Bobcat M0511 (05-11) Fault Code: Hydraulic Charge Pressure Extremely High
Also shown on the panel as 05-11
Hydraulic Charge Pressure Extremely High · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M0511 (panel code 05-11) sets when Bobcat's gateway controller sees a signal from the hydraulic charge pressure sensor reading above the extremely high pressure limit for the machine model for 5 seconds. It most often points to a misadjusted charge relief valve, but sensor, wiring, or controller faults can also trigger it.
High severity. This code flags charge pressure well above the normal operating range. Running the machine with an over-pressurized charge circuit risks damage to hydraulic pump components and seals over time. It is not an immediate shutdown emergency, but it should be diagnosed before continued heavy use.
What does Bobcat error code M0511 mean?
M0511 is Bobcat's code for Hydraulic Charge Pressure Extremely High, shown on the panel as 05-11. The charge pump keeps the main hydraulic pump supplied with oil and maintains a baseline pressure in the hydrostatic drive circuit. If that pressure climbs far above what's expected for the machine, the gateway controller logs this fault.
The controller watches a dedicated charge pressure sensor. Depending on the machine's wiring configuration, this sensor is wired through wire 3190 or wire 3420. When the controller sees a signal from that sensor indicating pressure above the extremely high threshold set for that specific model, continuously for 5 seconds, it sets M0511.
Bobcat notes this code is most likely to appear when the charge relief valve has been misadjusted, letting pressure build past the normal ceiling. Sensor, wiring, or controller problems are also possible, especially if the code appears intermittently.
What triggers a Bobcat M0511 code?
The code sets when the gateway controller reads a hydraulic charge pressure sensor signal above the extremely high pressure specification for that machine model, sustained for 5 seconds. This check is only active when the key switch (run/enter) is on, the engine is running, and hydraulic oil temperature is above 100°F (38°C). The exact pressure threshold varies by machine model and is not given as a single number.
Common causes of M0511
- Misadjustment of the charge relief valve, the most likely cause according to Bobcat
- Fault in the 8-volt supply wire to the sensor (wire 5190 on some machines, wire 3400 on others)
- Fault in the sensor ground wire (wire 2190 on some machines, wire 3410 on others)
- Failed or faulty hydraulic charge pressure sensor
- Failed gateway controller
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the charge pressure sensor connector, or the mainframe wire harness
- Intermittent causes that may not show up during testing if the code isn't active, including loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these
How to troubleshoot Bobcat M0511: first checks
- Confirm the fault is present: key switch on, engine running, and hydraulic oil above 100°F (38°C), since the check only runs under these conditions
- Inspect the charge relief valve setting and compare it against the spec for your exact model, since misadjustment is the most common cause
- Visually inspect the hydraulic charge pressure sensor connector and the gateway controller connectors for moisture, corrosion, or pushed-back pins
- Check the condition of the mainframe wire harness between the sensor and the controller for chafing, pinched sections, or loose connections
- Verify the 8-volt supply wire to the sensor (wire 5190 or wire 3400 depending on wiring configuration) for proper voltage and no shorts
- Check the sensor ground wire (wire 2190 or wire 3410 depending on wiring configuration) for a solid, clean ground
- If the code only appears intermittently, recheck all connectors and harness sections carefully since the root cause may not show up during a static test
How the code clears
M0511 is self resetting. No separate clearing step is listed. Once the underlying cause, such as a misadjusted charge relief valve or a bad connection, is corrected and charge pressure reads within normal range under the same test conditions, the code should clear on its own.
Affected models and serial ranges
M0511 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 M0511 mean?
It means the gateway controller detected a signal from the hydraulic charge pressure sensor showing pressure above the extremely high limit for your machine model, held for 5 seconds. It's most often caused by a misadjusted charge relief valve.
Is M0511 the same as panel code 05-11?
Yes. 05-11 is the numeric panel display form of fault code M0511 on affected Bobcat machines.
Can I keep operating with M0511 active?
It's not an instant shutdown code, but sustained high charge pressure can damage pump components and seals over time. Get the charge relief valve setting and sensor circuit checked before continued heavy use.
Why does M0511 only show up when the machine is warm?
The set conditions require hydraulic oil temperature above 100°F (38°C), along with the key switch on and the engine running. If the oil hasn't warmed up, the controller won't evaluate for this fault.
Do I need to manually clear M0511 after a repair?
No. Bobcat lists this code as self resetting, so no separate clearing procedure is needed once the cause is fixed and pressure returns to normal.
Which Bobcat machines can show M0511?
It applies to Bobcat S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 skid-steer and track loader models, along with the T870.
What wiring is involved in M0511?
Depending on the machine's wiring setup, the sensor circuit uses either wire 3190 with 8-volt supply wire 5190 and ground wire 2190, or wire 3420 with 8-volt supply wire 3400 and ground wire 3410.