Bobcat H2305 (23-05) Fault Code: Rear Base Solenoid Shorted to Battery
Also shown on the panel as 23-05 · Also called Rear Base Output Short to Battery
Rear Base Solenoid Shorted to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
H2305 (panel code 23-05) sets when the auxiliary controller sees battery voltage on the rear base solenoid signal wire 4440 when it has not commanded that output on. The rear base function is disabled until the fault clears. It affects rear auxiliary hydraulic flow through the rear female coupler.
Medium severity. The machine keeps running and driving normally, but the rear base hydraulic function is disabled, which stops any attachment relying on that circuit. Not an immediate safety emergency, but it takes an attachment out of service until diagnosed.
What does Bobcat error code H2305 mean?
H2305 is set by the auxiliary controller on Bobcat skid-steer and track loader models when it detects battery voltage present on signal wire 4440, the wire that controls the rear base solenoid, at a time when the controller itself did not command that circuit on.
The rear base solenoid is responsible for directing hydraulic flow to the rear auxiliary female coupler, which powers attachments connected at the rear of the machine. When the controller sees this unexpected voltage, it treats the output as shorted to battery power and shuts the rear base function down as a protective measure.
Because the fault disables the rear base output entirely, any attachment depending on that hydraulic circuit will stop working until the wiring, solenoid, or controller issue is found and fixed.
Common causes of H2305
- Signal wire 4440 shorted to battery voltage.
- Return wire 2440 shorted to supply voltage, or shorted to signal wire 4440.
- A failed rear base solenoid.
- A fault in the auxiliary controller itself.
- Moisture, corrosion, or pushed-back pins in the auxiliary controller connectors, the rear base solenoid connector, or the mainframe harness.
- Intermittent connection issues (loose connections, corrosion, pushed-back pins, controller, or wire harness problems) that may not show up if the code isn't active at the time of testing.
How to troubleshoot Bobcat H2305: first checks
- Confirm the key switch is in the run/enter position, since this is the condition under which the code is set and checked.
- Visually inspect the auxiliary controller connectors, the rear base solenoid connector, and the mainframe harness connectors for moisture, corrosion, or pins that have been pushed back out of their sockets.
- Check signal wire 4440 for signs of chafing, pinching, or contact with a constant battery-voltage source that could cause a short.
- Check return wire 2440 for a short to supply voltage or to signal wire 4440 itself.
- Test the rear base solenoid for proper operation and resistance, since a failed solenoid is a listed possible cause.
- If the code is not currently active, treat it as possibly intermittent and recheck all connectors and harness sections carefully, since intermittent faults may not reproduce on demand.
- If wiring and solenoid check out, suspect the auxiliary controller itself as the source of the fault.
How the code clears
Cycle power to the machine after completing repairs. No other reset procedure is listed for this code.
Affected models and serial ranges
H2305 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 H2305 mean?
It means the auxiliary controller detected battery voltage on the rear base solenoid signal wire (wire 4440) when it did not command that circuit on. This is read as a short to battery, and the controller disables the rear base output in response.
What is the panel display number for H2305?
On the display panel, this code appears in numeric form as 23-05.
Will my attachment still work with H2305 active?
No. Once H2305 sets, the rear base function is disabled, so any attachment relying on hydraulic flow through the rear auxiliary female coupler will not operate until the fault is fixed.
What usually causes this fault?
The most common causes are a short between signal wire 4440 and battery voltage, a short involving return wire 2440, a failed rear base solenoid, moisture or corrosion in connectors, or a fault in the auxiliary controller itself.
How do I clear H2305 after fixing the problem?
Cycle the key switch or machine power off and back on. No additional reset steps are listed.
Which Bobcat models can show this code?
H2305 applies to S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 models, among others listed for this code.
The code isn't showing right now, does that mean it's fixed?
Not necessarily. H2305 can be intermittent. If it isn't active during testing, the underlying cause, such as a loose connection, corrosion, or pushed-back pin, may still be present and could return.