Error Code P1582 is defined as Idle Adaptation at Limit.

This error code is a manufacturer-specific trouble code, meaning it does not apply to all vehicles makes. Rather, it applies only to specific vehicle makes, such as Volkswagen, etc. Specification on the definition, troubleshooting, and repairs still vary from one make and model to another.


Error Code P1582 is triggered by the PCM (powertrain control module, also known as ECM or engine control module, and ECU or engine control unit in other vehicle makes) as it tries to push the motor to let more air get inside the engine. When it reaches its maximum level of push it can deliver, the PCM will activate the Check Engine light to indicate that idle adaptation is at its limit.

Common Symptoms

As with other error codes, this code activates the Check Engine light and registers the code to the system.

Possible Causes

There are more than a couple of reasons that commonly trigger this code, such as:

  • Diluted crankcase
  • Fuel injector is open for too long
  • High blowby in the engine
  • Malfunctioning throttle

How to Check

To diagnose this code, you have to check the possible causes stated above. A dirty engine, for example, causes a diluted crankcase.

Check the fuel injectors for signs of wear and tear. If they’re worn out, then they need replacing.

If neither above is bad, then it may be a case of blowby engine. Check the compression ratio if they’re within range. If they’re not, then you have a case of malfunctioning throttle valve control.

How to Fix

Typical repairs, of course, depend on the diagnosis.

For diluted crankcase, you must change the oil and take the vehicle for a drive.

For fuel injector that is open for too long, changing oil will definitely NOT fix the problem. Thus, you need to replace the fuel injectors.

If the code resulted from high blowby in the engine, and the engine’s compression ratio is out of range, then you need to replace the throttle valve control.

After replace oil and parts, clear the codes by disconnecting the PCM for 10 seconds. This will clear the memory off of the trouble code and make a readiness code.

This is code usually caused by a dirty engine or dirty engine oil, which means the throttle body must be replaced.