What Does P1586 Mean?
This code indicates the throttle control unit has detected that the throttle position does not match the commanded position. The electronic throttle body is unable to achieve or maintain the target throttle angle requested by the PCM, indicating a mechanical or electrical issue with the throttle actuator system. The vehicle will likely enter a failsafe reduced power mode.
Safety Warning
Reduced power mode limits vehicle performance. If the throttle sticks open or fails to return to idle, it could result in unintended acceleration. Prompt repair is essential.
Common Causes
30%
Carbon-fouled throttle body causing blade sticking or binding
25%
Failed electronic throttle body motor
20%
Throttle position sensor calibration drift or failure within the throttle body
15%
Wiring or connector fault in the throttle actuator circuit
10%
Broken or weakened throttle blade return spring
Diagnostic Steps
1
With the engine off and key on, command the throttle actuator through its range using a scan tool bi-directional test; observe if movement is smooth or jerky.
2
Remove the intake ducting and visually inspect the throttle blade for carbon buildup, debris, or mechanical damage.
3
Check the throttle body connector for corrosion, backed-out pins, or water intrusion.
4
Measure throttle motor resistance and TPS sensor voltages at the throttle body connector; compare to service manual specifications.
5
Clean the throttle body thoroughly with approved cleaner if carbon buildup is found; if the motor or sensors are faulty, replace the throttle body assembly.
6
Perform the throttle body relearn procedure after service, clear codes, and road test under various load conditions.
Estimated Repair Cost
$200 - $650
Parts + labor, varies by vehicle and location
This code indicates the throttle control unit has detected that the throttle position does not match the commanded position. The electronic throttle body is unable to achieve or maintain the target throttle angle requested by the PCM, indicating a mechanical or electrical issue with the throttle act...
The most common cause of P1586 (Throttle Control Unit Throttle Position Malfunction) is: Carbon-fouled throttle body causing blade sticking or binding
Typical repair costs for P1586 range from $200 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced power mode limits vehicle performance. If the throttle sticks open or fails to return to idle, it could result in unintended acceleration. Prompt repair is essential.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1586 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
