What Does P2108 Mean?
The PCM has detected a performance issue with the throttle actuator control module operation. The system is functioning but not meeting expected response times or accuracy standards.
Common Causes
35%
Carbon buildup on throttle blade causing sluggish actuator response
30%
Weak or failing throttle actuator motor with reduced torque output
15%
Low battery voltage or weak alternator causing inadequate motor power
12%
Worn throttle blade shaft bushings causing excessive friction
8%
PCM software calibration issue affecting throttle control algorithms
Diagnostic Steps
1
Step 1: Remove throttle body and inspect for carbon deposits on blade and bore; clean with throttle body cleaner if contaminated
2
Step 2: With throttle body removed, manually rotate throttle blade through full range; should move smoothly without binding or excessive play
3
Step 3: Test battery and charging system; verify battery has adequate cold cranking amps and alternator output meets specifications
4
Step 4: Monitor throttle actuator command vs. actual position with scan tool during rapid throttle changes; look for lag or overshoot
5
Step 5: Perform throttle relearn procedure per manufacturer specifications after cleaning or check for available PCM software updates
Estimated Repair Cost
$100 - $750
Parts + labor, varies by vehicle and location
The PCM has detected a performance issue with the throttle actuator control module operation. The system is functioning but not meeting expected response times or accuracy standards.
The most common cause of P2108 (Throttle Actuator Control Module Performance) is: Carbon buildup on throttle blade causing sluggish actuator response
Typical repair costs for P2108 range from $100 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience delayed throttle response, rough idle, or hesitation during acceleration. Generally drivable but performance and drivability are compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2108 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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