Bobcat M1607 (16-07) Fault Code: Traction Lock Hold Solenoid Open Circuit
Also shown on the panel as 16-07
Traction Lock Hold Solenoid Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M1607 (panel display 16-07) sets when the gateway controller detects an open circuit on the traction lock hold solenoid, wire 4200. When this code is active, traction is disabled. The code only displays when the seatbar is raised, the parking brake switch is enabled, or the key switch / (run/enter) is cycled.
High severity. M1607 disables traction outright, which stops the machine from working until the open circuit is found and fixed. It is not an immediate safety emergency by itself, but a machine that cannot move is a productivity and safety issue on a job site, especially if it happens mid-task.
What does Bobcat error code M1607 mean?
The traction lock hold solenoid, wire 4200, is what keeps traction enabled after the operator gives a traction pull command. The gateway controller watches this circuit for an open. If it sees one, it disables traction as a protective response and sets M1607.
This means the fault is really a wiring and connection integrity check on the hold and ground path for that solenoid, not a complex sensor or software issue. The controller is simply reporting that the circuit it expects to be complete is not.
Because the code only displays under specific conditions (seatbar raised, parking brake switch enabled, or the key switch cycled), an operator may not see it appear immediately when the fault first happens. It can also be intermittent, showing up only under certain vibration, temperature, or connector movement conditions.
Common causes of M1607
- Hold wire 4200 or ground wire 2200 is open somewhere in the harness
- Traction lock solenoid itself has failed or is not making a good electrical connection
- Gateway controller fault
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the traction lock solenoid connector, or the mainframe harness
- Intermittent causes that may not be present at the time of testing, including loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems
How to troubleshoot Bobcat M1607: first checks
- Cycle the key switch / (run/enter) and check whether the code is still active or if it was an intermittent event
- Inspect the traction lock solenoid connector for moisture, corrosion, or pushed-back pins
- Trace and inspect wire 4200 (hold) and wire 2200 (ground) for continuity, chafing, or an open along the mainframe harness
- Check the gateway controller connectors for corrosion, moisture intrusion, or pushed-back pins
- Test the traction lock solenoid itself for proper operation and correct resistance/continuity
- If the code does not reappear during testing, treat it as intermittent and inspect all connections in the circuit rather than assuming no fault exists
How the code clears
Cycle power (turn the key switch off, then back on) once the repair is complete. No separate clearing step is listed beyond a power cycle.
Affected models and serial ranges
M1607 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 M1607 mean?
It means the gateway controller detected an open circuit on the traction lock hold solenoid, wire 4200. Because the controller can no longer confirm this solenoid circuit is complete, it disables traction until the fault is resolved.
Why did my Bobcat lose traction with no other warning?
Traction is disabled automatically by the controller when M1607 sets. The code display itself is conditional, it will only show on the panel when the seatbar is raised, the parking brake switch is enabled, or the key switch / (run/enter) is cycled, so the loss of traction may seem to happen before you see the code.
Can M1607 be an intermittent problem?
Yes. If the fault is not present when a technician is testing, the root cause may not be found right away. Likely intermittent causes include loose connections, corrosion, pushed-back pins, a failing controller, or wire harness issues, or a combination of these.
What wires are involved in M1607?
The circuit involves the hold wire, wire 4200, and the ground wire, wire 2200, for the traction lock hold solenoid. An open in either of these can trigger the code.
How do I clear M1607 after repairing it?
Cycle power on the machine by turning the key switch off and back on. No other clearing procedure is listed.
Which Bobcat models can get M1607?
This code applies to Bobcat S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, T770, and T870 models.
Is M1607 safe to ignore if the machine still drives sometimes?
No. Since M1607 disables traction when active, any driving after the fault sets is not expected behavior from that circuit. Have the wiring, solenoid, connectors, and controller inspected before relying on the machine for travel.