Case IH 3245 (DTC E51D) - ECU – Engine Control Unit (ECU): ECU internal failure - Query/response communication errors

The Electronic Control Unit (ECU) A-095 is monitoring communication between itself and the power stage controller over the Serial Peripheral Interface (SPI) bus. If no response or an erroneous response is detected, the A-095 will reset and attempt to monitor the connection again seven times. If the error is still detected after these attempts, the fault code is logged.

• MAXXUM T4E
• Puma Series Tractors: 130, 145, 160, 165, 170, 180, 185, 195, 210, 215, 225, 230, 240
• Magnum Series Tractors: 180, 190, 210, 225, 235, 250, 280, 290, 310, 315, 340, 370, 380
• Steiger & Quadtrac Series: 350, 400, 450, 470, 500, 540, 550, 580, 600, 620
• Axial-Flow Combines: 240 Series, 7120, 7230, 8120, 8230, 9120, 9230

1. 1

   Verify if an external power supply is connected improperly

2. 2

   Check for a faulty charging system (alternator/voltage regulator issues)

3. 3

   Inspect for a faulty solenoid on the circuit

4. 4

   Inspect the wire harness for shorts, breaks, or poor pin connections at the ECU

5. 5

   Check for a faulty Central Control Unit (CCU) or Universal Control Module (UCM) that may be disrupting network traffic

1. 1

   Verify the Fault

   Connect the Case IH Electronic Service Tool (EST) to verify if the fault is currently present and active.

2. 2

   Inspect Power and Ground

   Test the charging system and battery voltage. Ensure no external power supplies are causing voltage spikes.

3. 3

   Harness Check

   Disconnect the ECU A-095 connectors and inspect the pins for corrosion, pushed-back pins, or moisture. Ohm-test the SPI bus communication lines between the ECU and the power stage controller.

4. 4

   Software Reset

   If the wiring and power supply are intact, use the EST to attempt a software reset/reinstallation on the A-095 ECU. During a software reset, dashboard lights may flash and gauges may temporarily drop to zero.

5. 5

   Replace the ECU

   If the ECU A-095 cannot be reinstalled, or if the internal SPI communication failure persists after a software flash, the ECU A-095 has suffered a hard internal failure and must be replaced.