The Lexus P1605 code is an engine fault code that is triggered when the powertrain control module (PCM) detects a problem in the knock control portion of the controller during the test period. This code is a warning signal that means the engine has started and is running, but the PCM has identified a malfunction. Understanding the cause and solution of this code is critical for the proper repair and maintenance of the vehicle. In this article, we will discuss the causes and solutions of the Lexus P1605 code to help you pinpoint the issue and take the necessary steps to get your vehicle back up and running.
Causes and Solutions of the Lexus P1605 Code
| Causes | Solutions |
|---|---|
| The PCM is detecting a malfunction in the Knock Control Portion | Erase the codes and determine if it resets. If the same trouble code (P1605) returns, replace the PCM. |
| TSB TC002-03 (6/03) may be related to this code | Consult the Technical Service Bulletin for further information. |
| The PCM has failed | Replace the PCM. |
| The engine is running rough | Perform a test drive and inspect the engine for any other issues. |
The PCM Is Detecting a Malfunction in the Knock Control Portion
The Lexus P1605 code is triggered when the powertrain control module (PCM) detects a problem in the knock control portion of the controller during the test period. This code is an indication that the engine has started and is running, but the PCM has identified a malfunction. The first step in diagnosing this issue is to erase the codes and determine if it resets. If the same trouble code (P1605) returns, it is an indication that the PCM has failed and needs to be replaced.
TSB TC002-03 (6/03) May Be Related to This Code
There is a Technical Service Bulletin (TSB) TC002-03 (6/03) that may be related to this code. This TSB covers the replacement of the PCM. It is recommended that you consult the TSB for further information.
The Engine Is Running Rough
If the engine is running rough, it is likely that there are other issues that need to be addressed. It is recommended that you perform a test drive and inspect the engine for any other issues that may be causing the rough running.
Conclusion
The Lexus P1605 code is a warning signal that the powertrain control module (PCM) has detected a problem in the knock control portion of the controller. This code can be caused by the PCM failing, or there may be other issues that need to be addressed. To properly diagnose and repair the issue, it is important to consult the Technical Service Bulletin (TSB) TC002-03 (6/03) for further information. Taking the steps to properly diagnose and repair the Lexus P1605 Code will ensure that your vehicle is up and running correctly and safely.
https://www.youtube.com/watch?v=8roRGnCb5eA