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Generic trouble codes like the code P0606 apply to most cars that come with on-board diagnostics (OBD). When this code appears on the code reader or scanner, among the first questions most people tend to ask themselves is, “What is the P0606 code?” Read on to find out more about this code, its symptoms, and causes.

What Does the P0606 Code Mean?

Diagnostic Trouble Code (DTC) P0606 stands for “Control Module Processor.” It is a non-specific, generic powertrain DTC indicating that there’s an error being detected in the powertrain control module (PCM).

The primary job of the PCM is to control certain aspects of the engine and transmission. Sensors provide input data to the PCM, then the module uses that data to control a variety of output, ranging from the fuel injectors to the transmission shift solenoids.

engine control module
Code P0606 indicates that there’s an error detected in the PCM.

Furthermore, the PCM monitors the sensors, circuits, and devices it interacts with. The module also monitors itself for internal faults and may set code P0606 if it detects an internal error.

Note: The definition of code P0606 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

Users have reported p0606 for the following makes: Toyota (especially on a Toyota RAV4), Ford, Chevrolet, GMC, and Peugeot.

What are the Possible Causes of the P0606 Code?

Knowing what’s causing the PCM to fail could help you with troubleshooting. Keep in mind, however, that the causes may vary depending on vehicle model, make, and year. Here are the common causes of PCM processor failure or code P0606:

  • Bad PCM
  • An issue with the PCM power or ground circuit
  • PCM software in need of an update

What are the Possible Symptoms of the P0606 Code?

Code P0606 can cause driveability and engine efficiency issues. You could face one or more of these symptoms if you’re running with a P0606 code:

  • Check engine light is on
  • Engine will not start
  • Multiple engine drivability issues
  • Problems with the automatic transmission’s performance
  • Other issues involving the ABS, TCS, IPC, or BCM
automatic transmission
You may experience issues with your automatic transmission’s performance if you’re running with a P0606 code.

How to Diagnose the P0606 Code

Diagnosing the P0606 code can be challenging, so it may be best to leave that task to your mechanic. If you do decide to do the task yourself, you’ll need the help of a detailed guide to help you do the diagnosis properly.

How to Fix the P0606 Code

Fixing the P0606 code might be tricky since there’s no single solution. You’ll probably be better off leaving the fixing to your mechanic.

You can try to do it yourself, however, if you feel confident about your DIY skills. You can refer to online auto repair guides to help you pull off the job. You may also get a single-vehicle ALLDATA subscription, which can be useful for this repair and other future repairs you may have to do on your car. Always remember that what works for one particular model may not work for other models.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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