Error code

OBD2 P0605

OBD2P0605
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Internal Control Module Read Only Memory (ROM) Error.

Severity

highCan be driven, but performance issues and potential safety concerns may arise.

Summary

P0605 indicates an internal control module read-only memory (ROM) error in the engine control module (ECM). This means the ECM has lost its ability to monitor and adjust other control modules, potentially affecting vehicle performance.

Symptoms

  • Check engine light is on
  • Decreased fuel economy
  • Harsh shifting or transmission hesitation
  • Poor acceleration, rough idle, or stalling
  • Anti-lock brake system not activating properly
  • Optional features like cruise control or turbocharger malfunctioning

Common Causes

  • Loose connection or defective wiring harness
  • Corrosion on exposed modules
  • Ground issues due to loose ground straps or damaged mounting bolts
  • Stored error codes interfering with normal operation
  • Internal failure of the ECM or control module

Diagnosis

  1. Inspect the PCM for physical damage
  2. Check power input to the PCM
  3. Inspect wiring and connections
  4. Look up tech bulletins for software updates
  5. Flash the PCM if recommended
  6. Ensure proper grounding of the control module

Fixes

  • Replace faulty ECM or control module

FAQ

What does P0605 mean?

P0605 indicates an internal error in the engine control module's read-only memory, affecting its ability to monitor and adjust other vehicle systems.

How do I fix a P0605 code?

Fixing P0605 typically involves inspecting and repairing wiring issues, ensuring proper grounding, or replacing the faulty ECM or control module.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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