Bobcat M4622 (46-22) Fault Code: 5 Volt Sensor Supply Out of Range Low
Also shown on the panel as 46-22
5 Volt Sensor Supply Out of Range Low · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M4622 (panel code 46-22) sets when the gateway controller sees less than 4.5 volts on the 5 volt sensor supply wire (5100 or 3930, depending on model) while the key switch is in run/enter. This supply feeds the seatbar sensor and the engine oil pressure sensor, so a low reading can affect both seat safety interlock function and oil pressure monitoring.
High severity. This code involves a shared 5 volt supply that feeds the seatbar safety sensor and the engine oil pressure sensor. A low supply voltage can cause loss of accurate seatbar or oil pressure readings, which affects both operator safety interlocks and engine protection monitoring. Diagnose before continued operation.
What does Bobcat error code M4622 mean?
M4622 is set by the gateway controller when it measures less than 4.5 volts on the 5 volt sensor supply circuit, identified as wire 5100 on some machines and wire 3930 on others depending on model and harness revision.
This 5 volt supply is shared between two components: the seatbar sensor, which is part of the operator presence safety interlock system, and the engine oil pressure sensor. When the supply voltage drops out of range, both of these circuits can report inaccurate or invalid readings to the controller.
Because the supply is shared, a single wiring fault or failed component can trigger more than one code at once. Bobcat notes that M4622 may appear alongside M1122 (seatbar sensor out of range low) or M0613 (engine speed no signal).
What triggers a Bobcat M4622 code?
M4622 sets when the gateway controller detects less than 4.5 volts on the 5 volt sensor supply wire (5100 or 3930) while the key switch is in the run/enter position.
Common causes of M4622
- 5 volt supply wire (5100 or 3930, depending on model) shorted to ground
- Faulty seatbar sensor pulling the shared 5 volt supply down
- Faulty engine oil pressure sensor pulling the shared 5 volt supply down
- Internal fault in the gateway controller
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, seatbar sensor connector, engine oil pressure sensor connector, mainframe harness, or cab harness
- Intermittent loose connections, corrosion, pushed-back pins, controller fault, or harness fault, or a combination of these, if the code is not active at the time of testing
How to troubleshoot Bobcat M4622: first checks
- : Check for related codes M1122 (seatbar sensor out of range low) or M0613 (engine speed no signal) appearing at the same time, since these point toward the shared 5 volt supply as the common cause
- Inspect the seatbar sensor connector and the engine oil pressure sensor connector for moisture, corrosion, or pushed-back pins
- Inspect the gateway controller connectors and the mainframe and cab harness connectors along the 5 volt supply wire route for damage or corrosion
- With the key switch in run/enter, check the 5 volt supply wire (5100 or 3930 depending on model) for a short to ground
- Disconnect the seatbar sensor and the engine oil pressure sensor one at a time to see if removing either restores the 5 volt supply, which helps isolate which sensor is pulling the circuit down
- 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
How the code clears
M4622 is self resetting. No separate clearing step is listed once the wiring, sensor, or controller fault is repaired.
Affected models and serial ranges
M4622 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 M4622 mean?
It means the gateway controller detected less than 4.5 volts on the 5 volt sensor supply that feeds the seatbar sensor and the engine oil pressure sensor, while the key switch was in run/enter.
Is M4622 the same as the panel code 46-22?
Yes, 46-22 is the numeric panel display form of M4622 on Bobcat equipment.
Why would M4622 come with other codes?
Because the seatbar sensor and engine oil pressure sensor share the same 5 volt supply, a fault on that supply can also trigger M1122 (seatbar sensor out of range low) or M0613 (engine speed no signal) at the same time.
Can I keep operating the machine with M4622 active?
It is not recommended. The affected circuit feeds the seatbar safety interlock and the engine oil pressure sensor, so a low supply voltage can compromise operator safety monitoring and engine protection. Diagnose the cause before continued operation.
Does M4622 need a manual reset after repair?
No. It is listed as self resetting once the underlying wiring, sensor, or controller fault is corrected.
Which wire number should I check for M4622?
Check the 5 volt sensor supply wire, which is labeled 5100 on some models and 3930 on others. Confirm which wire number applies to your specific model before testing.
What if the code will not reproduce when I test it?
Treat it as intermittent. Bobcat lists loose connections, corrosion, pushed-back pins, the controller, and the wire harness, or a combination of these, as likely causes when the fault cannot be duplicated at the time of testing.