Bobcat M1706 (17-06) Fault Code: Hydraulic Lock Solenoid Short to Ground
Also shown on the panel as 17-06 · Also called Hydraulic Lock Valve Short to Ground
Hydraulic Lock Solenoid Short to Ground · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M1706, shown as 17-06 on the panel, sets when the gateway controller cannot detect voltage on signal wire 4410 or return wire 2410 for the hydraulic lock valve solenoid when it is commanded. When this code is active, the lift and tilt functions are disabled.
High severity. The machine disables lift and tilt when M1706 is active, so the loader cannot perform normal work until the fault is found and cleared. It is not an engine-damage code, but it stops productive use of the machine and should be diagnosed before returning to work.
What does Bobcat error code M1706 mean?
M1706 relates to the hydraulic lock valve solenoid, the component that locks and unlocks the lift and tilt hydraulic functions on many Bobcat loaders. The gateway controller sends a command to this solenoid and expects to see proper voltage on the signal wire (4410) and return wire (2410). If it does not detect that voltage when it commands the solenoid, it sets M1706.
Because the hydraulic lock function is tied directly to whether lift and tilt are allowed to move, this code causes those functions to shut down as a protective measure. This is by design, since the controller cannot verify the lock valve is behaving as commanded, so it will not risk uncontrolled boom or bucket movement.
This code applies across a wide range of skid steer and compact track loader models, including the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, and T870.
Common causes of M1706
- Signal wire 4410 or return wire 2410 shorted to ground.
- Faulty hydraulic lock valve solenoid.
- Faulty gateway controller.
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the hydraulic lock solenoid connector, or the mainframe harness.
- Intermittent fault: if the code is not active at the time of testing, the root cause may not be found immediately. Probable underlying issues include loose connections, corrosion, pushed-back pins, the controller itself, the wire harness, or a combination of these problems.
How to troubleshoot Bobcat M1706: first checks
- With the key switch/run-enter position on, check for the active code and note whether it is currently present or was only logged intermittently.
- Inspect the hydraulic lock valve solenoid connector and the gateway controller connectors for moisture, corrosion, or pins that have pushed back out of place.
- Trace signal wire 4410 and return wire 2410 for any chafing, pinching, or contact with metal or ground points that could cause a short to ground.
- Check the mainframe harness along its run for damage, loose connectors, or corrosion, since this is called out as a shared cause point.
- If the code will not reproduce during testing, treat it as intermittent and inspect all connection points listed above rather than assuming no problem exists.
How the code clears
Cycle power to clear the code once the repair is complete. No separate clearing step is listed beyond a power cycle, so after repairs are made, turn the key off, wait, and restart to confirm the code does not return and that lift and tilt function normally.
Affected models and serial ranges
M1706 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-ATZC99999 |
| 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 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 M1706 mean?
It means the gateway controller commanded the hydraulic lock valve solenoid but did not detect voltage on signal wire 4410 or return wire 2410. This disables the lift and tilt functions until the fault is resolved.
Why are my lift and tilt functions not working with M1706 active?
The hydraulic lock valve solenoid controls whether lift and tilt are locked or unlocked. When the controller cannot confirm proper voltage on the solenoid's signal or return wire, it disables lift and tilt as a safety measure rather than allow uncertain hydraulic lock behavior.
What is the numeric panel code for M1706?
On the numeric display it shows as 17-06.
Which Bobcat models can show M1706?
It is listed for the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 loaders.
How do I clear M1706 after a repair?
Cycle power (turn the key off and back on) after the repair is finished. No other clearing procedure is listed for this code.
Can M1706 be an intermittent problem?
Yes. If the code is not active when you test the machine, the cause may not be immediately identifiable. Likely culprits in an intermittent case include loose connections, corrosion, pushed-back pins, the controller, or the wiring harness, alone or in combination.
Where should I look first when troubleshooting M1706?
Start with the connectors: the gateway controller connectors, the hydraulic lock solenoid connector, and the mainframe harness, checking for moisture, corrosion, or pins pushed back out of their sockets. Then check wires 4410 and 2410 for a short to ground.