Bobcat H2906 (29-06) Fault Code: High Flow Solenoid Short to Ground
Also shown on the panel as 29-06 · Also called High Flow Solenoid Short To Ground, High Flow Solenoid Short to Ground, High-Flow Short to Ground
High Flow Solenoid Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
H2906 (panel form 29-06) sets when the auxiliary controller commands the high flow solenoid but does not detect voltage on signal wire 4460 or return wire 2460. It means the high flow circuit, which adds high flow pump output to the normal auxiliary flow when front base auxiliaries are engaged, has a short to ground or a wiring/connector/controller fault.
Medium severity. H2906 does not disable base machine function, but it will disable high flow attachment operation until the short is found and repaired. Treat it as a diagnose-this-shift item, especially if you rely on high flow attachments for the job.
What does Bobcat error code H2906 mean?
H2906 occurs when the auxiliary controller commands the high flow solenoid on but does not detect voltage on signal wire 4460 or return wire 2460. That tells the controller the circuit is not behaving as expected, most likely because it is shorted to ground somewhere between the controller and the solenoid.
The high flow solenoid's job is to let output from the high flow pump join the normal auxiliary flow. This only happens when the front base auxiliaries are engaged. If the solenoid circuit is faulted, the machine will not be able to add that extra flow, which affects attachments that need high flow to work correctly.
This is a controller-detected wiring/component fault code, not a pressure or temperature fault. It is about the electrical health of the solenoid circuit itself.
Common causes of H2906
- Signal wire 4460 or return wire 2460 shorted to ground
- Faulty high flow solenoid
- Faulty auxiliary controller
- Moisture, corrosion, or pushed-back pins in the auxiliary controller connectors, high flow solenoid connector, or the mainframe harness
- Intermittent fault that may not be present at the time of testing, possibly from loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these
How to troubleshoot Bobcat H2906: first checks
- With key switch / (run/enter) on, check for the code and see if it is active or intermittent
- Inspect the high flow solenoid connector and the auxiliary controller connectors for moisture, corrosion, or pushed-back pins
- Trace signal wire 4460 and return wire 2460 for chafing, pinches, or contact with ground points, especially anywhere they run through the mainframe harness
- Check the high flow solenoid itself for an internal short to ground
- Check the auxiliary controller connectors and wiring for looseness or damage
- If the code is intermittent, wiggle-test connectors and harness sections while watching for the fault to reappear, since the cause may not show up on a static check
How the code clears
Cycle power after completing repairs. No separate clearing step is listed beyond a power cycle.
Affected models and serial ranges
H2906 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 A3NT10001-12369, 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 H2906 mean?
It means the auxiliary controller commanded the high flow solenoid on but did not see the expected voltage on signal wire 4460 or return wire 2460, most likely due to a short to ground in that circuit.
Will H2906 stop my machine from running?
No, but it will prevent the high flow circuit from adding high flow pump output to the auxiliary flow, so high flow attachments will not get the extra flow they need.
What is the panel number for this code?
H2906 displays in numeric panel form as 29-06.
What wires and components are involved in H2906?
The circuit includes signal wire 4460, return wire 2460, the high flow solenoid, the auxiliary controller, and the connectors and mainframe harness that link them.
Why does H2906 come and go instead of staying on?
If corrosion, a loose connection, or a pushed-back pin only causes an intermittent short, the code may not be present when you check it. Wiggle-testing connectors and harness sections while watching for the fault is the practical way to catch it.
How do I clear H2906 after fixing the problem?
Cycle power. No other clearing procedure is listed for this code.
Which Bobcat models can show H2906?
S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, and T870.