Bobcat M0117 (01-17) Fault Code: Air Filter Plugged
Also shown on the panel as 01-17
Air Filter Plugged · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M0117, shown as 01-17 on the panel, sets when the gateway controller sees the air filter switch circuit (signal wire 3150 or 3700, depending on model) open for 30 seconds while the engine is running. This normally-closed switch is mounted on the back of the air filter and opens when vacuum from airflow through the filter reaches a critical level, meaning the filter is likely restricted or the switch/wiring has failed open.
Medium severity. A plugged air filter reduces engine airflow and can lead to power loss or increased engine wear if ignored, but it is not an immediate stop-the-machine emergency unless the restriction is severe. Diagnose within the shift, and don't keep running the machine hard if you suspect a heavily clogged filter.
What does Bobcat error code M0117 mean?
M0117 (panel code 01-17) is Bobcat's 'Air Filter Plugged' fault. The air filter switch is a normally closed switch mounted to the back of the air filter housing. As airflow through the filter element increases resistance (from dirt/debris buildup), vacuum on the clean side of the filter increases. Once that vacuum reaches a critical level, the switch is designed to open.
The gateway controller monitors this switch circuit while the engine is running: signal wire 3150 (with ground wire 2150) on some models, or signal wire 3700 (with ground wire 3710) on others. If the controller sees that circuit open continuously for 30 seconds, it sets M0117.
Because the switch is normally closed, an open circuit can mean either a genuinely restricted air filter doing its job, or a wiring/connector/switch problem making the controller think the filter is restricted when it isn't. Both possibilities need to be checked.
What triggers a Bobcat M0117 code?
The code sets when the gateway controller detects the air filter switch signal circuit (wire 3150/ground 2150, or wire 3700/ground 3710, depending on model) open continuously for 30 seconds while the key switch is in run/enter and the engine is running.
Common causes of M0117
- Air filter itself: dirty or plugged element causing the switch to open as designed.
- Signal wire 3150 or ground wire 2150 open (or, on other models, signal wire 3700 or ground wire 3710 open).
- Faulty air filter switch (stuck open or failed).
- Gateway controller fault.
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, air filter switch connector, or mainframe harness.
- Intermittent fault: if the code is not active at the time of testing, the cause may not be found immediately. Probable contributors include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these.
How to troubleshoot Bobcat M0117: first checks
- Confirm the actual condition: key switch/run-enter on, engine running. These are required for the code to set, so verify the machine was in that state when the fault logged.
- Inspect the air filter element for visible dirt, blockage, or damage; replace or clean per your service interval if restricted.
- Check the air filter switch itself for proper operation: confirm it is normally closed when the filter is clean and opens only under high vacuum.
- Trace and inspect signal wire 3150/ground 2150 (or 3700/ground 3710, depending on your model) for open circuits, chafing, or damage.
- Inspect the gateway controller connectors, the air filter switch connector, and the mainframe harness connectors for moisture, corrosion, or pushed-back pins.
- If the code was intermittent and isn't currently active, wiggle-test connectors and harness sections while monitoring for the fault to reappear, since the root cause may not be found on a single static check.
How the code clears
After completing the repair, clear the code by cycling power (turning the key off and back on). There is no other clearing procedure listed for M0117.
Affected models and serial ranges
M0117 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 M0117 mean?
It means the gateway controller detected the air filter switch signal circuit open for 30 seconds while the engine was running, which normally indicates the air filter is restricted enough that vacuum has reached a critical level and opened the normally closed switch, though it can also be caused by a wiring or switch fault.
What is the panel display version of M0117?
On the Bobcat display, M0117 shows as the numeric code 01-17.
Is M0117 the same on every Bobcat model?
The logic is the same, but the wiring differs by model: some use signal wire 3150 and ground wire 2150, while others use signal wire 3700 and ground wire 3710. Check your specific model's wiring to know which circuit to test.
Can a bad wire or connector cause M0117 even with a good air filter?
Yes. Since the switch is normally closed, an open signal or ground wire, a faulty switch, corrosion, or pushed-back pins in the connectors can all mimic a plugged filter and set the code even if the filter itself is fine.
How do I clear M0117 after fixing it?
Cycle the key power off and back on. That is the only clearing method listed for this code.
What should I check first if I get an air filter plugged code?
Start with the air filter element itself. Look for visible dirt or restriction, then check the switch and its wiring/connectors for corrosion, looseness, or pushed-back pins if the filter looks fine.
What if the code appears intermittently and isn't active when I test it?
That's expected with wiring-related faults. With an intermittent fault the root cause may not show up on a single static check; suspect loose connections, corrosion, pushed-back pins, the controller, or the harness. Try wiggle-testing connectors while watching for the fault to return.