P0605 – Audi DTC

Audi DTC P0605 – Lack of proper voltage and/or ground to the PCM, Defective PCM ROM memory module, Defective PCM ground circuit(s), Defective PCM controlled output devices

DTC P0605 meaning on Audi

DTC P0605 indicates a problem with the Powertrain Control Module (PCM) in an Audi vehicle. This code specifically points to an issue with the PCM’s Read-Only Memory (ROM) module. The PCM is responsible for managing various engine and transmission functions, and any faults in its operation can lead to performance issues.

Audi DTC P0605 symptoms

Common symptoms associated with DTC P0605 may include:

• Check Engine Light illuminated
• Engine performance issues
• Stalling or rough idling
• Increased fuel consumption
• Failure to start

Audi DTC P0605 causes

Several factors can lead to the triggering of DTC P0605, including:

• Lack of proper voltage and/or ground to the PCM
• Defective PCM ROM memory module
• Defective PCM ground circuit(s)
• Defective PCM controlled output devices

Audi DTC P0605 seriousness

DTC P0605 is considered a serious issue as it can affect the overall performance and drivability of the vehicle. If left unaddressed, it may lead to further complications, including engine damage or failure. It is advisable to diagnose and repair the issue promptly to ensure safe operation.

How to diagnose DTC P0605 on Audi

To diagnose DTC P0605, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC P0605.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the PCM connectors and wiring for damage or corrosion.
4. Test the voltage and ground at the PCM to ensure proper supply.
5. Check the PCM ROM memory module for faults.
6. Examine the ground circuits for continuity and integrity.
7. Test the PCM controlled output devices for proper operation.

How to fix DTC P0605 on Audi step-by-step instructions

To fix DTC P0605, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the PCM.
2. Ensure that the PCM is receiving proper voltage and ground.
3. If the PCM ROM memory module is defective, consider replacing the PCM.
4. Check and repair any faulty ground circuits.
5. Test and replace any defective PCM controlled output devices.
6. Clear the DTC using an OBD-II scanner and perform a test drive to verify the fix.

How to erase DTC P0605 on Audi

To erase DTC P0605, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition to the “On” position without starting the engine.
3. Access the trouble codes menu on the scanner.
4. Select the option to clear or erase the codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to check if the code reappears.

Recommended tools for Audi diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.