Bobcat M1507 (15-07) Fault Code: Traction Lock Pull Output Open Circuit
Also shown on the panel as 15-07
Traction Lock Pull Output Open Circuit · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M1507 (panel code 15-07) means the gateway controller has detected an open circuit on the traction lock relay output, wire 4110. When this happens the controller disables traction so the machine will not drive until the fault is fixed.
High severity. Traction is disabled whenever this code is active, so the machine cannot be driven until the fault is cleared. It is not a fire or injury risk by itself, but it stops work and should be diagnosed before returning the machine to service.
What does Bobcat error code M1507 mean?
M1507 sets when the gateway controller sends a command to energize the traction pull relay through wire 4110, and the controller does not see the expected electrical response, meaning it reads the circuit as open. This output wire is what tells the traction lock relay to allow traction, so when the controller can't confirm the circuit is closed, it disables traction as a safety default.
In practical terms, this is an electrical fault in the wiring, connectors, relay, or the gateway controller itself, not a mechanical drivetrain failure. The traction lock relay and its wiring have to be electrically sound for the machine to drive at all.
Because the fault disables traction outright, the operator will typically notice the machine simply will not move or will not respond to drive commands, along with the fault code appearing on the display.
Common causes of M1507
- Controller output wire 4110 shorted to supply voltage or open
- Ground wire 2025 open (some models) or ground wire 2050/2060 open (other models)
- Faulty traction lock relay
- Faulty gateway controller
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, traction lock relay connectors, or the mainframe harness
- Intermittent fault not present at time of testing: possible causes include loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems
How to troubleshoot Bobcat M1507: first checks
- With key switch on, press-to-operate loader (PTOL) engaged, and engine running (the conditions under which this code sets), check for the code being active or historical
- Inspect wire 4110 for signs of chafing, shorting to supply voltage, or an open circuit between the gateway controller and the traction lock relay
- Check the ground wire path (2025 on some models, 2050/2060 on others) for continuity and a solid ground connection
- Inspect the gateway controller connectors and the traction lock relay connectors for moisture, corrosion, or pins that have been pushed back out of their sockets
- Inspect the mainframe harness along its run for chafe points, pinches, or corrosion
- If the code does not reappear during testing, treat it as intermittent and recheck all connections, wiring, and pins since the root cause may not be found at that time
How the code clears
Clearing the code requires cycling power (turning the key switch off and back on) after the repair is completed. No separate clearing step is listed beyond this power cycle.
Affected models and serial ranges
M1507 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 M1507 mean?
It means the gateway controller detected an open circuit on the traction lock relay output, wire 4110. This output is supposed to energize the traction lock relay to enable traction, and when the controller can't confirm the circuit, it disables traction.
Why won't my Bobcat drive when M1507 is active?
Traction is deliberately disabled by the controller whenever this code is set. This is a built-in protective response to a suspected open circuit in the traction lock relay wiring, not a mechanical breakdown.
What is wire 4110 on a Bobcat loader?
Wire 4110 is the traction pull output from the gateway controller. It carries the signal that energizes the traction lock relay when the controller commands traction to be enabled.
How do I clear M1507 after fixing it?
Cycle power by turning the key switch off and back on. That is the only clearing step listed for this code.
What if the M1507 code won't come back during testing?
If the fault is intermittent and not present when you test, the root cause may not be identifiable at that time. Check for loose connections, corrosion, pushed-back pins, the controller, and the wire harness, since any combination of these can cause an intermittent open.
Which Bobcat models can show code M1507?
This code applies to the S510, S530, S550, S570, S590, S630, S650, S750, S770, T550, T590, T630, T650, T750, and T770 and T870 skid steer and track loader models.
Is M1507 the same as panel code 15-07?
Yes, 15-07 is the numeric panel display form of the same fault, M1507, Traction Lock Pull Output Open Circuit.