Cummins ISX-12 CM2250 ECM Repair and Rebuild
🛠️ Repair Notes
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We repair CM2250 ECMs by identifying and replacing damaged internal components, especially failed drivers and power circuits.
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Turnaround time: Typically 4 business days.
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Engine Compatibility: Cummins ISX12 / ISX15 (EPA 2010 compliant)
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ECM Model: CM2250
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Production Years: Approx. 2010 – 2013
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OEM Part Numbers (examples):
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4993120
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4993971
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4993121
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4993125
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4993122
(Check the ECM label for exact part number)
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⚠️ Most Common CM2250 ECM Failures
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Injector Driver Failure
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Common issue with MOSFETs burning out.
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Symptoms: Injector open/short circuit codes.
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Fault codes: SPN 157 / FMI 18
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Turbo Actuator Communication Loss
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Loss of communication between ECM and VGT actuator.
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Fault codes: SPN 2791 / FMI 9 or 11
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CAN Communication Errors (SAE J1939 Network)
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ECM fails to communicate with other modules (e.g., ABS, TCM).
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Fault code: SPN 639 / FMI 2
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No Crank / No Start Condition
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ECM fails to energize starter due to internal circuit failure or power loss.
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Check ECM connector pins (e.g., Pin 55 and 72 on C1 for power).
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Fuel Pressure Sensor Circuit Issues
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ECM receives incorrect or fixed voltage from fuel pressure sensor.
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No Communication / Dead ECM
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ECM completely unresponsive – tools like Cummins INSITE or CalTerm cannot connect.
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Often caused by internal voltage regulator or corrupted software.
📊 Technical Details
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Connector Layout:
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C1: Power supply & sensor inputs
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C2: Injector & actuator outputs
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C3: CAN & diagnostics
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Programming Info:
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Requires Cummins INSITE or CalTerm for calibration.
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ECMs must be programmed or cloned (hardware + software) to match the vehicle.
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contact@unitechelectronics.ca
+1(888)405-7730