Bobcat M0216 (02-16) Fault Code: Hydraulic Implement Filter Not Connected
Also shown on the panel as 02-16 · Also called Hydraulic/Hydrostatic Filter Not Connected
Hydraulic Implement Filter Not Connected · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M0216 (panel code 02-16) sets when the Bobcat gateway controller sees an open circuit for 30 seconds on the hydraulic implement filter switch signal wire (3320 on some models, 3430 on others) with the key switch/(run/enter) on and the engine not running. It usually means a wiring, connector, or switch fault rather than an actual filter bypass event.
Medium severity. M0216 is not an immediate stop-work code by itself since it is checked with the engine off, but it points to a break in the circuit that monitors hydraulic implement filter bypass. Ignoring it means you lose the warning that would tell you the filter is bypassing dirty oil into the hydraulic implement system, so get it diagnosed before heavy hydraulic work.
What does Bobcat error code M0216 mean?
,M0216 is set by the gateway controller when it detects an open circuit for 30 seconds on the hydraulic implement filter switch signal wire, with the key switch/(run/enter) on and the engine not running. Depending on the machine's wiring variant, that signal wire is either 3320 (with a separate ground wire 2320) or 3430 (a one-wire switch that grounds itself through the filter housing, known as case grounding).
The hydraulic implement filter switch itself is a normally closed switch mounted to the back of the filter assembly. It is designed to open only when hydraulic pressure through the implement filter reaches a critical level, which is the point where the filter would start bypassing unfiltered oil around itself to keep hydraulic flow going. In other words, the switch is meant to warn you the filter is clogged enough that dirty oil is bypassing it.
Because the code is checked at key on with the engine off, it can also appear once the engine is running if the open circuit was already present before startup. That means an intermittent wiring problem can carry the code into engine operation even though the fault condition itself is only tested during the off-engine check.
Common causes of M0216
- Open in signal wire 3320 or its ground wire 2320 (wiring variant A)
- Open in signal wire 3430, or poor grounding of the switch through the filter housing since it is case grounded (wiring variant B)
- A failed hydraulic implement filter switch
- A fault in the gateway controller itself
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the hydraulic implement filter switch connector, or the mainframe harness
- An intermittent condition where loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these are the probable cause but the fault is not present at the time of testing
How to troubleshoot Bobcat M0216: first checks
- Confirm the key switch/(run/enter) is on and the engine is not running, since these are the conditions under which the code is checked
- Inspect the hydraulic implement filter switch connector and the mainframe harness connectors at the gateway controller for moisture, corrosion, or pushed-back pins
- Trace signal wire 3320 (and ground wire 2320 on that wiring variant) or signal wire 3430 (case-grounded variant) for an open circuit, chafe point, or loose terminal
- Check the physical mounting and wiring of the hydraulic implement filter switch on the back of the filter assembly for a damaged or disconnected connector
- Test the hydraulic implement filter switch itself for proper normally closed operation
- If the code will not reproduce during testing, treat it as intermittent: recheck all connections, look for corrosion, and inspect the harness and controller connectors closely since the cause may not be found on the first pass
How the code clears
M0216 is self resetting. No separate clearing step is listed beyond repairing the open circuit, connector, switch, or controller fault that triggered it. Once the controller no longer sees the open condition, the code clears on its own.
Affected models and serial ranges
M0216 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 M0216 mean?
It means the gateway controller detected an open circuit for 30 seconds on the hydraulic implement filter switch signal wire, checked with the key switch/(run/enter) on and the engine not running. It is listed as 'Hydraulic Implement Filter Not Connected' or 'Hydraulic/Hydrostatic Filter Not Connected' depending on the manual.
Can I keep operating my Bobcat with M0216 active?
The code itself is a wiring/switch monitoring fault, not proof the filter is actually bypassing. But since it disables your warning for an actual filter bypass condition, it should be diagnosed before you rely on the machine for extended hydraulic work.
Why does M0216 show up even after I've started the engine?
If the open circuit was present before the engine was started, the code can carry over and appear while the engine is running, even though the controller only checks this circuit at key on with the engine off.
Is M0216 the same wiring on every Bobcat model?
No. Some models use signal wire 3320 with a separate ground wire 2320, while others use a one-wire, case-grounded switch on signal wire 3430. Check your model's wiring diagram to know which variant applies.
What is the hydraulic implement filter switch actually doing?
It's a normally closed switch on the back of the filter assembly. It opens only when pressure through the filter reaches a critical level, which is the point where the filter would start bypassing oil around itself. M0216 fires when the controller can't see a closed circuit from that switch.
Does M0216 need a manual reset or scan tool clear?
No. It's listed as self resetting, so once the open circuit is repaired, the code clears on its own without a separate procedure.
What's the first thing a tech should check for M0216?
Start with the switch connector and the mainframe harness connectors at the gateway controller, looking for corrosion, moisture, or pushed-back pins, then trace the specific signal wire for your model's wiring variant.