Bobcat M4722 (47-22) Fault Code: 8 Volt Sensor Supply Out of Range Low
Also shown on the panel as 47-22
8 Volt Sensor Supply Out of Range Low · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M4722 (panel code 47-22) sets when the Bobcat gateway controller sees its 8 volt sensor supply drop below 7.15 volts. This supply feeds the hydraulic charge pressure sensor, engine coolant temperature sensor, and hydraulic oil temperature sensor, so a low reading can affect readings from all three at once.
Medium severity. M4722 itself is a sensor supply fault, not a direct engine or hydraulic protection shutdown. But because the 8 volt rail feeds the hydraulic charge pressure sensor, engine coolant temperature sensor, and hydraulic oil temperature sensor together, losing it can blind the controller to real engine or hydraulic problems. Diagnose it before returning the machine to heavy work.
What does Bobcat error code M4722 mean?
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M4722 is a sensor supply voltage code. The Bobcat gateway controller runs an internal 8 volt reference rail out to several sensors around the machine. When the controller measures that supply below 7.15 volts, it flags M4722 (shown on some panels as 47-22).
This 8 volt line is shared by the hydraulic charge pressure sensor, the engine coolant temperature sensor, and the hydraulic oil temperature sensor. Because all three sensors depend on the same supply, a short or fault anywhere on that circuit can pull the whole rail down and affect readings from more than one sensor at the same time.
The code sets with the key switch in the run/enter position. It is listed as self resetting once the underlying problem is corrected, so no separate manual clear procedure is needed.
Common causes of M4722
- 8 volt supply wire (identified in wiring diagrams as wire 5190 or wire 3400 depending on model/harness) shorted to ground
- Faulty hydraulic charge pressure sensor drawing down or shorting the shared 8 volt supply
- Internal fault in the gateway controller itself
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the hydraulic charge pressure sensor connector, or the mainframe harness
- Intermittent condition where the code is not active at the time of testing, which can point to pushed-back pins, a marginal controller, harness wear, or a combination of these issues rather than a single hard fault
How to troubleshoot Bobcat M4722: first checks
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- With the key switch on and the code active, check for 7.15 volts or higher on the 8 volt sensor supply at the gateway controller and at the hydraulic charge pressure sensor connector to see where the drop occurs
- Inspect the gateway controller connectors and the hydraulic charge pressure sensor connector for moisture, corrosion, or pins that have been pushed back out of their sockets
- Trace the 8 volt supply wire (5190 or 3400 depending on the harness) for chafing, pinch points, or a short to ground, especially anywhere it runs near the mainframe harness
- Disconnect the hydraulic charge pressure sensor and recheck the supply voltage; if it recovers, the sensor itself may be pulling the rail down
- If the code only shows up intermittently, wiggle-test the harness and connectors near the gateway controller and sensor while watching for the fault to reappear, since intermittent faults often trace back to pushed-back pins or chafed wiring rather than a single failed part
How the code clears
No separate reset procedure is needed. The code is self resetting once the short to ground or connector/harness problem is repaired and the 8 volt supply reads back above the threshold with the key switch on.
Affected models and serial ranges
M4722 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 M4722 mean?
It means the gateway controller detected its 8 volt sensor supply below 7.15 volts. That supply powers the hydraulic charge pressure sensor, engine coolant temperature sensor, and hydraulic oil temperature sensor.
Is M4722 the same as panel code 47-22?
Yes. 47-22 is the numeric panel display form of fault code M4722 on affected Bobcat machines.
Can I keep operating with M4722 active?
It is not listed as an automatic shutdown code, but since it can affect coolant temperature and hydraulic charge pressure and oil temperature readings at the same time, it is best treated as a stop-and-diagnose condition rather than something to ignore.
What usually causes M4722?
The most common causes are the 8 volt supply wire shorted to ground, a failed hydraulic charge pressure sensor, a gateway controller fault, or moisture and corrosion in the connectors and mainframe harness.
Do I need a special reset procedure after fixing M4722?
No. The code is self resetting once the short or connector/wiring problem is fixed and the supply voltage reads correctly with the key switch on.
Which Bobcat models use this code?
M4722 applies across S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770/T870 skid steer and track loader models.
Why does one sensor fault affect coolant and hydraulic temperature readings too?
Because the hydraulic charge pressure sensor, engine coolant temperature sensor, and hydraulic oil temperature sensor all share the same 8 volt supply from the gateway controller. A short on that shared circuit pulls the voltage down for all three at once.