The P0605 trouble code indicates an error with the Internal Control Module Read Only Memory (ROM). The ROM is a type of computer memory used by the Powertrain Control Module (PCM) to store critical operating instructions and data that cannot be altered under normal operating conditions. The error occurs when the PCM detects a fault in the ROM.
Internal Control Module Read Only Memory (ROM) Error
Code symptoms P0605.
1. Check Engine Light illuminated.
2. Vehicle may experience drivability issues such as rough idle, hesitation, or poor acceleration.
3. Stored codes related to other systems or components, as the ROM error can affect various vehicle functions.
4. Loss of critical operating instructions stored in ROM, resulting in improper operation of engine and transmission systems.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0605.
1. Faulty PCM.
2. Electrical issues such as power surges or voltage spikes.
3. Power interruption during PCM programming or battery replacement.
4. Physical damage to the PCM or its connectors.
5. Faulty sensors or components causing incorrect data to be stored in ROM.
Code Solutions P0605.
1. Clear the trouble codes and see if the P0605 code returns. Sometimes, the code may be triggered by a temporary issue.
2. Check the vehicle battery and charging system to ensure proper voltage levels. Replace the battery if it is weak or dead.
3. Inspect battery terminals and connections for corrosion or looseness. Clean or tighten connections as necessary.
4. If the battery or PCM has been recently replaced, ensure that the PCM was properly programmed and that there were no interruptions during the programming process.
5. Perform a PCM reset procedure as outlined in the vehicle’s service manual to clear the ROM error and allow the PCM to reinitialize.
6. If the problem persists, it may indicate a faulty PCM that needs to be replaced. Consult a qualified technician for further diagnosis and repair.