Bobcat H2705 (27-05) Fault Code: Front Rod Solenoid Short to Battery
Also shown on the panel as 27-05 · Also called Front Rod Output Short to Battery, Front Rod Solenoid Short To Battery, Front Rod Solenoid Short to Battery
Front Rod Solenoid Short to Battery · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
H2705, shown as 27-05 on the panel, means the auxiliary controller (or deluxe MX controller on some machines) sees battery voltage on the front rod solenoid signal wire when it should not be there. The front rod solenoid gets disabled until the fault is cleared, which cuts off hydraulic flow through the front auxiliary male coupler.
Medium severity. The machine is not in immediate danger, but the front auxiliary hydraulic function on the front coupler is disabled until this is fixed. If you rely on front-mount attachments for the job at hand, this is a stop-and-diagnose issue rather than something to run past.
What does Bobcat error code H2705 mean?
Code H2705 sets when the controller responsible for auxiliary hydraulics, either the standard auxiliary controller or the deluxe MX controller depending on model, detects battery voltage present on the front rod solenoid signal wire (wire 4330 on most systems, wire 4110 on deluxe MX systems) when that solenoid has not been commanded on.
The front rod solenoid's job is to direct hydraulic flow through the front auxiliary male coupler, which is what powers many front-mounted attachments. Because the controller cannot trust a signal that is unexpectedly hot, it shuts the front rod solenoid down as a protective measure. That means loss of that specific hydraulic function until the fault is diagnosed and the code is cleared.
This code applies across a wide range of Bobcat skid-steer and compact track loader models including the E35, E45, S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 lines, with the wiring and controller involved varying slightly by model and equipment level.
Common causes of H2705
- Signal wire 4330 (or 4110 on deluxe MX-equipped machines) shorted to battery voltage.
- Return wire 2330 (or 2110 on deluxe MX systems) shorted to supply voltage, or shorted together with the signal wire.
- A failed front rod solenoid.
- A failed auxiliary controller or deluxe MX controller.
- Moisture, corrosion, or pushed-back pins in the auxiliary controller connectors, front rod solenoid connector, mainframe harness, or (on deluxe MX machines) the deluxe MX power or control harness.
- Intermittent causes that may not show up during testing: loose connections, corrosion, pushed-back pins, a marginal controller, harness damage, or some combination of these.
How to troubleshoot Bobcat H2705: first checks
- Verify the key switch is in the run/enter position, since that is the operating condition under which this code is set and monitored.
- Inspect the front rod solenoid connector and the mainframe harness connectors for moisture, corrosion, or pins that have been pushed back out of their seats.
- Check signal wire 4330 (or 4110 on deluxe MX machines) for a short to battery voltage, and check return wire 2330 (or 2110) for a short to supply voltage or to the signal wire itself.
- Inspect the auxiliary controller or deluxe MX controller connectors for the same moisture, corrosion, or pushed-back pin issues found on the solenoid side.
- Test the front rod solenoid itself for an internal short before condemning the controller.
- If the code is not active at the time of testing, treat it as intermittent and pay extra attention to loose connections, corrosion, and harness chafing along the mainframe, since these are the most likely intermittent culprits.
How the code clears
Once the wiring, connector, solenoid, or controller issue is repaired, clear the code by cycling key power off and back on. No separate reset procedure is listed for this code beyond a power cycle.
Affected models and serial ranges
H2705 appears in our records across 18 Bobcat models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| E35 | SN A93K110001-99999, SN AC2P11001-99999 |
| E45 | SN AHHC11001-99999 |
| 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 H2705 mean?
It means the auxiliary controller detected battery voltage on the front rod solenoid signal wire when that solenoid was not being commanded on. The controller disables the front rod solenoid in response, which stops hydraulic flow through the front auxiliary male coupler.
What is the panel display number for H2705?
On the numeric panel display, this code shows as 27-05.
Will H2705 stop my Bobcat from running?
No, the machine itself keeps running. What gets disabled is the front rod solenoid, meaning any attachment relying on flow through the front auxiliary male coupler will not function correctly until the fault is fixed.
What usually causes H2705?
Most cases trace back to a short to battery voltage on the signal wire, a short involving the return wire, a bad front rod solenoid, a controller fault, or corrosion and pushed-back pins in the connectors. Intermittent cases are often connection or harness related.
How do I clear code H2705 after fixing it?
Cycle the key power off and back on. No other clearing procedure is listed.
Does the wire numbering change by model?
Yes. Standard auxiliary controller systems reference signal wire 4330 and return wire 2330, while machines with the deluxe MX controller reference signal wire 4110 and return wire 2110. The fault logic and front rod solenoid function are the same either way.
Which Bobcat models can show H2705?
It applies to the E35, E45, S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 models.