What Does P1639 Mean?
The electronic throttle control system has detected that the throttle blade is mechanically stuck and unable to move to commanded positions. This is a permanent mechanical failure requiring immediate attention.
Safety Warning
Vehicle will enter limp mode with severely restricted power or may fail to start. If failure occurs while driving, sudden loss of power could cause dangerous situations.
Common Causes
35%
Severe carbon buildup causing throttle blade to seize in bore
30%
Throttle body motor failure or internal gear damage preventing movement
15%
Physical damage to throttle blade or bore from foreign object ingestion
12%
Throttle shaft bearings seized or broken preventing rotation
8%
Severe corrosion or cold-weather ice preventing throttle blade movement
Diagnostic Steps
1
Step 1: Remove air intake duct and attempt to manually move throttle blade - check for complete seizure or severe binding
2
Step 2: Visually inspect for physical damage, severe carbon deposits, or foreign objects preventing throttle movement
3
Step 3: Attempt to clean throttle body if carbon is the issue, but be prepared for throttle body replacement
4
Step 4: Use scan tool to command throttle movement with key on, engine off - monitor for any response
5
Step 5: Replace throttle body assembly if cleaning does not restore free movement, then perform adaptation procedure
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The electronic throttle control system has detected that the throttle blade is mechanically stuck and unable to move to commanded positions. This is a permanent mechanical failure requiring immediate attention.
The most common cause of P1639 (Throttle Valve Position Control; Throttle Stuck Permanently) is: Severe carbon buildup causing throttle blade to seize in bore
Typical repair costs for P1639 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will enter limp mode with severely restricted power or may fail to start. If failure occurs while driving, sudden loss of power could cause dangerous situations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1639 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Manufacturer
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