Bobcat H2406 (24-06) Fault Code: Rear Rod Solenoid Short to Ground
Also shown on the panel as 24-06 · Also called Rear Rod Output Short to Ground, Rear Rod Solenoid Short To Ground, Rear Rod Solenoid Short to Ground
Rear Rod Solenoid Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
H2406 (panel code 24-06) sets when the Bobcat auxiliary controller commands the rear rod solenoid but does not detect voltage on signal wire 4430 or return wire 2430. The controller treats this as a short to ground and disables the rear rod solenoid until the fault is cleared and power is cycled.
Medium severity. The rear rod solenoid is disabled once this code sets, so that specific auxiliary function stops working. It is not an engine-damage or safety-shutdown event, but it will stop you from running attachments that rely on rear rod flow until it's fixed.
What does Bobcat error code H2406 mean?
H2406 is set by the auxiliary controller on Bobcat loaders and compact track loaders when it commands the rear rod solenoid to energize but does not see the expected voltage return on wire 4430 (signal) or wire 2430 (return). The controller interprets this as a short to ground somewhere in that circuit.
The rear rod solenoid controls hydraulic flow direction through the rear auxiliary male coupler, which feeds attachments connected to the rear auxiliary hydraulic hookup. When H2406 is active, the controller disables the rear rod solenoid outright, so that function will not operate until the fault is resolved.
This code affects a wide range of Bobcat skid-steer and track loader models, including the S510 through S770 series and the T550 through T870 series.
Common causes of H2406
- Signal wire 4430 or return wire 2430 shorted to ground somewhere between the auxiliary controller and the rear rod solenoid.
- A failed rear rod solenoid itself.
- A fault inside the auxiliary controller.
- Moisture, corrosion, or pushed-back pins in the auxiliary controller connectors, the rear rod solenoid connector, or the mainframe harness connectors.
- Intermittent issues from loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these, which may not show up if the code isn't active at the time of testing.
How to troubleshoot Bobcat H2406: first checks
- Confirm the key switch is in the run/enter position, that rear auxiliaries are enabled, and that a rear rod command is actually being given, since these are the conditions under which the controller checks this circuit.
- Inspect the rear rod solenoid connector and the auxiliary controller connectors for moisture, corrosion, or pins that have been pushed back out of position in the connector body.
- Trace signal wire 4430 and return wire 2430 through the mainframe harness looking for chafed insulation, pinch points, or contact with ground.
- Check the rear rod solenoid coil itself for a short to ground using a multimeter with the connector disconnected.
- If the code is not active during testing, treat it as intermittent and recheck all connections, since the cause may not be found unless the fault is present at the time of the check.
How the code clears
Once the repair is complete, the documented step is to cycle key power. No separate reset procedure or scan tool clearing step is listed for this code.
Affected models and serial ranges
H2406 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 H2406 mean?
It means the auxiliary controller commanded the rear rod solenoid on but did not detect the expected voltage on signal wire 4430 or return wire 2430, so it assumes there's a short to ground in that circuit and disables the solenoid.
What is the panel display version of H2406?
On the Bobcat display it shows as 24-06, which is the same fault as H2406 in the diagnostic code list.
Will my attachment still work with H2406 active?
The rear rod solenoid is disabled when this code is active, so any attachment function that relies on hydraulic flow directed through the rear auxiliary male coupler via that solenoid won't operate until the fault is fixed.
Which Bobcat machines can get an H2406 code?
It's listed across a wide range of skid-steer and compact track loader models, including S510, S530, S550, S570, S590, S630, S650, S750, S770, and the T550 through T870 track loader lineup.
How do I clear H2406 after I fix it?
Cycle the key power off and back on. No other reset or clearing procedure is documented for this code.
Why does H2406 come and go instead of staying on?
Intermittent H2406 codes are usually caused by loose connections, corrosion, or pushed-back pins that only create a short under certain vibration, movement, or moisture conditions. If the fault isn't active when you test, you may not be able to pin down the exact cause on that visit.
Where should I start looking for the short?
Start with the connectors: the rear rod solenoid connector, the auxiliary controller connectors, and the mainframe harness connections, checking for corrosion, moisture, and pins pushed back out of place before moving on to wire tracing.