affect cooling fan control and other temperature-based functions. Diagnose it as soon as practical rather than ignoring it.
Do I need to manually clear M0722 after the repair?
No. This code is self resetting. Once the short to ground is fixed and the sensor circuit reads normal voltage, the code clears on its own.
Which wire should I check for M0722, 3220 or 3300?
It depends on your specific Bobcat model and wiring configuration. Some machines use signal wire 3220, others use 3300, but both share the same 8-volt supply and the same fault logic.
What is the normal resistance range for the hydraulic oil temperature sensor?
The sensor's operating range is 500 to 3000 ohms, with resistance rising as hydraulic oil temperature rises. A reading well outside that range, especially near zero ohms, suggests a failed sensor or a shorted circuit.
Why does disconnecting the sensor help diagnose M0722?
With the sensor unplugged, the signal wire should read 7.85 volts (±0.05 volts) if the wiring and 8-volt supply are healthy. If that voltage is missing with the sensor disconnected, the problem is in the wire or the controller's supply, not the sensor itself.