Here's a breakdown of the potential causes and why professional help is recommended:
* Faulty ABS Module (Pump/Control Unit): This is the most likely culprit. The module itself may have internal electrical shorts or failures causing the pump to run continuously. Replacement is often the only solution, and these modules can be expensive.
* Wiring Issues: A short circuit or damaged wire in the ABS system's wiring harness could be sending a constant signal to the pump, even with the ignition off. Tracing and repairing wiring requires specialized knowledge and tools.
* Low Battery Voltage: While less likely to cause *continuous* running, a very low battery could potentially confuse the ABS module. Check your battery voltage. If it's low, charge it, but this probably won't solve the constant running pump.
* Wheel Speed Sensor Issues (Less Likely): While a faulty wheel speed sensor wouldn't directly *cause* the pump to run continuously, it could trigger an error that leads to the module attempting to compensate, potentially causing prolonged activation.
* Brake Switch: While unlikely to keep the pump running constantly *after* the key is removed, a faulty brake switch could contribute to issues within the ABS system.
Why professional help is crucial:
* Safety: Working on the ABS system involves high voltages and potentially dangerous components. Incorrect procedures can lead to electrical shock or injury.
* Diagnosis: Pinpointing the exact cause requires specialized diagnostic tools that can read ABS system codes and monitor sensor inputs. A standard OBD-II scanner won't be sufficient.
* Complexity: The ABS system is complex and interconnected with other vehicle systems. Improper repairs can cascade into more serious problems.
What you should do:
1. Disconnect the Battery: This is the immediate safety precaution to prevent further damage and potential battery drain. Disconnect both the positive (+) and negative (-) terminals.
2. Have it Professionally Diagnosed: Take your Durango to a qualified mechanic specializing in automotive electrical systems or a reputable repair shop with ABS diagnostic capabilities. They will use a scan tool to read the ABS system codes, which will help them pinpoint the problem.
3. Get a Repair Estimate: Once the diagnosis is complete, get a written estimate for repairs before proceeding.
Ignoring this problem will likely lead to further damage, a drained battery, and potentially dangerous driving conditions. Professional diagnosis and repair are absolutely necessary.
