Bobcat H2805 (28-05) Fault Code: Rear Rod Lock Solenoid Short to Battery
Also shown on the panel as 28-05 · Also called Diverter Short to Battery, Diverter Solenoid Short To Battery, Diverter Solenoid Short to Battery, Diverter Solenoid Short to Battery, Rear Rod Lock Solenoid Short To Battery, Rear Rod Lock Solenoid Short to Battery
Rear Rod Lock Solenoid Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
H2805 (panel display 28-05) sets when the auxiliary controller sees voltage on signal wire 4450 for the diverter or rear rod lock solenoid when it did not command that circuit on. This points to a short to supply voltage somewhere in that wiring, a bad connector, or a controller fault.
Medium severity. H2805 does not itself indicate an immediate safety failure, but it means the auxiliary hydraulic controller cannot trust the state of the diverter or rear rod lock solenoid circuit. Attachments relying on the rear couplers or the front/rear diverter function may not behave as commanded until this is fixed.
What does Bobcat error code H2805 mean?
A code H2805 occurs when the auxiliary controller detects voltage on signal wire 4450, the circuit shared by the diverter solenoid and the rear rod lock solenoid, when the controller has not commanded that circuit on. In other words, the controller expects the wire to be at a low or off state and instead finds it powered.
On these machines, the diverter solenoid directs hydraulic flow away from the front auxiliary couplers to the rear auxiliary couplers, while the rear rod lock solenoid stops the flow of hydraulic fluid from the rear rod couplers. Because both functions share wire 4450 in Bobcat's descriptions of this code, a short to battery voltage on that wire will trigger H2805 regardless of which solenoid function is actually affected on a given machine.
This is a wiring integrity fault more than a mechanical failure. The controller is protecting the auxiliary hydraulic circuit from operating a solenoid it did not intend to energize, which could send hydraulic flow to the wrong coupler or fail to lock the rear rod as expected.
Common causes of H2805
- Signal wire 4450 shorted to supply voltage somewhere in the harness
- A fault in the auxiliary controller itself
- Moisture, corrosion, or pushed back pins in the auxiliary controller connectors, diverter solenoid connector, rear rod lock or rear auxiliary relief solenoid connector, rear auxiliary harness, or mainframe harness
- An intermittent short from loose connections, corrosion, pushed back pins, the controller, or the wire harness, alone or in combination, especially if the code is not active at the time of testing
How to troubleshoot Bobcat H2805: first checks
- Turn the key switch to run/enter, since this is the condition under which the controller monitors for the code, and confirm whether H2805 is currently active or was logged intermittently
- Inspect the auxiliary controller connectors for moisture, corrosion, or pins that have been pushed back out of place
- Inspect the diverter solenoid connector, rear rod lock solenoid connector, and rear auxiliary relief solenoid connector for the same issues
- Check the rear auxiliary harness and mainframe harness along the run of wire 4450 for chafing, pinches, or exposed wire that could short to a supply voltage source
- Test wire 4450 for a short to supply voltage with the key on and the diverter or rear rod lock command not active
- If the code will not reproduce, treat it as intermittent and recheck all connectors and harness sections rather than assuming no fault exists
How the code clears
Once the wiring or connector issue is repaired, or the controller replaced if that is the cause, cycle power to the machine to clear the code. No separate clearing step is listed beyond cycling power.
Affected models and serial ranges
H2805 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 H2805 mean?
It means the auxiliary controller found voltage on signal wire 4450, shared by the diverter solenoid and rear rod lock solenoid, when it had not commanded that circuit on. This usually points to a short to supply voltage in the wiring or a connector problem.
What is the panel display number for H2805?
The numeric panel form is 28-05.
Is H2805 the same as a diverter fault or a rear rod lock fault?
Bobcat's own descriptions vary by document. Some list H2805 as 'Diverter Short to Battery' and others as 'Rear Rod Lock Solenoid Short to Battery.' Both functions run through the same signal wire 4450, so the code covers either depending on which solenoid is wired into that circuit on your model.
Can I keep operating the machine with H2805 active?
The code does not describe an engine shutdown or interlock, but it means the controller cannot trust the diverter or rear rod lock circuit. Attachments that depend on directing flow to the rear couplers or locking the rear rod may not work as expected, so it should be diagnosed before relying on that function.
Why does the code come back after I clear it?
If the underlying short, corrosion, or pushed back pin was not actually repaired, cycling power will only clear the stored code temporarily. An intermittent short from loose connections or corrosion can also cause the code to reappear under vibration or moisture exposure even after a partial fix.
How do I clear H2805 after repair?
Cycle power to the machine. No separate clearing procedure beyond that is listed.
What if the code is intermittent and I can't find the fault?
Bobcat notes that if the code is not active at the time of testing, the cause may not be found immediately. Recheck all connectors and harness sections for loose connections, corrosion, and pushed back pins, since these are the most common intermittent causes along with the wire harness or controller itself.