Bobcat H2806 (28-06) Fault Code: Rear Rod Lock Solenoid Short to Ground/Diverter Solenoid Short to Ground
Also shown on the panel as 28-06 · Also called Diverter Short to Ground, Diverter Solenoid Short To Ground, Diverter Solenoid Short to Ground, Diverter Solenoid Short to Ground, Rear Rod Lock Solenoid Short To Ground, Rear Rod Lock Solenoid Short to Ground, Rear Rod Lock Solenoid Short to Ground, Rear Rod Lock Solenoid Short to Ground\Diverter Solenoid Short to Ground
Rear Rod Lock Solenoid Short to Ground/Diverter Solenoid Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Bobcat fault code H2806 (panel form 28-06) sets when the auxiliary controller commands voltage on signal wire 4450 but does not detect it. Depending on the machine's configuration, this circuit controls either the diverter solenoid (directs hydraulic flow between front and rear auxiliary couplers) or the rear rod lock solenoid (stops flow from the rear rod couplers). It points to a short to ground somewhere in that shared signal wire or the components on it.
Medium severity. H2806 does not shut the machine down, but it disables control over an auxiliary hydraulic function (diverter routing or rear rod lock). If you rely on rear auxiliary couplers or attachments that use rod lock, treat this as a stop-and-check item before running that attachment. It is not an engine or structural safety issue by itself, but uncontrolled hydraulic flow direction on an attachment can be a hazard.
What does Bobcat error code H2806 mean?
Bobcat code H2806 means the auxiliary controller sent a command to energize a solenoid on signal wire 4450, but did not see the voltage it expected to see on that circuit. That tells the controller the circuit is likely shorted to ground rather than working normally.
On machines where this circuit runs the diverter solenoid, the affected function is routing hydraulic flow away from the front auxiliary couplers to the rear auxiliary couplers. On machines where it runs the rear rod lock solenoid, the affected function is stopping hydraulic flow out of the rear rod couplers. Some model variants describe the code as covering both descriptions together.
Either way, the underlying electrical problem is the same: a short to ground on wire 4450 or a fault in one of the solenoids or the controller tied to that circuit.
What triggers a Bobcat H2806 code?
The code sets when the key switch (run/enter) is on and the auxiliary controller commands the solenoid on signal wire 4450 but does not detect the expected voltage on that wire.
Common causes of H2806
- Signal wire 4450 shorted to ground
- Faulty diverter solenoid (on machines using the diverter description)
- Faulty rear rod lock solenoid (on machines using the rod lock description)
- Faulty rear base lock solenoid
- Faulty rear auxiliary relief solenoid
- Fault in the auxiliary controller itself
- Moisture, corrosion, or pushed-back pins in the auxiliary controller connectors, the affected solenoid connector, the rear auxiliary harness, or the mainframe harness
- Intermittent fault: if the code is not active at the time of testing, the cause may not be found immediately. Probable causes still include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these
How to troubleshoot Bobcat H2806: first checks
- With key switch on, check for the active code and note whether your machine's harness/manual ties H2806 to the diverter solenoid or the rear rod lock solenoid circuit, since wiring locations differ by configuration.
- Inspect the auxiliary controller connectors and the relevant solenoid connector (diverter, rear rod lock, rear base lock, or rear auxiliary relief) for moisture, corrosion, or pushed-back pins.
- Trace signal wire 4450 from the controller to the solenoid, checking for chafing, pinched insulation, or contact with ground at any point in the rear auxiliary harness or mainframe harness.
- Test the suspect solenoid coil for a short to ground rather than assuming the wire alone is at fault.
- If the code is intermittent, wiggle-test connectors and harness sections while watching for the fault to reappear, since an inactive code at the time of testing does not rule out a wiring or connector problem.
How the code clears
Bobcat lists cycling the key power as the step to clear H2806 once the repair is complete. There is no separate reset procedure beyond powering the machine off and back on after the short to ground has been found and corrected.
Affected models and serial ranges
H2806 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 ATZC11001-99999 |
| 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 A39511001-99999, 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 H2806 mean?
It means the auxiliary controller commanded voltage on signal wire 4450, which runs either the diverter solenoid or the rear rod lock solenoid depending on your machine, and did not detect that voltage. This points to a short to ground in that circuit.
What is the panel display number for H2806?
The numeric panel form is 28-06.
Will H2806 stop my Bobcat from running?
No. The code affects an auxiliary hydraulic function, either diverter routing between front and rear couplers or the rear rod lock, not the main drive or engine systems.
How do I clear H2806 after fixing it?
Cycle the key power off and back on. No separate reset procedure is listed for this code.
Why does the code come back even after I checked the wiring?
If the fault is intermittent, it may not be present when you test. Loose connections, corrosion, pushed-back pins, the controller, or the wire harness can all cause a code that is not consistently active.
Is H2806 the same on every Bobcat model?
The set condition (key switch on, no detected voltage on wire 4450) and clearing step (cycle power) are the same across affected models, but which solenoid the wire controls, diverter or rear rod lock, depends on the machine's configuration.
Which models can show H2806?
Bobcat lists this code across the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 skid steer and compact track loader models, plus T870.