Bobcat M2502 (25-02) Fault Code: Traction Lock Pull Relay Error On
Also shown on the panel as 25-02 · Also called Traction Pull Relay Error On
Traction Lock Pull Relay Error On · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
M2502 (panel code 25-02) sets when the gateway controller sees voltage on the traction lock relay feedback wire (3430 or 4150 depending on model) for 5 seconds when the relay was not commanded on. It points to a short to supply voltage on the traction lock pull solenoid or feedback circuit, a stuck or failed traction lock relay, or a gateway controller fault.
Medium severity. This code affects the traction lock circuit, which is tied to machine travel control. It will not strand the machine on the spot, but it should be diagnosed before continued operation since an unintended relay-on state can affect how traction locks behave when the operator does not expect it.
What does Bobcat error code M2502 mean?
Code M2502 (shown on the panel as 25-02) is logged by the gateway controller when it detects voltage present on the traction lock relay feedback wire, either wire 3430 or wire 4150 depending on the machine's wiring configuration, for 5 seconds while the controller has not commanded that relay on. In plain terms, the controller expects the relay to be off, but its feedback signal says voltage is there anyway.
The traction lock relay and its pull solenoid are part of the circuit that controls whether the machine's traction lock function is engaged. When the feedback circuit reports voltage that should not be present, the controller cannot trust the actual state of the relay, so it flags the fault to alert the operator and technician that the traction lock control circuit is not behaving as commanded.
Both feedback wire variants (3430 and 4150) are treated the same way by the controller logic. Which wire number applies depends on the specific model and harness configuration, but the fault meaning and diagnostic approach are identical either way.
What triggers a Bobcat M2502 code?
The gateway controller sets M2502 when it detects voltage for 5 seconds on the traction lock relay feedback wire (3430 or 4150) while the relay has not been commanded on. This condition is checked whenever the key switch or run/enter switch is on.
Common causes of M2502
- Traction lock pull solenoid wire 4100, or the feedback wire (3430 or 4150), shorted to supply voltage.
- A failed or stuck traction lock relay that is passing voltage to the feedback wire even when not commanded.
- A fault in the gateway controller itself.
- Moisture, corrosion, or pushed-back pins in the gateway controller connectors, the traction lock relay connectors, or the mainframe harness.
- An intermittent condition from loose connections, corrosion, pushed-back pins, the controller, the wire harness, or a combination of these problems, which may not be found if the code is not actively present at the time of testing.
How to troubleshoot Bobcat M2502: first checks
- Confirm the key switch or run/enter switch is on, since that is the condition required for the controller to check for this fault.
- Inspect the gateway controller connectors and the traction lock relay connectors for moisture, corrosion, or pins that have been pushed back out of place.
- Check wire 4100 (traction lock pull solenoid) and the feedback wire (3430 or 4150, depending on your model) for signs of chafing, pinching, or contact with a supply voltage source that could cause an unintended short.
- Test the traction lock relay itself for proper operation, since a relay that is stuck or internally shorted can send feedback voltage even when not commanded.
- Inspect the mainframe harness along the run to the traction lock relay and gateway controller for damage, corrosion, or loose connections.
- If the fault is not currently active, treat it as intermittent and recheck all connectors, pins, and harness sections listed above, since intermittent faults may not show a findable cause on a single inspection.
How the code clears
Clearing M2502 requires cycling power to the machine after the repair is complete. No separate reset procedure is listed for this code beyond a power cycle.
Affected models and serial ranges
M2502 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 M2502 mean?
It means the gateway controller detected voltage on the traction lock relay feedback wire for 5 seconds when that relay was not commanded to be on. The panel will show this as code 25-02.
Which wire is involved in code M2502?
Depending on the model, the feedback wire is either wire 3430 or wire 4150. The traction lock pull solenoid wire, 4100, is also part of the circuit and can cause the fault if shorted to supply voltage.
Is it safe to keep operating with code M2502 active?
The traction lock circuit is part of travel control, so a fault here should be diagnosed before continued operation. It is a medium severity issue rather than an immediate shutdown, but it should not be ignored.
How do I clear code M2502 after repair?
Cycle power to the machine. No other reset procedure is listed for this code.
Why does M2502 come back intermittently?
Intermittent occurrences are often caused by loose connections, corrosion, or pushed-back pins in the gateway controller or traction lock relay connectors, or in the mainframe harness. If the fault is not active during testing, the root cause may not be found on that inspection.
Which Bobcat models can show code M2502?
This code applies across a wide range of Bobcat skid steer and track loader models, including the S510, S530, S550, S570, S590, S630, S650, S750, S770, and the T550, T590, T630, T650, T750, T770, T870.
What is the traction lock relay for?
It controls the traction lock pull solenoid circuit that manages the traction lock function on the machine. When the relay's feedback signal does not match what the controller commanded, the gateway controller cannot verify the relay's real state, which triggers this fault.