What Does P1579 Mean?
The throttle position adaptation learning process has not been initiated or completed. This adaptation allows the PCM to learn the minimum and maximum throttle positions for proper idle speed control.
Common Causes
35%
Throttle body adaptation procedure not performed after cleaning or replacement
30%
Recent battery disconnection clearing adaptive values without relearning
20%
Carbon buildup on throttle plate preventing proper closing position
10%
Faulty throttle position sensor preventing accurate position learning
5%
PCM software issue or corrupted adaptation memory
Diagnostic Steps
1
Step 1: Verify throttle body is clean and moves freely through full range without binding
2
Step 2: Check throttle position sensor values at idle and wide-open throttle using scan tool - verify they are within normal range
3
Step 3: Perform throttle adaptation procedure per manufacturer specifications (typically key on/off cycles with specific pedal positions)
4
Step 4: If adaptation fails, inspect throttle body for excessive carbon buildup and clean if necessary
5
Step 5: Clear code and test drive, monitor idle quality and throttle response to confirm adaptation completed
Estimated Repair Cost
$50 - $300
Parts + labor, varies by vehicle and location
The throttle position adaptation learning process has not been initiated or completed. This adaptation allows the PCM to learn the minimum and maximum throttle positions for proper idle speed control.
The most common cause of P1579 (Idle Speed Contr.Throttle Pos. Adaptation not started) is: Throttle body adaptation procedure not performed after cleaning or replacement
Typical repair costs for P1579 range from $50 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may have rough idle, stalling at stops, or inconsistent idle speed. Not a safety risk during normal operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1579 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control / Idle Control System
Difficulty
Type
Manufacturer
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