P0605 Fault Code

P0605 OBD-II Trouble Code Short Description

Internal Control Module Read Only Memory (ROM) Error (Module Identification Defined by SAE J1979)

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What does trouble code P0605 mean?

The P0605 fault code indicates that there is an issue with the Internal Control Module Read Only Memory (ROM). This diagnostic trouble code is set when the engine control module (ECM) detects a malfunction in the ROM functionality. It signifies that the module is unable to correctly read its programmed memory, which is critical for the proper functioning of various engine parameters and settings.

Symptoms

What are the symptoms of the P0605 code?

Drivers may experience symptoms such as:

  • Engine performance issues, including stalling or rough idling.
  • Poor fuel economy due to improper engine management.
  • Warning lights illuminated on the dashboard, especially the check engine light.
  • Inability to start the vehicle or delay in starting.
  • Possible fluctuations in engine power and responsiveness during acceleration.

Causes

What causes the P0605 code?

Common causes of a P0605 code include:

  • Failure or corruption of the control module's ROM.
  • Poor electrical connections or wiring harness issues.
  • Short circuits or open circuits in the module's circuitry.
  • Intermittent faults due to temperature fluctuations.
  • Software errors or outdated firmware in the ECM.
  • External factors such as voltage spikes or electrical surges.

Possible Solutions

How to fix P0605?

To resolve a P0605 code, the following steps can be taken:

  • Start by inspecting the wiring and connectors related to the ECM for any signs of damage, corrosion, or loose connections.
  • If the connections are intact, consider reprogramming or updating the ECM firmware, as software issues can sometimes trigger this code.
  • In cases where the ROM is deemed faulty, replacing the engine control module may be necessary.
  • Clear the fault code from the vehicle's computer and conduct test drives to check if the code returns. Make sure to analyze other related trouble codes as they may assist in diagnosing the problem comprehensively.
P0605 Internal Control Module Read Only Memory (ROM) Error (Module Identification Defined by SAE J1979)