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Home / DTC / P0607 — Engine ECU

P0607 — Engine ECU

Detailed page for trouble code P0607.

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Code

P0607

MITSUBISHI P — Powertrain

Engine ECU

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or failing Engine Control Module (ECM/ECU)
  • Low or intermittent battery voltage / poor charging system
  • Poor power supply or ground to the ECM (loose connector, corroded pin)
  • Blown fuse or faulty power/ignition relay feeding the ECM
  • Damaged wiring harness or short to voltage/ground on ECM power or communication lines
  • Corrupted firmware or failed software update

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • No communication with ECM or intermittent response in scan tool
  • Engine may not start, or may crank but not run properly
  • Poor drivability: stalling, rough idle, misfire, limp-home behavior
  • Stored additional communication or sensor-related trouble codes
  • Certain vehicle functions controlled by ECM may be disabled

What to check

  • Scan for stored and pending codes; record freeze-frame data and related codes
  • Verify battery voltage at rest, key-on and during cranking (should be ~11–14.5 V)
  • Inspect ECM power & ground fuses and relays for continuity and proper operation
  • Visually inspect ECM connector for corrosion, bent pins, water damage, or loose locking tab
  • Back-probe ECM power and ground pins to confirm solid voltage and good ground
  • Check CAN/LIN network connectivity and measure bus voltages for proper idle values

Signal parameters

  • Battery/ECM supply voltage (key-on): approx. 11–14.5 V
  • Cranking voltage: typically >9.5 V (varies by vehicle)
  • ECM ground: near 0 V with low resistance to chassis ground
  • CAN bus idle voltage (each line): approximately 2.5 V (differential ~0 V idle, dominant ~±2 V during activity)
  • Serial communication: expected stable response when queried by a scan tool; timeouts indicate communication fault

Diagnostic algorithm

  1. Retrieve and record all DTCs and freeze-frame data. Note related codes that may identify power/comm faults.
  2. Verify battery condition and charging system; charge battery or perform load test if needed.
  3. With key ON, check ECM primary power feed fuse(s) and relays for continuity and voltage at the ECM power pin(s).
  4. Measure and verify good ground(s) at the ECM; clean and secure ground connections as needed.
  5. Inspect ECM connector and harness for corrosion, bent pins, water intrusion, or damage; repair as required.
  6. Use a scan tool to check ECM communication, live data, and perform an ECM self-test. Note timeouts or intermittent connections.
  7. Probe CAN/LIN communication lines with scope or DMM to confirm idle voltages and signal integrity; repair bus faults.
  8. If wiring, power and grounds are good and communication still fails, attempt to re-flash or update ECM software per manufacturer procedure.
  9. If reflash fails or internal ECM faults persist after eliminating external causes, arrange ECM replacement and program/configure per factory instructions.
  10. After any repair or replacement, clear codes and verify proper operation and that P0607 does not return.

Likely causes

  • Defective ECM hardware (internal processor or memory failure)
  • Missing or unstable battery voltage at ECM during key-on/crank
  • Poor ground connection at chassis/engine ground strap
  • Open or high-resistance power fuse/relay for ECU
  • Faulty CAN transceiver or shorted CAN bus wiring causing communication errors
  • ECM software corruption after failed reflash or update

Fault status

⚠️ Status
ECU internal performance fault detected. MIL illuminated. Possible memory, processor, power, or communication error preventing normal ECM operation.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4.0 hours

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406

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